diff --git a/Assignment 2-2020.Rmd b/Assignment 2-2020.Rmd index 0b235a3..4514bca 100644 --- a/Assignment 2-2020.Rmd +++ b/Assignment 2-2020.Rmd @@ -29,6 +29,7 @@ D1 <- read.csv("video-data.csv", header = TRUE) #Create a data frame that only contains the years 2018 D2 <- filter(D1, year == 2018) +D2 ``` ## Histograms @@ -63,10 +64,10 @@ y <- c(2,4,2,3,2,4,3) #Create a table from x & y table1 <- table(x,y) - +table1 #Display the table as a Barplot barplot(table1) - +table1 #Create a data frame of the average total key points for each year and plot the two against each other as a lines D3 <- D1 %>% group_by(year) %>% summarise(mean_key = mean(key.points)) @@ -91,26 +92,40 @@ pairs(D5) 1. Create a simulated data set containing 100 students, each with a score from 1-100 representing performance in an educational game. The scores should tend to cluster around 75. Also, each student should be given a classification that reflects one of four interest groups: sport, music, nature, literature. ```{r} -#rnorm(100, 75, 15) creates a random sample with a mean of 75 and standard deviation of 20 +#rnorm(100, 75, 15) creates a random sample with a mean of 75 and standard deviation of 15 #pmax sets a maximum value, pmin sets a minimum value #round rounds numbers to whole number values #sample draws a random samples from the groups vector according to a uniform distribution +score <- rnorm(100, 75, 15) +hist(score, breaks = 30) +s1 <- data.frame(score) +s1 + +library(dplyr) +s1 <- filter(s1, score <= 100) +hist(s1$score) +s2 <- data.frame(rep(100, 100-NROW(s1))) +names(s2) <- "score" -``` +s3 <- bind_rows(s1, s2) +s3$studentid <- seq(1, 100, 1) +s3$score <- round(s3$score) +interest <- c("sport", "music","nature", "literature") +s3$interest <- sample(interest, 100, replace = TRUE) +s3 +``` 2. Using base R commands, draw a histogram of the scores. Change the breaks in your histogram until you think they best represent your data. ```{r} - +hist(s3$score, breaks = 10, ylim = c(0, 30)) ``` - - 3. Create a new variable that groups the scores according to the breaks in your histogram. ```{r} #cut() divides the range of scores into intervals and codes the values in scores according to which interval they fall. We use a vector called `letters` as the labels, `letters` is a vector made up of the letters of the alphabet. - +s3$lables <- cut(s3$score, breaks = 10, labels = letters[1:10]) ``` 4. Now using the colorbrewer package (RColorBrewer; http://colorbrewer2.org/#type=sequential&scheme=BuGn&n=3) design a pallette and assign it to the groups in your data on the histogram. @@ -123,7 +138,8 @@ library(RColorBrewer) #Make RColorBrewer palette available to R and assign to your bins #Use named palette in histogram - +brewer.pal(10, "Set3") +hist(s3$score, breaks = 10 , ylim = c(0, 30), col = brewer.pal(10, "Set3"), border = FALSE) ``` @@ -131,35 +147,37 @@ library(RColorBrewer) ```{r} #Make a vector of the colors from RColorBrewer - +head(s3) +boxplot(score ~ interest, data = s3) +brewer.pal(4, "Pastel1") +display.brewer.pal(4, "Pastel1") +boxplot(score ~ interest, data = s3, col = brewer.pal(4, "Pastel1"), border = "grey") ``` - - 6. Now simulate a new variable that describes the number of logins that students made to the educational game. They should vary from 1-25. ```{r} - +(s3$logins <- sample(1:25, 100, replace = TRUE)) ``` 7. Plot the relationships between logins and scores. Give the plot a title and color the dots according to interest group. ```{r} - - +plot(s3$logins ~ score, data = s3, main = "All About Games", ylab = "logins", pch = 7, col = c("plum2", "mediumturquoise", "darkseagreen1", "lavender")) ``` 8. R contains several inbuilt data sets, one of these in called AirPassengers. Plot a line graph of the the airline passengers over time using this data set. ```{r} - +plot(AirPassengers) ``` -9. Using another inbuilt data set, iris, plot the relationships between all of the variables in the data set. Which of these relationships is it appropraiet to run a correlation on? +9. Using another inbuilt data set, iris, plot the relationships between all of the variables in the data set. Which of these relationships is it appropriate to run a correlation on? ```{r} - +plot(iris) +cor(iris$Petal.Length,iris$Petal.Width) ``` # Part III - Analyzing Swirl @@ -171,7 +189,15 @@ In this repository you will find data describing Swirl activity from the class s ### Instructions 1. Insert a new code block +```{r} + +``` + 2. Create a data frame from the `swirl-data.csv` file called `DF1` +```{r} +DF1 <- read.csv("swirl-data.csv", header = TRUE) +DF1 +``` The variables are: @@ -185,19 +211,52 @@ The variables are: `hash` - anonymyzed student ID 3. Create a new data frame that only includes the variables `hash`, `lesson_name` and `attempt` called `DF2` +```{r} +library(dplyr) +DF2 <- dplyr::select(DF1, hash, lesson_name, attempt) +DF2 +``` 4. Use the `group_by` function to create a data frame that sums all the attempts for each `hash` by each `lesson_name` called `DF3` +```{r} +library(dplyr) +DF3 <- DF2 %>% group_by(hash, lesson_name) %>% summarise(sum = sum(attempt)) +DF3 +``` + 5. On a scrap piece of paper draw what you think `DF3` would look like if all the lesson names were column names +![script](WechatIMG806.jpeg) 6. Convert `DF3` to this format +```{r} +library(tidyr) +script <- spread(DF3, lesson_name, sum, fill = NA, convert = FALSE) +``` + 7. Create a new data frame from `DF1` called `DF4` that only includes the variables `hash`, `lesson_name` and `correct` +```{r} +library(dplyr) +DF4 <- select(DF1, hash, lesson_name, correct) +``` 8. Convert the `correct` variable so that `TRUE` is coded as the **number** `1` and `FALSE` is coded as `0` +```{r} +DF4$correct <- ifelse(DF4$correct == "FALSE", 0, 1) + +``` 9. Create a new data frame called `DF5` that provides a mean score for each student on each course +```{r} +library(dplyr) +course_name <- DF1[,1] +DF5 <- bind_cols(DF4, course_name) +DF5 %>% group_by(hash, ...4) %>% summarise(mean = mean(correct)) + +``` 10. **Extra credit** Convert the `datetime` variable into month-day-year format and create a new data frame (`DF6`) that shows the average correct for each day + Finally use the knitr function to generate an html document from your work. Commit, Push and Pull Request your work back to the main branch of the repository. Make sure you include both the .Rmd file and the .html file. diff --git a/Assignment-2-2020.html b/Assignment-2-2020.html new file mode 100644 index 0000000..c4943ed --- /dev/null +++ b/Assignment-2-2020.html @@ -0,0 +1,18238 @@ + + + + + + + + + + + + + + + +Assignment 2 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
+ + + + + + + +

#Part I

+
+

Data Wrangling

+

In the hackathon a project was proposed to collect data from student video watching, a sample of this data is available in the file video-data.csv.

+

stid = student id year = year student watched video participation = whether or not the student opened the video watch.time = how long the student watched the video for confusion.points = how many times a student rewatched a section of a video key,points = how many times a student skipped or increased the speed of a video

+
#Install the 'tidyverse' package or if that does not work, install the 'dplyr' and 'tidyr' packages.
+
+#Load the package(s) you just installed
+
+library(tidyverse)
+
## ── Attaching packages ──────────────────────────────────────────────────────────────────────────────── tidyverse 1.3.0 ──
+
## ✓ ggplot2 3.3.2     ✓ purrr   0.3.4
+## ✓ tibble  3.0.3     ✓ dplyr   1.0.2
+## ✓ tidyr   1.1.2     ✓ stringr 1.4.0
+## ✓ readr   1.3.1     ✓ forcats 0.5.0
+
## ── Conflicts ─────────────────────────────────────────────────────────────────────────────────── tidyverse_conflicts() ──
+## x dplyr::filter() masks stats::filter()
+## x dplyr::lag()    masks stats::lag()
+
library(tidyr)
+library(dplyr)
+
+D1 <- read.csv("video-data.csv", header = TRUE)
+
+#Create a data frame that only contains the years 2018
+D2 <- filter(D1, year == 2018)
+D2
+
##     stid year video participation watch.time confusion.points key.points
+## 1      1 2018     A             1      16.50                6          6
+## 2      2 2018     A             0       0.00                0          0
+## 3      3 2018     A             1       9.00                4          6
+## 4      4 2018     A             1      20.00                8          5
+## 5      5 2018     A             1      12.00                8          5
+## 6      6 2018     A             1      15.00                5          4
+## 7      7 2018     A             1      24.75               11          5
+## 8      8 2018     A             1      12.00                8          6
+## 9      9 2018     A             1      15.00                5          2
+## 10    10 2018     A             1       0.00                0          5
+## 11    11 2018     A             1      19.25                7          6
+## 12    12 2018     A             1       5.00                4          2
+## 13    13 2018     A             1      16.00                8          2
+## 14    14 2018     A             1       7.50                5          5
+## 15    15 2018     A             1      10.00                8          4
+## 16    16 2018     A             1      25.00               10          5
+## 17    17 2018     A             0       0.00                0          0
+## 18    18 2018     A             1      20.25                9          4
+## 19    19 2018     A             1      12.00                6          5
+## 20    20 2018     A             1      14.00                7          4
+## 21    21 2018     A             0       0.00                0          0
+## 22    22 2018     A             0       0.00                0          0
+## 23    23 2018     A             1       3.00                3          5
+## 24    24 2018     A             0       0.00                0          0
+## 25    25 2018     A             1       8.75                7          4
+## 26    26 2018     A             1       0.00                0          5
+## 27    27 2018     A             1       8.00                4          5
+## 28    28 2018     A             1      10.00                4          5
+## 29    29 2018     A             1      10.00                5          2
+## 30    30 2018     A             1      19.25                7          3
+## 31     1 2018     B             1       6.00                2          5
+## 32     2 2018     B             1      15.00                5          4
+## 33     3 2018     B             1       5.00                2          4
+## 34     4 2018     B             1       0.00                0          5
+## 35     5 2018     B             1       2.00                1          4
+## 36     6 2018     B             1      13.50                6          4
+## 37     7 2018     B             1       7.00                7          4
+## 38     8 2018     B             1       0.00                0          7
+## 39     9 2018     B             0       0.00                0          0
+## 40    10 2018     B             1       0.00                0          5
+## 41    11 2018     B             1      12.00                8          3
+## 42    12 2018     B             0       0.00                0          0
+## 43    13 2018     B             1      30.00               10          3
+## 44    14 2018     B             0       0.00                0          0
+## 45    15 2018     B             1       2.00                1          4
+## 46    16 2018     B             1       5.50                2          3
+## 47    17 2018     B             1       0.00                0          5
+## 48    18 2018     B             1      10.00                4          2
+## 49    19 2018     B             1       6.00                2          3
+## 50    20 2018     B             1       6.00                6          5
+## 51    21 2018     B             1      10.50                6          5
+## 52    22 2018     B             1       6.00                2          3
+## 53    23 2018     B             1       7.50                6          4
+## 54    24 2018     B             1       6.00                3          1
+## 55    25 2018     B             1      15.75                7          6
+## 56    26 2018     B             0       0.00                0          0
+## 57    27 2018     B             0       0.00                0          0
+## 58    28 2018     B             1       3.00                1          5
+## 59    29 2018     B             1       3.00                2          5
+## 60    30 2018     B             1       5.00                5          4
+## 61     1 2018     C             1      24.00                8          4
+## 62     2 2018     C             1       5.25                3          5
+## 63     3 2018     C             1       4.00                4          4
+## 64     4 2018     C             1      13.50                6          5
+## 65     5 2018     C             1       0.00                0          6
+## 66     6 2018     C             1      10.50                6          3
+## 67     7 2018     C             1       2.50                1          6
+## 68     8 2018     C             0       0.00                0          0
+## 69     9 2018     C             1      20.25                9          5
+## 70    10 2018     C             1      10.00                8          5
+## 71    11 2018     C             0       0.00                0          0
+## 72    12 2018     C             1      24.00                8          4
+## 73    13 2018     C             0       0.00                0          0
+## 74    14 2018     C             1      18.00                9          5
+## 75    15 2018     C             1       4.00                2          4
+## 76    16 2018     C             1      12.00                4          3
+## 77    17 2018     C             1       0.00                0          3
+## 78    18 2018     C             1      12.00                6          4
+## 79    19 2018     C             0       0.00                0          0
+## 80    20 2018     C             1      16.50                6          4
+## 81    21 2018     C             1       2.50                1          4
+## 82    22 2018     C             1      27.00                9          4
+## 83    23 2018     C             0       0.00                0          0
+## 84    24 2018     C             1      11.25                9          5
+## 85    25 2018     C             1       0.00                0          4
+## 86    26 2018     C             0       0.00                0          0
+## 87    27 2018     C             1      25.00               10          3
+## 88    28 2018     C             1       8.00                8          4
+## 89    29 2018     C             1      14.00                8          4
+## 90    30 2018     C             1       0.00                0          4
+## 91     1 2018     D             1       3.00                3          5
+## 92     2 2018     D             1      27.50               10          4
+## 93     3 2018     D             0       0.00                0          0
+## 94     4 2018     D             1      22.00                8          4
+## 95     5 2018     D             1      16.50                6          3
+## 96     6 2018     D             1       0.00                0          4
+## 97     7 2018     D             1       4.00                4          3
+## 98     8 2018     D             1      18.00                6          2
+## 99     9 2018     D             1       8.00                8          3
+## 100   10 2018     D             1       1.00                1          5
+## 101   11 2018     D             1       4.00                2          3
+## 102   12 2018     D             1      15.75                9          3
+## 103   13 2018     D             1       6.00                4          5
+## 104   14 2018     D             1      11.25                9          3
+## 105   15 2018     D             1       8.00                4          4
+## 106   16 2018     D             1      12.50                5          3
+## 107   17 2018     D             1       5.50                2          5
+## 108   18 2018     D             1       0.00                0          5
+## 109   19 2018     D             1       9.00                6          4
+## 110   20 2018     D             1      15.00                6          3
+## 111   21 2018     D             0       0.00                0          0
+## 112   22 2018     D             1      12.00                8          5
+## 113   23 2018     D             1      15.00                5          4
+## 114   24 2018     D             1      15.00                5          4
+## 115   25 2018     D             1      16.50                6          6
+## 116   26 2018     D             1      22.00               11          4
+## 117   27 2018     D             1       2.00                2          2
+## 118   28 2018     D             1      13.50                6          5
+## 119   29 2018     D             1       4.00                2          5
+## 120   30 2018     D             1       2.25                1          5
+## 121    1 2018     E             1      10.00                4          3
+## 122    2 2018     E             1       7.50                5          5
+## 123    3 2018     E             1       7.00                7          5
+## 124    4 2018     E             1      32.50               13          4
+## 125    5 2018     E             0       0.00                0          0
+## 126    6 2018     E             0       0.00                0          0
+## 127    7 2018     E             0       0.00                0          0
+## 128    8 2018     E             0       0.00                0          0
+## 129    9 2018     E             0       0.00                0          0
+## 130   10 2018     E             1      10.00                4          3
+## 131   11 2018     E             1      24.00                8          4
+## 132   12 2018     E             1      10.00                5          5
+## 133   13 2018     E             1       7.00                4          4
+## 134   14 2018     E             1      14.00                7          4
+## 135   15 2018     E             0       0.00                0          0
+## 136   16 2018     E             1      19.25                7          4
+## 137   17 2018     E             1      19.25                7          4
+## 138   18 2018     E             1      19.50               13          4
+## 139   19 2018     E             1      18.00                6          5
+## 140   20 2018     E             1       6.75                3          6
+## 141   21 2018     E             1       6.00                4          4
+## 142   22 2018     E             0       0.00                0          0
+## 143   23 2018     E             0       0.00                0          0
+## 144   24 2018     E             1       4.50                3          1
+## 145   25 2018     E             1      11.00                4          3
+## 146   26 2018     E             1      15.75                7          5
+## 147   27 2018     E             1       0.00                0          3
+## 148   28 2018     E             1       5.00                2          5
+## 149   29 2018     E             0       0.00                0          0
+## 150   30 2018     E             0       0.00                0          0
+
+
+

Histograms

+
#Generate a histogram of the watch time for the year 2018
+
+hist(D2$watch.time)
+

+
#Change the number of breaks to 100, do you get the same impression?
+
+hist(D2$watch.time, breaks = 100)
+

+
#Cut the y-axis off at 10
+
+hist(D2$watch.time, breaks = 100, ylim = c(0,10))
+

+
#Restore the y-axis and change the breaks so that they are 0-5, 5-20, 20-25, 25-35
+
+hist(D2$watch.time, breaks = c(0,5,20,25,35))
+

+
+
+

Plots

+
#Plot the number of confusion points against the watch time
+
+plot(D1$confusion.points, D1$watch.time)
+

+
#Create two variables x & y
+x <- c(1,3,2,7,6,4,4)
+y <- c(2,4,2,3,2,4,3)
+
+#Create a table from x & y
+table1 <- table(x,y)
+table1
+
##    y
+## x   2 3 4
+##   1 1 0 0
+##   2 1 0 0
+##   3 0 0 1
+##   4 0 1 1
+##   6 1 0 0
+##   7 0 1 0
+
#Display the table as a Barplot
+barplot(table1)
+

+
table1
+
##    y
+## x   2 3 4
+##   1 1 0 0
+##   2 1 0 0
+##   3 0 0 1
+##   4 0 1 1
+##   6 1 0 0
+##   7 0 1 0
+
#Create a data frame of the average total key points for each year and plot the two against each other as a lines
+
+D3 <- D1 %>% group_by(year) %>% summarise(mean_key = mean(key.points))
+
## `summarise()` ungrouping output (override with `.groups` argument)
+
plot(D3$year, D3$mean_key, type = "l", lty = "dashed")
+

+
#Create a boxplot of total enrollment for three students
+D4 <- filter(D1, stid == 4|stid == 20| stid == 22)
+#The drop levels command will remove all the schools from the variable with no data  
+D4 <- droplevels(D4)
+boxplot(D4$watch.time~D4$stid, xlab = "Student", ylab = "Watch Time")
+

## Pairs

+
#Use matrix notation to select columns 2, 5, 6, and 7
+D5 <- D1[,c(2,5,6,7)]
+#Draw a matrix of plots for every combination of variables
+pairs(D5)
+

## Part II

+
    +
  1. Create a simulated data set containing 100 students, each with a score from 1-100 representing performance in an educational game. The scores should tend to cluster around 75. Also, each student should be given a classification that reflects one of four interest groups: sport, music, nature, literature.
  2. +
+
#rnorm(100, 75, 15) creates a random sample with a mean of 75 and standard deviation of 15
+#pmax sets a maximum value, pmin sets a minimum value
+#round rounds numbers to whole number values
+#sample draws a random samples from the groups vector according to a uniform distribution
+score <- rnorm(100, 75, 15)
+hist(score, breaks = 30)
+

+
s1 <- data.frame(score)
+s1
+
##         score
+## 1    90.12277
+## 2    62.56622
+## 3    90.54175
+## 4    87.00259
+## 5    61.10177
+## 6    83.86110
+## 7    69.28404
+## 8    72.81397
+## 9    47.82355
+## 10   89.91117
+## 11   51.20224
+## 12   84.96020
+## 13  100.12495
+## 14   65.71475
+## 15   92.19781
+## 16   71.52665
+## 17   47.58650
+## 18   94.80028
+## 19   48.06289
+## 20   47.22903
+## 21   71.97148
+## 22   80.90574
+## 23   69.63911
+## 24   53.39208
+## 25   75.15094
+## 26   88.08375
+## 27   63.59659
+## 28   54.92399
+## 29   39.43996
+## 30   74.41598
+## 31   70.57450
+## 32   90.28911
+## 33   68.73865
+## 34   77.46461
+## 35   79.55874
+## 36   49.36791
+## 37   68.62514
+## 38   61.92730
+## 39  105.14063
+## 40   84.37605
+## 41   88.32617
+## 42   72.83367
+## 43   77.49704
+## 44   82.23881
+## 45   63.89380
+## 46   65.48691
+## 47   47.74406
+## 48   80.71828
+## 49   63.38009
+## 50   73.63539
+## 51   94.66302
+## 52   43.62196
+## 53   59.64099
+## 54   82.50441
+## 55   85.41847
+## 56   74.94899
+## 57   51.17241
+## 58   70.09713
+## 59   71.55696
+## 60   62.41766
+## 61   97.80306
+## 62   73.89282
+## 63   85.22152
+## 64   52.41677
+## 65   85.06132
+## 66   76.27287
+## 67   70.44929
+## 68   99.11804
+## 69   71.53525
+## 70   95.80843
+## 71   86.43885
+## 72   87.20852
+## 73  107.33153
+## 74   67.81648
+## 75   73.21547
+## 76   96.33486
+## 77   63.57735
+## 78   87.08566
+## 79   74.49806
+## 80   61.09316
+## 81   65.62750
+## 82   65.62864
+## 83   65.13166
+## 84   77.95485
+## 85   99.13133
+## 86   64.52652
+## 87   67.10931
+## 88  107.66049
+## 89   63.40978
+## 90   89.30227
+## 91   54.83919
+## 92   75.72112
+## 93   94.97915
+## 94   97.86007
+## 95   78.14981
+## 96  108.88606
+## 97   95.63370
+## 98   73.59439
+## 99   63.31810
+## 100  75.17315
+
library(dplyr)
+s1 <- filter(s1, score <= 100)
+hist(s1$score)
+

+
s2 <- data.frame(rep(100, 100-NROW(s1)))
+names(s2) <- "score"
+
+s3 <- bind_rows(s1, s2)
+
+s3$studentid <- seq(1, 100, 1)
+s3$score <- round(s3$score)
+interest <- c("sport", "music","nature", "literature")
+s3$interest <- sample(interest, 100, replace = TRUE)
+s3
+
##     score studentid   interest
+## 1      90         1 literature
+## 2      63         2      music
+## 3      91         3 literature
+## 4      87         4      sport
+## 5      61         5     nature
+## 6      84         6 literature
+## 7      69         7      sport
+## 8      73         8      sport
+## 9      48         9     nature
+## 10     90        10      music
+## 11     51        11 literature
+## 12     85        12 literature
+## 13     66        13     nature
+## 14     92        14     nature
+## 15     72        15      sport
+## 16     48        16      sport
+## 17     95        17      sport
+## 18     48        18      sport
+## 19     47        19 literature
+## 20     72        20      sport
+## 21     81        21     nature
+## 22     70        22 literature
+## 23     53        23      music
+## 24     75        24      sport
+## 25     88        25     nature
+## 26     64        26      sport
+## 27     55        27      sport
+## 28     39        28     nature
+## 29     74        29      sport
+## 30     71        30      sport
+## 31     90        31     nature
+## 32     69        32 literature
+## 33     77        33     nature
+## 34     80        34      sport
+## 35     49        35      sport
+## 36     69        36      sport
+## 37     62        37 literature
+## 38     84        38 literature
+## 39     88        39     nature
+## 40     73        40      music
+## 41     77        41 literature
+## 42     82        42 literature
+## 43     64        43 literature
+## 44     65        44 literature
+## 45     48        45 literature
+## 46     81        46      sport
+## 47     63        47      music
+## 48     74        48      music
+## 49     95        49      sport
+## 50     44        50 literature
+## 51     60        51      music
+## 52     83        52     nature
+## 53     85        53      music
+## 54     75        54      music
+## 55     51        55 literature
+## 56     70        56      music
+## 57     72        57      sport
+## 58     62        58     nature
+## 59     98        59      music
+## 60     74        60      music
+## 61     85        61      sport
+## 62     52        62     nature
+## 63     85        63      sport
+## 64     76        64 literature
+## 65     70        65      music
+## 66     99        66     nature
+## 67     72        67     nature
+## 68     96        68     nature
+## 69     86        69 literature
+## 70     87        70      music
+## 71     68        71 literature
+## 72     73        72      sport
+## 73     96        73      music
+## 74     64        74      sport
+## 75     87        75     nature
+## 76     74        76     nature
+## 77     61        77      sport
+## 78     66        78      music
+## 79     66        79 literature
+## 80     65        80      sport
+## 81     78        81      music
+## 82     99        82     nature
+## 83     65        83      music
+## 84     67        84     nature
+## 85     63        85     nature
+## 86     89        86 literature
+## 87     55        87      music
+## 88     76        88 literature
+## 89     95        89      music
+## 90     98        90      music
+## 91     78        91 literature
+## 92     96        92     nature
+## 93     74        93 literature
+## 94     63        94      music
+## 95     75        95     nature
+## 96    100        96     nature
+## 97    100        97      music
+## 98    100        98      sport
+## 99    100        99     nature
+## 100   100       100 literature
+
    +
  1. Using base R commands, draw a histogram of the scores. Change the breaks in your histogram until you think they best represent your data.
  2. +
+
hist(s3$score, breaks = 10, ylim = c(0, 30))
+

3. Create a new variable that groups the scores according to the breaks in your histogram.

+
#cut() divides the range of scores into intervals and codes the values in scores according to which interval they fall. We use a vector called `letters` as the labels, `letters` is a vector made up of the letters of the alphabet.
+s3$lables <- cut(s3$score, breaks = 10, labels = letters[1:10])
+
    +
  1. Now using the colorbrewer package (RColorBrewer; http://colorbrewer2.org/#type=sequential&scheme=BuGn&n=3) design a pallette and assign it to the groups in your data on the histogram.
  2. +
+
library(RColorBrewer)
+#Let's look at the available palettes in RColorBrewer
+
+#The top section of palettes are sequential, the middle section are qualitative, and the lower section are diverging.
+#Make RColorBrewer palette available to R and assign to your bins
+
+#Use named palette in histogram
+brewer.pal(10, "Set3")
+
##  [1] "#8DD3C7" "#FFFFB3" "#BEBADA" "#FB8072" "#80B1D3" "#FDB462" "#B3DE69"
+##  [8] "#FCCDE5" "#D9D9D9" "#BC80BD"
+
hist(s3$score, breaks = 10 , ylim = c(0, 30), col = brewer.pal(10, "Set3"), border = FALSE)
+

+
    +
  1. Create a boxplot that visualizes the scores for each interest group and color each interest group a different color.
  2. +
+
#Make a vector of the colors from RColorBrewer
+head(s3)
+
##   score studentid   interest lables
+## 1    90         1 literature      i
+## 2    63         2      music      d
+## 3    91         3 literature      i
+## 4    87         4      sport      h
+## 5    61         5     nature      d
+## 6    84         6 literature      h
+
boxplot(score ~ interest, data = s3)
+

+
brewer.pal(4, "Pastel1")
+
## [1] "#FBB4AE" "#B3CDE3" "#CCEBC5" "#DECBE4"
+
display.brewer.pal(4, "Pastel1")
+

+
boxplot(score ~ interest, data = s3, col = brewer.pal(4, "Pastel1"), border = "grey")
+

6. Now simulate a new variable that describes the number of logins that students made to the educational game. They should vary from 1-25.

+
(s3$logins <- sample(1:25, 100, replace = TRUE))
+
##   [1]  4  6 16  8 21  6 14 10 19 22  5  3  2  3  4 10  1 21  1 11 19 13 12 24 12
+##  [26]  3 12 14  3  4  2 13  1 25 12 11  4 13  7 16 10  3  1 14  5  2 25  6  3  1
+##  [51] 17 22  6  3  6 11 17  7 23 15  1  8  5 24 22 13  1  7 17  9  9 20 22  4  7
+##  [76] 18 24  9 25  7 16 11  5 21  8 13 24  4 21  7 12 14 16 11 13 11 14  3 19 16
+
    +
  1. Plot the relationships between logins and scores. Give the plot a title and color the dots according to interest group.
  2. +
+
plot(s3$logins ~ score, data = s3, main = "All About Games", ylab = "logins", pch = 7, col = c("plum2", "mediumturquoise", "darkseagreen1", "lavender"))
+

+
    +
  1. R contains several inbuilt data sets, one of these in called AirPassengers. Plot a line graph of the the airline passengers over time using this data set.
  2. +
+
plot(AirPassengers)
+

+
    +
  1. Using another inbuilt data set, iris, plot the relationships between all of the variables in the data set. Which of these relationships is it appropriate to run a correlation on?
  2. +
+
plot(iris)
+

+
cor(iris$Petal.Length,iris$Petal.Width)
+
## [1] 0.9628654
+
+
+

Part III - Analyzing Swirl

+
+

Data

+

In this repository you will find data describing Swirl activity from the class so far this semester. Please connect RStudio to this repository.

+
+

Instructions

+
    +
  1. Insert a new code block

  2. +
  3. Create a data frame from the swirl-data.csv file called DF1

  4. +
+
DF1 <- read.csv("swirl-data.csv", header = TRUE)
+DF1
+
##                    course_name                      lesson_name question_number
+## 1                R Programming                  Dates and Times              18
+## 2                R Programming                        Functions              11
+## 3                R Programming            Basic Building Blocks              14
+## 4                R Programming                  Dates and Times              17
+## 5                R Programming                  Dates and Times              22
+## 6                R Programming              Workspace and Files               5
+## 7                R Programming                        Functions               9
+## 8                R Programming                  Dates and Times              15
+## 9                R Programming                  Dates and Times              14
+## 10               R Programming                  Dates and Times              16
+## 11               R Programming            Basic Building Blocks              15
+## 12               R Programming                          Vectors              22
+## 13               R Programming            Basic Building Blocks              12
+## 14               R Programming                          Vectors              19
+## 15               R Programming              Workspace and Files               6
+## 16               R Programming               Subsetting Vectors              31
+## 17               R Programming                  Dates and Times              20
+## 18               R Programming               Subsetting Vectors              23
+## 19               R Programming                          Vectors              19
+## 20               R Programming                  Dates and Times              24
+## 21               R Programming               Subsetting Vectors              27
+## 22               R Programming                  Dates and Times              23
+## 23               R Programming                  Dates and Times              19
+## 24               R Programming               Subsetting Vectors              22
+## 25               R Programming                        Functions               5
+## 26               R Programming               Subsetting Vectors              26
+## 27               R Programming            Basic Building Blocks              11
+## 28               R Programming                          Vectors              23
+## 29               R Programming                            Logic              39
+## 30               R Programming            Basic Building Blocks              16
+## 31               R Programming              Workspace and Files               8
+## 32               R Programming              Workspace and Files               9
+## 33               R Programming               Subsetting Vectors              33
+## 34               R Programming                  Dates and Times              27
+## 35               R Programming              Workspace and Files              11
+## 36               R Programming                  Dates and Times              28
+## 37               R Programming                  Dates and Times              29
+## 38               R Programming                          Vectors              18
+## 39               R Programming               Subsetting Vectors              29
+## 40               R Programming               Subsetting Vectors              30
+## 41               R Programming            Basic Building Blocks              10
+## 42               R Programming                  Dates and Times              38
+## 43               R Programming                  Dates and Times              39
+## 44               R Programming            Basic Building Blocks              17
+## 45               R Programming               Subsetting Vectors              32
+## 46               R Programming                            Logic              43
+## 47               R Programming              Workspace and Files              10
+## 48               R Programming               Subsetting Vectors              34
+## 49               R Programming                            Logic              36
+## 50               R Programming                            Logic              36
+## 51               R Programming               Subsetting Vectors              21
+## 52               R Programming                        Functions               8
+## 53               R Programming                            Logic              38
+## 54               R Programming                  Dates and Times              37
+## 55               R Programming                          Vectors              17
+## 56               R Programming            Basic Building Blocks               3
+## 57               R Programming                            Logic              41
+## 58               R Programming                            Logic              42
+## 59               R Programming                   Missing Values               8
+## 60               R Programming                            Logic              33
+## 61               R Programming              Workspace and Files              31
+## 62               R Programming               Subsetting Vectors              36
+## 63               R Programming              Workspace and Files              14
+## 64               R Programming              Workspace and Files              15
+## 65               R Programming                  Dates and Times              13
+## 66               R Programming                            Logic              37
+## 67               R Programming            Basic Building Blocks               8
+## 68               R Programming                  Dates and Times              35
+## 69               R Programming                   Missing Values               4
+## 70               R Programming                   Missing Values               6
+## 71               R Programming                   Missing Values               7
+## 72               R Programming               Subsetting Vectors               9
+## 73               R Programming                            Logic              46
+## 74               R Programming                            Logic              33
+## 75               R Programming                            Logic              35
+## 76               R Programming                  Dates and Times               8
+## 77               R Programming                  Dates and Times               9
+## 78               R Programming                  Dates and Times              12
+## 79               R Programming                        Functions               3
+## 80               R Programming                  Dates and Times              33
+## 81               R Programming                            Logic              27
+## 82               R Programming                  Dates and Times              32
+## 83               R Programming                   Missing Values               3
+## 84               R Programming              Workspace and Files              22
+## 85               R Programming              Workspace and Files              23
+## 86               R Programming                        Functions              13
+## 87               R Programming            Basic Building Blocks              18
+## 88               R Programming            Basic Building Blocks              21
+## 89               R Programming            Basic Building Blocks              22
+## 90               R Programming               Subsetting Vectors              37
+## 91               R Programming                  Dates and Times              11
+## 92               R Programming               Subsetting Vectors              17
+## 93               R Programming                          Vectors               8
+## 94               R Programming                          Vectors              11
+## 95               R Programming              Workspace and Files              41
+## 96               R Programming              Workspace and Files              42
+## 97               R Programming                        Functions              52
+## 98               R Programming                            Logic              28
+## 99               R Programming              Workspace and Files              25
+## 100              R Programming              Workspace and Files              33
+## 101              R Programming                   Missing Values               9
+## 102              R Programming              Workspace and Files              34
+## 103              R Programming              Workspace and Files              35
+## 104              R Programming               Subsetting Vectors              38
+## 105              R Programming              Workspace and Files              15
+## 106              R Programming              Workspace and Files              17
+## 107              R Programming                  Dates and Times              30
+## 108              R Programming               Subsetting Vectors              42
+## 109              R Programming              Workspace and Files              19
+## 110              R Programming              Workspace and Files              21
+## 111              R Programming                            Logic               6
+## 112              R Programming                            Logic              30
+## 113              R Programming                            Logic              32
+## 114              R Programming                  Dates and Times               7
+## 115              R Programming               Subsetting Vectors              11
+## 116              R Programming               Subsetting Vectors              13
+## 117              R Programming               Subsetting Vectors              14
+## 118              R Programming               Subsetting Vectors              15
+## 119              R Programming                          Vectors               7
+## 120              R Programming               Subsetting Vectors              41
+## 121              R Programming              Workspace and Files              40
+## 122              R Programming                   Missing Values              19
+## 123              R Programming                   Missing Values              20
+## 124              R Programming                   Missing Values              21
+## 125              R Programming                            Logic               7
+## 126              R Programming                            Logic               9
+## 127              R Programming                          Vectors              25
+## 128              R Programming                            Logic              44
+## 129              R Programming                            Logic              47
+## 130              R Programming            Basic Building Blocks              23
+## 131              R Programming            Basic Building Blocks              25
+## 132              R Programming               Subsetting Vectors              40
+## 133              R Programming                            Logic              18
+## 134              R Programming            Basic Building Blocks              26
+## 135              R Programming            Basic Building Blocks              27
+## 136              R Programming            Basic Building Blocks              31
+## 137              R Programming                            Logic               4
+## 138              R Programming                   Missing Values              22
+## 139              R Programming                   Missing Values              23
+## 140              R Programming              Workspace and Files              27
+## 141              R Programming              Workspace and Files              29
+## 142              R Programming                            Logic              14
+## 143              R Programming              Workspace and Files              32
+## 144              R Programming                            Logic              15
+## 145              R Programming                            Logic              17
+## 146              R Programming            Basic Building Blocks              26
+## 147              R Programming                   Missing Values              17
+## 148              R Programming                   Missing Values              18
+## 149              R Programming                            Logic              20
+## 150              R Programming                            Logic              21
+## 151              R Programming                        Functions              32
+## 152              R Programming                        Functions              34
+## 153              R Programming               Subsetting Vectors               5
+## 154              R Programming               Subsetting Vectors              10
+## 155              R Programming                  Dates and Times               5
+## 156              R Programming                        Functions              16
+## 157              R Programming                          Vectors               5
+## 158              R Programming                          Vectors               6
+## 159              R Programming                   Missing Values              12
+## 160              R Programming                        Functions              21
+## 161              R Programming                        Functions              23
+## 162              R Programming                        Functions              25
+## 163              R Programming                        Functions              27
+## 164              R Programming                            Logic              23
+## 165              R Programming                        Functions              50
+## 166              R Programming                        Functions              34
+## 167              R Programming                            Logic              10
+## 168              R Programming                        Functions              14
+## 169              R Programming                            Logic              13
+## 170              R Programming                        Functions              17
+## 171              R Programming                        Functions              19
+## 172              R Programming                            Logic              49
+## 173              R Programming                        Functions              40
+## 174              R Programming                        Functions              41
+## 175              R Programming                        Functions              42
+## 176              R Programming                            Logic              53
+## 177              R Programming                        Functions              28
+## 178              R Programming                          Vectors              40
+## 179              R Programming                        Functions              51
+## 180              R Programming                  Dates and Times               3
+## 181              R Programming                            Logic              12
+## 182              R Programming               Subsetting Vectors               8
+## 183              R Programming                        Functions              36
+## 184              R Programming                   Missing Values              10
+## 185              R Programming                            Logic              15
+## 186              R Programming                          Vectors              30
+## 187              R Programming                          Vectors              32
+## 188              R Programming                          Vectors              33
+## 189              R Programming            Basic Building Blocks              33
+## 190              R Programming                        Functions              43
+## 191              R Programming                        Functions              47
+## 192              R Programming                          Vectors              41
+## 193              R Programming                          Vectors              29
+## 194              R Programming                  Dates and Times               4
+## 195              R Programming                        Functions              35
+## 196              R Programming                          Vectors              28
+## 197              R Programming                        Functions              48
+## 198              R Programming            Basic Building Blocks              40
+## 199              R Programming            Basic Building Blocks              41
+## 200              R Programming                        Functions              38
+## 201              R Programming                        Functions              35
+## 202              R Programming                        Functions              35
+## 203              R Programming                            Logic              54
+## 204              R Programming                            Logic              55
+## 205              R Programming                          Vectors              35
+## 206              R Programming                          Vectors              39
+## 207              R Programming                        Functions              35
+## 208              R Programming               Subsetting Vectors               3
+## 209              R Programming            Basic Building Blocks              36
+## 210              R Programming            Basic Building Blocks              38
+## 211              R Programming            Basic Building Blocks              39
+## 212              R Programming                          Vectors              33
+## 213              R Programming                            Logic              50
+## 214              R Programming                            Logic              51
+## 215              R Programming            Basic Building Blocks              21
+## 216              R Programming                   Missing Values              10
+## 217              R Programming                   Missing Values              17
+## 218              R Programming                   Missing Values               9
+## 219              R Programming                   Missing Values               9
+## 220              R Programming            Basic Building Blocks              18
+## 221  Getting and Cleaning Data          Tidying Data with tidyr               6
+## 222  Getting and Cleaning Data          Tidying Data with tidyr               8
+## 223              R Programming                   Missing Values              10
+## 224              R Programming                   Missing Values               8
+## 225  Getting and Cleaning Data          Tidying Data with tidyr              53
+## 226  Getting and Cleaning Data          Tidying Data with tidyr              54
+## 227              R Programming               Subsetting Vectors              40
+## 228              R Programming               Subsetting Vectors              41
+## 229              R Programming                   Missing Values              12
+## 230  Getting and Cleaning Data          Tidying Data with tidyr              15
+## 231  Getting and Cleaning Data          Tidying Data with tidyr              11
+## 232  Getting and Cleaning Data          Tidying Data with tidyr              54
+## 233              R Programming                   Missing Values               7
+## 234  Getting and Cleaning Data          Tidying Data with tidyr               3
+## 235              R Programming               Subsetting Vectors              38
+## 236              R Programming                   Missing Values               4
+## 237              R Programming                  Dates and Times               7
+## 238              R Programming                   Missing Values              23
+## 239              R Programming               Subsetting Vectors               3
+## 240  Getting and Cleaning Data          Tidying Data with tidyr              54
+## 241              R Programming                  Dates and Times               8
+## 242  Getting and Cleaning Data          Tidying Data with tidyr              12
+## 243              R Programming                  Dates and Times               9
+## 244              R Programming                   Missing Values              18
+## 245              R Programming                   Missing Values               6
+## 246              R Programming            Basic Building Blocks              17
+## 247              R Programming                        Functions              40
+## 248              R Programming               Subsetting Vectors              37
+## 249              R Programming                   Missing Values               3
+## 250              R Programming                  Looking at Data              17
+## 251  Getting and Cleaning Data Grouping and Chaining with dplyr              54
+## 252  Getting and Cleaning Data Grouping and Chaining with dplyr              55
+## 253  Getting and Cleaning Data     Manipulating Data with dplyr              48
+## 254              R Programming               Subsetting Vectors               5
+## 255              R Programming                            Logic              49
+## 256              R Programming            Basic Building Blocks               3
+## 257  Getting and Cleaning Data          Tidying Data with tidyr              18
+## 258  Getting and Cleaning Data          Tidying Data with tidyr              19
+## 259  Getting and Cleaning Data          Tidying Data with tidyr              53
+## 260  Getting and Cleaning Data          Tidying Data with tidyr              52
+## 261              R Programming            Basic Building Blocks              17
+## 262              R Programming                  Looking at Data              15
+## 263              R Programming                  Looking at Data              16
+## 264              R Programming                   Missing Values              21
+## 265              R Programming                   Missing Values              22
+## 266  Getting and Cleaning Data          Tidying Data with tidyr              30
+## 267              R Programming                            Logic               7
+## 268              R Programming                  Dates and Times               9
+## 269              R Programming                        Functions              42
+## 270              R Programming                  Dates and Times              11
+## 271              R Programming                  Dates and Times              11
+## 272              R Programming               Subsetting Vectors              36
+## 273              R Programming               Subsetting Vectors              34
+## 274  Getting and Cleaning Data          Tidying Data with tidyr              48
+## 275              R Programming                   Missing Values              20
+## 276              R Programming                   Missing Values              20
+## 277              R Programming            Basic Building Blocks              17
+## 278              R Programming                        Functions              38
+## 279              R Programming                            Logic               6
+## 280  Getting and Cleaning Data          Tidying Data with tidyr              28
+## 281              R Programming                        Functions              41
+## 282  Getting and Cleaning Data Grouping and Chaining with dplyr              35
+## 283              R Programming                        Functions              42
+## 284  Getting and Cleaning Data          Tidying Data with tidyr              56
+## 285              R Programming                  Dates and Times              12
+## 286              R Programming                   Missing Values              19
+## 287              R Programming               Subsetting Vectors              33
+## 288              R Programming            Basic Building Blocks              15
+## 289              R Programming            Basic Building Blocks              16
+## 290  Getting and Cleaning Data          Tidying Data with tidyr              21
+## 291  Getting and Cleaning Data          Tidying Data with tidyr              24
+## 292  Getting and Cleaning Data          Tidying Data with tidyr              25
+## 293              R Programming                  Dates and Times               4
+## 294  Getting and Cleaning Data          Tidying Data with tidyr              30
+## 295              R Programming                            Logic               9
+## 296              R Programming               Subsetting Vectors              26
+## 297              R Programming                            Logic              12
+## 298  Getting and Cleaning Data          Tidying Data with tidyr              57
+## 299  Getting and Cleaning Data          Tidying Data with tidyr              58
+## 300  Getting and Cleaning Data          Tidying Data with tidyr              20
+## 301  Getting and Cleaning Data          Tidying Data with tidyr              20
+## 302              R Programming                  Dates and Times              15
+## 303  Getting and Cleaning Data          Tidying Data with tidyr              47
+## 304              R Programming                        Functions              36
+## 305              R Programming                            Logic               4
+## 306              R Programming              Workspace and Files              34
+## 307              R Programming                  Dates and Times               5
+## 308  Getting and Cleaning Data          Tidying Data with tidyr              29
+## 309              R Programming                            Logic              10
+## 310              R Programming               Subsetting Vectors               8
+## 311              R Programming              Workspace and Files              22
+## 312              R Programming              Workspace and Files              23
+## 313              R Programming              Workspace and Files              25
+## 314              R Programming            Basic Building Blocks              14
+## 315              R Programming               Subsetting Vectors              32
+## 316              R Programming              Workspace and Files              31
+## 317              R Programming              Workspace and Files              32
+## 318              R Programming              Workspace and Files              33
+## 319  Getting and Cleaning Data Grouping and Chaining with dplyr              32
+## 320              R Programming              Workspace and Files              35
+## 321  Getting and Cleaning Data Grouping and Chaining with dplyr              34
+## 322              R Programming               Subsetting Vectors              23
+## 323              R Programming                            Logic              44
+## 324              R Programming            Basic Building Blocks               8
+## 325              R Programming            Basic Building Blocks              10
+## 326              R Programming            Basic Building Blocks              11
+## 327              R Programming                  Dates and Times              13
+## 328              R Programming                  Dates and Times              14
+## 329              R Programming                            Logic              53
+## 330              R Programming                          Vectors              19
+## 331              R Programming                            Logic              55
+## 332              R Programming                  Dates and Times               3
+## 333              R Programming                  Looking at Data              11
+## 334              R Programming              Workspace and Files              14
+## 335              R Programming              Workspace and Files              15
+## 336  Getting and Cleaning Data     Manipulating Data with dplyr              48
+## 337  Getting and Cleaning Data     Manipulating Data with dplyr              49
+## 338  Getting and Cleaning Data     Manipulating Data with dplyr              50
+## 339              R Programming            Basic Building Blocks              22
+## 340              R Programming            Basic Building Blocks              12
+## 341              R Programming                            Logic              51
+## 342              R Programming            Basic Building Blocks              26
+## 343              R Programming                            Logic              54
+## 344              R Programming            Basic Building Blocks              31
+## 345              R Programming            Basic Building Blocks              33
+## 346              R Programming            Basic Building Blocks              36
+## 347              R Programming            Basic Building Blocks              36
+## 348              R Programming              Workspace and Files              40
+## 349  Getting and Cleaning Data          Tidying Data with tidyr              30
+## 350              R Programming            Basic Building Blocks              40
+## 351              R Programming            Basic Building Blocks              41
+## 352              R Programming               Subsetting Vectors               9
+## 353              R Programming            Basic Building Blocks              23
+## 354              R Programming            Basic Building Blocks              25
+## 355              R Programming                          Vectors              11
+## 356              R Programming            Basic Building Blocks              27
+## 357              R Programming                          Vectors              18
+## 358  Getting and Cleaning Data Grouping and Chaining with dplyr              27
+## 359  Getting and Cleaning Data Grouping and Chaining with dplyr              31
+## 360  Getting and Cleaning Data Grouping and Chaining with dplyr              33
+## 361              R Programming                            Logic              42
+## 362              R Programming                            Logic              43
+## 363  Getting and Cleaning Data          Tidying Data with tidyr              34
+## 364              R Programming                            Logic              46
+## 365              R Programming                            Logic              47
+## 366  Getting and Cleaning Data     Manipulating Data with dplyr              37
+## 367              R Programming                            Logic              50
+## 368              R Programming               Subsetting Vectors              31
+## 369              R Programming               Subsetting Vectors              32
+## 370              R Programming                        Functions              35
+## 371              R Programming                        Functions              35
+## 372              R Programming                  Looking at Data              13
+## 373              R Programming              Workspace and Files              11
+## 374              R Programming                          Vectors              41
+## 375  Getting and Cleaning Data     Manipulating Data with dplyr              47
+## 376              R Programming              Workspace and Files              15
+## 377              R Programming                  Looking at Data              20
+## 378              R Programming                  Looking at Data              22
+## 379              R Programming                        Functions              42
+## 380              R Programming                        Functions              43
+## 381              R Programming                        Functions              47
+## 382              R Programming                        Functions              47
+## 383              R Programming                        Functions              48
+## 384              R Programming                        Functions              48
+## 385              R Programming                        Functions              50
+## 386              R Programming                        Functions              51
+## 387              R Programming                        Functions              52
+## 388              R Programming            Basic Building Blocks              36
+## 389              R Programming            Basic Building Blocks              39
+## 390              R Programming              Workspace and Files              42
+## 391              R Programming                          Vectors               5
+## 392              R Programming                          Vectors               6
+## 393              R Programming                          Vectors               7
+## 394              R Programming                          Vectors               8
+## 395              R Programming               Subsetting Vectors              11
+## 396              R Programming                          Vectors              17
+## 397              R Programming               Subsetting Vectors              14
+## 398              R Programming               Subsetting Vectors              15
+## 399              R Programming               Subsetting Vectors              17
+## 400              R Programming                            Logic              42
+## 401              R Programming               Subsetting Vectors              21
+## 402              R Programming               Subsetting Vectors              22
+## 403              R Programming         Matrices and Data Frames               6
+## 404  Getting and Cleaning Data          Tidying Data with tidyr              37
+## 405              R Programming               Subsetting Vectors              27
+## 406              R Programming               Subsetting Vectors              29
+## 407              R Programming               Subsetting Vectors              30
+## 408              R Programming              Workspace and Files               5
+## 409              R Programming              Workspace and Files               6
+## 410              R Programming              Workspace and Files               8
+## 411              R Programming              Workspace and Files               9
+## 412              R Programming              Workspace and Files              10
+## 413              R Programming                          Vectors              40
+## 414              R Programming         Matrices and Data Frames              21
+## 415              R Programming         Matrices and Data Frames              22
+## 416              R Programming         Matrices and Data Frames              26
+## 417              R Programming              Workspace and Files              17
+## 418              R Programming              Workspace and Files              19
+## 419              R Programming              Workspace and Files              21
+## 420  Getting and Cleaning Data          Tidying Data with tidyr              19
+## 421  Getting and Cleaning Data          Tidying Data with tidyr              20
+## 422  Getting and Cleaning Data          Tidying Data with tidyr              21
+## 423              R Programming              Workspace and Files              27
+## 424              R Programming              Workspace and Files              29
+## 425  Getting and Cleaning Data          Tidying Data with tidyr              28
+## 426  Getting and Cleaning Data          Tidying Data with tidyr              29
+## 427  Getting and Cleaning Data          Tidying Data with tidyr              30
+## 428  Getting and Cleaning Data          Tidying Data with tidyr              30
+## 429              R Programming            Basic Building Blocks              36
+## 430              R Programming            Basic Building Blocks              38
+## 431              R Programming                  Dates and Times              20
+## 432              R Programming                  Dates and Times              22
+## 433  Getting and Cleaning Data          Tidying Data with tidyr              30
+## 434              R Programming               Subsetting Vectors              10
+## 435  Getting and Cleaning Data Grouping and Chaining with dplyr              22
+## 436              R Programming               Subsetting Vectors              13
+## 437  Getting and Cleaning Data Grouping and Chaining with dplyr              25
+## 438  Getting and Cleaning Data Grouping and Chaining with dplyr              26
+## 439  Getting and Cleaning Data          Tidying Data with tidyr              46
+## 440              R Programming               Subsetting Vectors              21
+## 441              R Programming                          Vectors              22
+## 442              R Programming                          Vectors              23
+## 443              R Programming                          Vectors              25
+## 444              R Programming                          Vectors              28
+## 445              R Programming                          Vectors              29
+## 446              R Programming                          Vectors              30
+## 447              R Programming                          Vectors              30
+## 448              R Programming                          Vectors              32
+## 449              R Programming                          Vectors              33
+## 450              R Programming                          Vectors              33
+## 451              R Programming                          Vectors              35
+## 452              R Programming                          Vectors              39
+## 453  Getting and Cleaning Data          Tidying Data with tidyr              46
+## 454  Getting and Cleaning Data Grouping and Chaining with dplyr              51
+## 455  Getting and Cleaning Data Grouping and Chaining with dplyr              53
+## 456  Getting and Cleaning Data          Tidying Data with tidyr               6
+## 457              R Programming         Matrices and Data Frames              27
+## 458              R Programming         Matrices and Data Frames              30
+## 459              R Programming         Matrices and Data Frames              33
+## 460  Getting and Cleaning Data     Manipulating Data with dplyr              53
+## 461  Getting and Cleaning Data     Manipulating Data with dplyr              55
+## 462  Getting and Cleaning Data     Manipulating Data with dplyr              56
+## 463  Getting and Cleaning Data     Manipulating Data with dplyr              56
+## 464  Getting and Cleaning Data     Manipulating Data with dplyr              57
+## 465  Getting and Cleaning Data     Manipulating Data with dplyr              57
+## 466  Getting and Cleaning Data     Manipulating Data with dplyr              61
+## 467              R Programming                  Dates and Times              16
+## 468              R Programming                  Dates and Times              16
+## 469  Getting and Cleaning Data          Tidying Data with tidyr              31
+## 470              R Programming              Workspace and Files              41
+## 471  Getting and Cleaning Data Grouping and Chaining with dplyr              16
+## 472  Getting and Cleaning Data Grouping and Chaining with dplyr              16
+## 473  Getting and Cleaning Data Grouping and Chaining with dplyr              17
+## 474  Getting and Cleaning Data Grouping and Chaining with dplyr              21
+## 475              R Programming                  Dates and Times              23
+## 476  Getting and Cleaning Data Grouping and Chaining with dplyr              23
+## 477  Getting and Cleaning Data          Tidying Data with tidyr              30
+## 478  Getting and Cleaning Data          Tidying Data with tidyr              30
+## 479  Getting and Cleaning Data          Tidying Data with tidyr              30
+## 480  Getting and Cleaning Data          Tidying Data with tidyr              47
+## 481  Getting and Cleaning Data          Tidying Data with tidyr              32
+## 482  Getting and Cleaning Data          Tidying Data with tidyr              33
+## 483  Getting and Cleaning Data          Tidying Data with tidyr              33
+## 484              R Programming                  Dates and Times              38
+## 485              R Programming                  Dates and Times              39
+## 486              R Programming                        Functions              23
+## 487              R Programming                        Functions              25
+## 488              R Programming                        Functions              27
+## 489              R Programming                        Functions              28
+## 490              R Programming                        Functions              32
+## 491              R Programming                        Functions              34
+## 492              R Programming                        Functions              34
+## 493              R Programming         Matrices and Data Frames              18
+## 494              R Programming                  Looking at Data              10
+## 495  Getting and Cleaning Data          Tidying Data with tidyr               3
+## 496  Getting and Cleaning Data     Manipulating Data with dplyr              46
+## 497  Getting and Cleaning Data          Tidying Data with tidyr               8
+## 498  Getting and Cleaning Data          Tidying Data with tidyr              11
+## 499  Getting and Cleaning Data          Tidying Data with tidyr              12
+## 500              R Programming                  Looking at Data              26
+## 501              R Programming               Subsetting Vectors              42
+## 502              R Programming                  Looking at Data              28
+## 503  Exploratory_Data_Analysis                 Plotting_Systems               5
+## 504  Exploratory_Data_Analysis                 Plotting_Systems               7
+## 505  Exploratory_Data_Analysis                 Plotting_Systems               9
+## 506  Exploratory_Data_Analysis                 Plotting_Systems               9
+## 507  Exploratory_Data_Analysis                 Plotting_Systems              11
+## 508  Exploratory_Data_Analysis                 Plotting_Systems              16
+## 509              R Programming                  Dates and Times              17
+## 510              R Programming                  Dates and Times              18
+## 511              R Programming                  Dates and Times              19
+## 512  Getting and Cleaning Data          Tidying Data with tidyr              33
+## 513  Getting and Cleaning Data          Tidying Data with tidyr              33
+## 514  Getting and Cleaning Data          Tidying Data with tidyr              34
+## 515  Exploratory_Data_Analysis                 Plotting_Systems              27
+## 516  Getting and Cleaning Data          Tidying Data with tidyr              30
+## 517  Getting and Cleaning Data          Tidying Data with tidyr              39
+## 518  Exploratory_Data_Analysis                 Plotting_Systems              28
+## 519  Exploratory_Data_Analysis                 Plotting_Systems              31
+## 520  Getting and Cleaning Data          Tidying Data with tidyr              31
+## 521              R Programming         Matrices and Data Frames               3
+## 522              R Programming         Matrices and Data Frames               4
+## 523              R Programming         Matrices and Data Frames               5
+## 524  Exploratory_Data_Analysis                 Plotting_Systems              35
+## 525              R Programming         Matrices and Data Frames               7
+## 526              R Programming         Matrices and Data Frames               9
+## 527              R Programming         Matrices and Data Frames              10
+## 528              R Programming         Matrices and Data Frames              12
+## 529              R Programming         Matrices and Data Frames              13
+## 530              R Programming         Matrices and Data Frames              14
+## 531              R Programming         Matrices and Data Frames              16
+## 532              R Programming         Matrices and Data Frames              17
+## 533  Getting and Cleaning Data Grouping and Chaining with dplyr              50
+## 534  Getting and Cleaning Data     Manipulating Data with dplyr              44
+## 535  Getting and Cleaning Data     Manipulating Data with dplyr              45
+## 536  Getting and Cleaning Data Grouping and Chaining with dplyr              10
+## 537  Getting and Cleaning Data Grouping and Chaining with dplyr              11
+## 538  Getting and Cleaning Data          Tidying Data with tidyr              32
+## 539  Exploratory_Data_Analysis                 Plotting_Systems              19
+## 540              R Programming         Matrices and Data Frames              34
+## 541              R Programming                            Logic              13
+## 542              R Programming                            Logic              14
+## 543  Getting and Cleaning Data Grouping and Chaining with dplyr               5
+## 544  Getting and Cleaning Data Grouping and Chaining with dplyr               6
+## 545  Getting and Cleaning Data Grouping and Chaining with dplyr               6
+## 546  Getting and Cleaning Data Grouping and Chaining with dplyr               7
+## 547  Getting and Cleaning Data Grouping and Chaining with dplyr               8
+## 548  Getting and Cleaning Data Grouping and Chaining with dplyr               9
+## 549              R Programming         Matrices and Data Frames              34
+## 550              R Programming         Matrices and Data Frames              35
+## 551              R Programming         Matrices and Data Frames              37
+## 552              R Programming         Matrices and Data Frames              38
+## 553  Exploratory_Data_Analysis                 Plotting_Systems              19
+## 554  Exploratory_Data_Analysis                 Plotting_Systems              20
+## 555  Getting and Cleaning Data          Tidying Data with tidyr              37
+## 556  Getting and Cleaning Data          Tidying Data with tidyr              38
+## 557              R Programming                  Dates and Times              24
+## 558  Getting and Cleaning Data          Tidying Data with tidyr              42
+## 559  Getting and Cleaning Data          Tidying Data with tidyr              43
+## 560              R Programming         Matrices and Data Frames              30
+## 561              R Programming         Matrices and Data Frames              33
+## 562              R Programming                            Logic              20
+## 563  Getting and Cleaning Data     Manipulating Data with dplyr              62
+## 564  Getting and Cleaning Data     Manipulating Data with dplyr              63
+## 565  Exploratory_Data_Analysis                 Plotting_Systems              17
+## 566              R Programming         Matrices and Data Frames              39
+## 567  Getting and Cleaning Data Grouping and Chaining with dplyr              39
+## 568  Getting and Cleaning Data Grouping and Chaining with dplyr              42
+## 569  Getting and Cleaning Data Grouping and Chaining with dplyr              43
+## 570  Getting and Cleaning Data Grouping and Chaining with dplyr              45
+## 571  Getting and Cleaning Data Grouping and Chaining with dplyr              48
+## 572  Getting and Cleaning Data Grouping and Chaining with dplyr              49
+## 573  Getting and Cleaning Data          Tidying Data with tidyr              46
+## 574              R Programming                  Looking at Data               9
+## 575              R Programming                  Dates and Times              30
+## 576              R Programming                  Dates and Times              32
+## 577              R Programming                  Dates and Times              33
+## 578              R Programming                  Dates and Times              35
+## 579  Getting and Cleaning Data Grouping and Chaining with dplyr              14
+## 580  Getting and Cleaning Data          Tidying Data with tidyr              15
+## 581  Getting and Cleaning Data          Tidying Data with tidyr              18
+## 582              R Programming                  Looking at Data              27
+## 583              R Programming         Matrices and Data Frames              34
+## 584              R Programming                            Logic              15
+## 585              R Programming                            Logic              15
+## 586              R Programming                            Logic              17
+## 587              R Programming                            Logic              18
+## 588  Getting and Cleaning Data          Tidying Data with tidyr              24
+## 589  Getting and Cleaning Data          Tidying Data with tidyr              25
+## 590              R Programming                            Logic              21
+## 591              R Programming                            Logic              23
+## 592              R Programming                  Dates and Times              37
+## 593  Getting and Cleaning Data Grouping and Chaining with dplyr              14
+## 594              R Programming         Matrices and Data Frames              16
+## 595  Exploratory_Data_Analysis                 Plotting_Systems              21
+## 596  Exploratory_Data_Analysis                 Plotting_Systems              25
+## 597  Exploratory_Data_Analysis                 Plotting_Systems              26
+## 598              R Programming                  Dates and Times              27
+## 599              R Programming                  Dates and Times              28
+## 600              R Programming                  Dates and Times              29
+## 601              R Programming         Matrices and Data Frames              27
+## 602  Exploratory_Data_Analysis                 Plotting_Systems              32
+## 603              R Programming         Matrices and Data Frames               3
+## 604  Exploratory_Data_Analysis                 Plotting_Systems              33
+## 605              R Programming                            Logic              27
+## 606              R Programming                        Functions              19
+## 607              R Programming                        Functions              21
+## 608  Getting and Cleaning Data          Tidying Data with tidyr              38
+## 609  Getting and Cleaning Data          Tidying Data with tidyr              38
+## 610  Getting and Cleaning Data          Tidying Data with tidyr              39
+## 611  Getting and Cleaning Data          Tidying Data with tidyr              42
+## 612  Getting and Cleaning Data          Tidying Data with tidyr              43
+## 613  Getting and Cleaning Data     Manipulating Data with dplyr              41
+## 614              R Programming                  Looking at Data               8
+## 615              R Programming         Matrices and Data Frames              37
+## 616              R Programming         Matrices and Data Frames               4
+## 617              R Programming         Matrices and Data Frames               6
+## 618  Exploratory_Data_Analysis                 Plotting_Systems              34
+## 619              R Programming         Matrices and Data Frames              10
+## 620              R Programming         Matrices and Data Frames              12
+## 621              R Programming         Matrices and Data Frames              13
+## 622  Getting and Cleaning Data          Tidying Data with tidyr              18
+## 623              R Programming         Matrices and Data Frames              18
+## 624              R Programming         Matrices and Data Frames              21
+## 625              R Programming         Matrices and Data Frames              35
+## 626              R Programming         Matrices and Data Frames               3
+## 627              R Programming                        Functions               3
+## 628              R Programming                        Functions               3
+## 629              R Programming                            Logic              38
+## 630              R Programming                            Logic              39
+## 631              R Programming         Matrices and Data Frames               7
+## 632  Getting and Cleaning Data     Manipulating Data with dplyr              30
+## 633  Exploratory_Data_Analysis                 Plotting_Systems              36
+## 634  Exploratory_Data_Analysis                 Plotting_Systems              36
+## 635              R Programming         Matrices and Data Frames              17
+## 636  Exploratory_Data_Analysis                 Plotting_Systems              39
+## 637  Exploratory_Data_Analysis                 Plotting_Systems              40
+## 638              R Programming         Matrices and Data Frames              22
+## 639              R Programming         Matrices and Data Frames              26
+## 640              R Programming                  Looking at Data               6
+## 641              R Programming                            Logic              36
+## 642              R Programming                            Logic              37
+## 643              R Programming                        Functions               5
+## 644              R Programming                            Logic              41
+## 645              R Programming         Matrices and Data Frames               9
+## 646  Getting and Cleaning Data     Manipulating Data with dplyr               6
+## 647  Getting and Cleaning Data     Manipulating Data with dplyr               7
+## 648  Exploratory_Data_Analysis                 Plotting_Systems              38
+## 649              R Programming         Matrices and Data Frames              14
+## 650              R Programming                            Logic              32
+## 651  Getting and Cleaning Data     Manipulating Data with dplyr              39
+## 652  Getting and Cleaning Data     Manipulating Data with dplyr              40
+## 653  Getting and Cleaning Data     Manipulating Data with dplyr              12
+## 654  Getting and Cleaning Data          Tidying Data with tidyr              58
+## 655  Getting and Cleaning Data     Manipulating Data with dplyr              16
+## 656  Getting and Cleaning Data     Manipulating Data with dplyr              18
+## 657              R Programming         Matrices and Data Frames               5
+## 658  Getting and Cleaning Data     Manipulating Data with dplyr              28
+## 659              R Programming                        Functions              13
+## 660  Getting and Cleaning Data     Manipulating Data with dplyr              33
+## 661  Getting and Cleaning Data     Manipulating Data with dplyr               8
+## 662  Getting and Cleaning Data     Manipulating Data with dplyr              35
+## 663  Getting and Cleaning Data     Manipulating Data with dplyr              36
+## 664              R Programming                            Logic              33
+## 665              R Programming                            Logic              35
+## 666  Getting and Cleaning Data     Manipulating Data with dplyr              10
+## 667  Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 668  Getting and Cleaning Data     Manipulating Data with dplyr               5
+## 669  Getting and Cleaning Data     Manipulating Data with dplyr              27
+## 670              R Programming                        Functions               8
+## 671              R Programming                        Functions              16
+## 672              R Programming                            Logic              28
+## 673  Getting and Cleaning Data          Tidying Data with tidyr              57
+## 674  Getting and Cleaning Data     Manipulating Data with dplyr              34
+## 675  Getting and Cleaning Data          Tidying Data with tidyr              56
+## 676              R Programming                        Functions               9
+## 677              R Programming                        Functions              11
+## 678              R Programming                  Looking at Data               4
+## 679              R Programming                            Logic              38
+## 680  Getting and Cleaning Data          Tidying Data with tidyr              48
+## 681              R Programming                        Functions              17
+## 682  Getting and Cleaning Data     Manipulating Data with dplyr              26
+## 683              R Programming                        Functions              14
+## 684  Getting and Cleaning Data     Manipulating Data with dplyr              24
+## 685              R Programming         Matrices and Data Frames              38
+## 686              R Programming                            Logic              30
+## 687  Getting and Cleaning Data     Manipulating Data with dplyr              11
+## 688              R Programming                  Looking at Data               3
+## 689              R Programming         Matrices and Data Frames              39
+## 690  Getting and Cleaning Data     Manipulating Data with dplyr              23
+## 691  Getting and Cleaning Data          Tidying Data with tidyr              53
+## 692  Getting and Cleaning Data          Tidying Data with tidyr              52
+## 693  Getting and Cleaning Data          Tidying Data with tidyr              54
+## 694  Getting and Cleaning Data     Manipulating Data with dplyr              22
+## 695              R Programming                            Logic              38
+## 696  Getting and Cleaning Data     Manipulating Data with dplyr              25
+## 697  Getting and Cleaning Data     Manipulating Data with dplyr              21
+## 698                                                                          NA
+## 699              R Programming         Matrices and Data Frames              21
+## 700              R Programming            Basic Building Blocks              22
+## 701              R Programming            Basic Building Blocks              25
+## 702              R Programming                  Dates and Times               4
+## 703              R Programming            Basic Building Blocks              27
+## 704              R Programming            Basic Building Blocks              23
+## 705              R Programming            Basic Building Blocks              26
+## 706              R Programming                        Functions               5
+## 707              R Programming            Basic Building Blocks              18
+## 708              R Programming            Basic Building Blocks              21
+## 709              R Programming                  Dates and Times               3
+## 710              R Programming                          Vectors               6
+## 711              R Programming                          Vectors               7
+## 712              R Programming                          Vectors               7
+## 713              R Programming                          Vectors               5
+## 714              R Programming                          Vectors              11
+## 715              R Programming                          Vectors              17
+## 716              R Programming                          Vectors              18
+## 717              R Programming            Basic Building Blocks              15
+## 718              R Programming            Basic Building Blocks              16
+## 719              R Programming            Basic Building Blocks              17
+## 720              R Programming                        Functions               3
+## 721              R Programming              Workspace and Files              25
+## 722                          R                                               NA
+## 723              R Programming                  Dates and Times              17
+## 724              R Programming                        Functions               8
+## 725              R Programming               Subsetting Vectors               3
+## 726              R Programming                          Vectors               8
+## 727              R Programming            Basic Building Blocks               3
+## 728              R Programming            Basic Building Blocks               8
+## 729              R Programming            Basic Building Blocks              10
+## 730              R Programming            Basic Building Blocks              11
+## 731              R Programming            Basic Building Blocks              12
+## 732              R Programming            Basic Building Blocks              14
+## 733              R Programming                        Functions              13
+## 734              R Programming                        Functions              14
+## 735              R Programming                        Functions              16
+## 736              R Programming              Workspace and Files              23
+## 737              R Programming                  Dates and Times              18
+## 738              R Programming                  Dates and Times              19
+## 739              R Programming                  Dates and Times              20
+## 740              R Programming                  Dates and Times              22
+## 741              R Programming                          Vectors              11
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+## 743              R Programming                          Vectors              18
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+## 745              R Programming                  Dates and Times              12
+## 746              R Programming                  Dates and Times              13
+## 747              R Programming         Matrices and Data Frames              18
+## 748              R Programming              Workspace and Files              22
+## 749              R Programming                  Dates and Times              16
+## 750              R Programming                            Logic               9
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+## 752              R Programming                        Functions               9
+## 753              R Programming                  Dates and Times               5
+## 754              R Programming                  Dates and Times               7
+## 755              R Programming                  Dates and Times               8
+## 756              R Programming                  Dates and Times               9
+## 757              R Programming                  Dates and Times              11
+## 758              R Programming                            Logic              15
+## 759              R Programming                          Vectors              18
+## 760              R Programming                  Dates and Times              14
+## 761              R Programming                  Dates and Times              15
+## 762              R Programming                        Functions              13
+## 763              R Programming                        Functions              13
+## 764              R Programming                   Missing Values               7
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+## 767              R Programming                            Logic              13
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+## 769              R Programming                            Logic              15
+## 770              R Programming                            Logic              15
+## 771              R Programming                          Vectors              33
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+## 773              R Programming         Matrices and Data Frames              17
+## 774              R Programming              Workspace and Files              21
+## 775              R Programming                          Vectors              28
+## 776              R Programming                          Vectors              29
+## 777              R Programming                          Vectors              30
+## 778              R Programming                   Missing Values               8
+## 779              R Programming                   Missing Values               9
+## 780              R Programming                        Functions              11
+## 781              R Programming                        Functions              13
+## 782              R Programming                        Functions              13
+## 783              R Programming                        Functions              13
+## 784              R Programming                        Functions              13
+## 785              R Programming                        Functions              13
+## 786              R Programming                        Functions              13
+## 787              R Programming                        Functions              13
+## 788              R Programming                   Missing Values               3
+## 789              R Programming                   Missing Values               4
+## 790              R Programming                   Missing Values               6
+## 791              R Programming                          Vectors              32
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+## 793              R Programming                          Vectors               5
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+## 796              R Programming            Basic Building Blocks               8
+## 797              R Programming            Basic Building Blocks              10
+## 798              R Programming            Basic Building Blocks              11
+## 799              R Programming            Basic Building Blocks              12
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+## 801              R Programming            Basic Building Blocks              14
+## 802              R Programming            Basic Building Blocks              15
+## 803              R Programming            Basic Building Blocks              16
+## 804              R Programming                            Logic               7
+## 805              R Programming               Subsetting Vectors              14
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+## 807              R Programming                          Vectors              35
+## 808              R Programming                          Vectors              35
+## 809              R Programming                          Vectors              32
+## 810              R Programming                          Vectors              33
+## 811              R Programming         Matrices and Data Frames              14
+## 812              R Programming            Basic Building Blocks              NA
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+## 814              R Programming            Basic Building Blocks              22
+## 815              R Programming                            Logic               4
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+## 817              R Programming                          Vectors              19
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+## 819              R Programming               Subsetting Vectors              15
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+## 822              R Programming               Subsetting Vectors               8
+## 823              R Programming               Subsetting Vectors               8
+## 824              R Programming               Subsetting Vectors               8
+## 825              R Programming               Subsetting Vectors               8
+## 826              R Programming               Subsetting Vectors               9
+## 827              R Programming                            Logic              27
+## 828              R Programming              Workspace and Files               5
+## 829              R Programming              Workspace and Files               6
+## 830              R Programming                            Logic               7
+## 831              R Programming               Subsetting Vectors              13
+## 832              R Programming                          Vectors              23
+## 833              R Programming                          Vectors              25
+## 834              R Programming                   Missing Values              12
+## 835              R Programming                   Missing Values              17
+## 836              R Programming                   Missing Values              18
+## 837              R Programming                   Missing Values              19
+## 838              R Programming                   Missing Values              20
+## 839              R Programming                   Missing Values              21
+## 840              R Programming              Workspace and Files               9
+## 841              R Programming              Workspace and Files              10
+## 842              R Programming              Workspace and Files              11
+## 843              R Programming              Workspace and Files               8
+## 844              R Programming                          Vectors              29
+## 845              R Programming                          Vectors              30
+## 846              R Programming         Matrices and Data Frames              13
+## 847              R Programming                          Vectors              28
+## 848              R Programming              Workspace and Files              17
+## 849              R Programming               Subsetting Vectors              11
+## 850              R Programming                          Vectors              23
+## 851              R Programming            Basic Building Blocks              25
+## 852              R Programming               Subsetting Vectors              10
+## 853              R Programming               Subsetting Vectors              21
+## 854              R Programming                          Vectors               6
+## 855              R Programming         Matrices and Data Frames               3
+## 856              R Programming               Subsetting Vectors              17
+## 857              R Programming              Workspace and Files              15
+## 858              R Programming                          Vectors              22
+## 859              R Programming                          Vectors               7
+## 860              R Programming                          Vectors               8
+## 861              R Programming                   Missing Values              22
+## 862              R Programming         Matrices and Data Frames               7
+## 863              R Programming                   Missing Values              23
+## 864              R Programming                            Logic              17
+## 865              R Programming         Matrices and Data Frames               6
+## 866                        R P                                               NA
+## 867              R Programming         Matrices and Data Frames               9
+## 868              R Programming         Matrices and Data Frames              10
+## 869              R Programming            Basic Building Blocks              23
+## 870              R Programming         Matrices and Data Frames               3
+## 871              R Programming            Basic Building Blocks              17
+## 872              R Programming            Basic Building Blocks              18
+## 873              R Programming               Subsetting Vectors              21
+## 874              R Programming               Subsetting Vectors              21
+## 875              R Programming         Matrices and Data Frames              12
+## 876              R Programming                            Logic              20
+## 877              R Programming         Matrices and Data Frames               4
+## 878              R Programming            Basic Building Blocks              21
+## 879              R Programming                            Logic              18
+## 880              R Programming              Workspace and Files              15
+## 881              R Programming                            Logic              23
+## 882              R Programming            Basic Building Blocks              21
+## 883              R Programming              Workspace and Files              14
+## 884              R Programming              Workspace and Files              14
+## 885              R Programming         Matrices and Data Frames               5
+## 886              R Programming                            Logic              21
+## 887              R Programming                  Dates and Times              17
+## 888              R Programming            Basic Building Blocks              21
+## 889              R Programming                  Dates and Times              18
+## 890              R Programming            Basic Building Blocks              21
+## 891              R Programming                  Dates and Times              11
+## 892              R Programming               Subsetting Vectors              33
+## 893              R Programming               Subsetting Vectors              34
+## 894              R Programming               Subsetting Vectors              36
+## 895              R Programming            Basic Building Blocks              18
+## 896              R Programming               Subsetting Vectors              15
+## 897              R Programming            Basic Building Blocks              17
+## 898              R Programming                  Dates and Times               9
+## 899              R Programming              Workspace and Files              19
+## 900              R Programming               Subsetting Vectors              41
+## 901              R Programming              Workspace and Files              15
+## 902              R Programming                        Functions              50
+## 903              R Programming                  Dates and Times              12
+## 904              R Programming               Subsetting Vectors              32
+## 905              R Programming            Basic Building Blocks              16
+## 906              R Programming                   Missing Values               7
+## 907              R Programming                  Dates and Times              16
+## 908              R Programming                  Dates and Times              16
+## 909              R Programming                          Vectors              17
+## 910              R Programming                          Vectors              18
+## 911              R Programming                  Dates and Times              19
+## 912              R Programming               Subsetting Vectors              37
+## 913              R Programming               Subsetting Vectors              38
+## 914              R Programming               Subsetting Vectors              42
+## 915              R Programming                            Logic               4
+## 916              R Programming                  Dates and Times               8
+## 917              R Programming               Subsetting Vectors              31
+## 918              R Programming                        Functions              48
+## 919              R Programming                  Dates and Times              15
+## 920              R Programming                            Logic              37
+## 921              R Programming                            Logic              38
+## 922              R Programming              Workspace and Files              14
+## 923              R Programming              Workspace and Files              15
+## 924              R Programming                          Vectors              18
+## 925              R Programming              Workspace and Files              17
+## 926              R Programming               Subsetting Vectors              13
+## 927              R Programming               Subsetting Vectors              40
+## 928              R Programming                  Dates and Times               7
+## 929              R Programming                            Logic              20
+## 930              R Programming              Workspace and Files               6
+## 931              R Programming              Workspace and Files               8
+## 932              R Programming            Basic Building Blocks              15
+## 933              R Programming                  Dates and Times              14
+## 934              R Programming              Workspace and Files              14
+## 935              R Programming               Subsetting Vectors              14
+## 936              R Programming                            Logic              30
+## 937              R Programming                        Functions              16
+## 938              R Programming               Subsetting Vectors              21
+## 939              R Programming               Subsetting Vectors              22
+## 940              R Programming              Workspace and Files              21
+## 941              R Programming                  Dates and Times              20
+## 942              R Programming               Subsetting Vectors              26
+## 943              R Programming               Subsetting Vectors              27
+## 944              R Programming               Subsetting Vectors              29
+## 945              R Programming                  Dates and Times              13
+## 946              R Programming                        Functions              47
+## 947              R Programming                   Missing Values               6
+## 948              R Programming                        Functions               8
+## 949              R Programming                        Functions               8
+## 950              R Programming                   Missing Values               8
+## 951              R Programming                   Missing Values               9
+## 952              R Programming                          Vectors              19
+## 953              R Programming                  Dates and Times               3
+## 954              R Programming                  Dates and Times               4
+## 955              R Programming                  Dates and Times               5
+## 956              R Programming            Basic Building Blocks              25
+## 957              R Programming              Workspace and Files               5
+## 958              R Programming               Subsetting Vectors              30
+## 959              R Programming            Basic Building Blocks              33
+## 960              R Programming                            Logic               6
+## 961              R Programming                            Logic               7
+## 962              R Programming                            Logic               9
+## 963              R Programming                            Logic               9
+## 964              R Programming                            Logic              10
+## 965              R Programming                            Logic              12
+## 966              R Programming                            Logic              13
+## 967              R Programming                            Logic              14
+## 968              R Programming               Subsetting Vectors              13
+## 969              R Programming                  Dates and Times              22
+## 970              R Programming                  Dates and Times              23
+## 971              R Programming            Basic Building Blocks              31
+## 972              R Programming               Subsetting Vectors              13
+## 973              R Programming               Subsetting Vectors              13
+## 974              R Programming               Subsetting Vectors              13
+## 975              R Programming               Subsetting Vectors              13
+## 976              R Programming              Workspace and Files              32
+## 977              R Programming              Workspace and Files              33
+## 978              R Programming               Subsetting Vectors              17
+## 979              R Programming              Workspace and Files              35
+## 980              R Programming            Basic Building Blocks               3
+## 981              R Programming               Subsetting Vectors              23
+## 982              R Programming                          Vectors               7
+## 983              R Programming                          Vectors               8
+## 984              R Programming                          Vectors              11
+## 985              R Programming            Basic Building Blocks              14
+## 986              R Programming                            Logic              36
+## 987              R Programming                        Functions               5
+## 988              R Programming                   Missing Values               3
+## 989              R Programming            Basic Building Blocks              39
+## 990              R Programming                            Logic              39
+## 991              R Programming                            Logic              41
+## 992              R Programming                        Functions              51
+## 993              R Programming            Basic Building Blocks              22
+## 994              R Programming            Basic Building Blocks              22
+## 995              R Programming            Basic Building Blocks              23
+## 996              R Programming                   Missing Values              19
+## 997              R Programming            Basic Building Blocks              27
+## 998              R Programming                   Missing Values              21
+## 999              R Programming                   Missing Values              22
+## 1000             R Programming            Basic Building Blocks              36
+## 1001             R Programming            Basic Building Blocks              38
+## 1002             R Programming              Workspace and Files              31
+## 1003             R Programming            Basic Building Blocks              40
+## 1004             R Programming            Basic Building Blocks              41
+## 1005             R Programming                        Functions              13
+## 1006             R Programming                        Functions              17
+## 1007             R Programming               Subsetting Vectors              11
+## 1008             R Programming                            Logic              15
+## 1009             R Programming               Subsetting Vectors              13
+## 1010             R Programming               Subsetting Vectors              13
+## 1011             R Programming                            Logic              21
+## 1012             R Programming               Subsetting Vectors              13
+## 1013             R Programming                            Logic              27
+## 1014             R Programming               Subsetting Vectors              13
+## 1015             R Programming               Subsetting Vectors               3
+## 1016             R Programming                  Dates and Times              28
+## 1017             R Programming                  Dates and Times              29
+## 1018             R Programming              Workspace and Files              34
+## 1019             R Programming                  Dates and Times              32
+## 1020             R Programming              Workspace and Files              40
+## 1021             R Programming            Basic Building Blocks               8
+## 1022             R Programming            Basic Building Blocks              10
+## 1023             R Programming            Basic Building Blocks              11
+## 1024             R Programming            Basic Building Blocks              12
+## 1025             R Programming                        Functions              43
+## 1026             R Programming                   Missing Values               4
+## 1027             R Programming                        Functions              42
+## 1028             R Programming              Workspace and Files              31
+## 1029             R Programming               Subsetting Vectors               5
+## 1030             R Programming               Subsetting Vectors               8
+## 1031             R Programming                        Functions               8
+## 1032             R Programming                            Logic              41
+## 1033             R Programming                        Functions              52
+## 1034             R Programming                   Missing Values              17
+## 1035             R Programming                   Missing Values              18
+## 1036             R Programming                            Logic              43
+## 1037             R Programming                   Missing Values              20
+## 1038             R Programming            Basic Building Blocks              25
+## 1039             R Programming            Basic Building Blocks              26
+## 1040             R Programming                   Missing Values              23
+## 1041             R Programming                        Functions              41
+## 1042             R Programming                  Dates and Times              27
+## 1043             R Programming                        Functions              25
+## 1044             R Programming               Subsetting Vectors               8
+## 1045             R Programming               Subsetting Vectors               9
+## 1046             R Programming               Subsetting Vectors              10
+## 1047             R Programming                        Functions              14
+## 1048             R Programming                        Functions              19
+## 1049             R Programming              Workspace and Files              22
+## 1050             R Programming              Workspace and Files              23
+## 1051             R Programming               Subsetting Vectors              13
+## 1052             R Programming                            Logic              23
+## 1053             R Programming              Workspace and Files              29
+## 1054             R Programming                        Functions               8
+## 1055             R Programming                        Functions               9
+## 1056             R Programming              Workspace and Files               9
+## 1057             R Programming                        Functions              27
+## 1058             R Programming                            Logic              28
+## 1059             R Programming                  Dates and Times              30
+## 1060             R Programming                            Logic              32
+## 1061             R Programming              Workspace and Files              41
+## 1062             R Programming              Workspace and Files              42
+## 1063             R Programming                          Vectors               5
+## 1064             R Programming                          Vectors               6
+## 1065             R Programming                            Logic              35
+## 1066             R Programming                        Functions               5
+## 1067             R Programming                        Functions               3
+## 1068             R Programming                  Dates and Times              24
+## 1069             R Programming                        Functions              23
+## 1070             R Programming              Workspace and Files              10
+## 1071             R Programming              Workspace and Files              11
+## 1072             R Programming                        Functions               8
+## 1073             R Programming                            Logic              41
+## 1074             R Programming                            Logic              41
+## 1075             R Programming                            Logic              42
+## 1076             R Programming                        Functions               8
+## 1077             R Programming                            Logic              44
+## 1078             R Programming                        Functions               8
+## 1079             R Programming                        Functions               8
+## 1080             R Programming                          Vectors              25
+## 1081             R Programming                        Functions               8
+## 1082             R Programming                        Functions               8
+## 1083             R Programming                        Functions              11
+## 1084             R Programming                        Functions              13
+## 1085             R Programming                        Functions              13
+## 1086             R Programming                          Vectors              41
+## 1087             R Programming                          Vectors              40
+## 1088             R Programming                            Logic              55
+## 1089             R Programming                            Logic              32
+## 1090             R Programming                            Logic              15
+## 1091             R Programming              Workspace and Files              25
+## 1092             R Programming               Subsetting Vectors              13
+## 1093             R Programming              Workspace and Files              27
+## 1094             R Programming                        Functions              40
+## 1095             R Programming                          Vectors              28
+## 1096             R Programming                        Functions              23
+## 1097             R Programming                        Functions               8
+## 1098             R Programming                        Functions              27
+## 1099             R Programming                        Functions              28
+## 1100             R Programming                   Missing Values              10
+## 1101             R Programming                            Logic              32
+## 1102             R Programming                        Functions               8
+## 1103             R Programming                            Logic              32
+## 1104             R Programming                            Logic              33
+## 1105             R Programming                            Logic              33
+## 1106             R Programming                  Dates and Times              39
+## 1107             R Programming                            Logic              18
+## 1108             R Programming                        Functions              40
+## 1109             R Programming                          Vectors              29
+## 1110             R Programming                   Missing Values              12
+## 1111             R Programming                        Functions              13
+## 1112             R Programming                          Vectors              35
+## 1113             R Programming                          Vectors              39
+## 1114             R Programming                          Vectors              23
+## 1115             R Programming                            Logic              54
+## 1116             R Programming                  Dates and Times              35
+## 1117             R Programming                        Functions               8
+## 1118             R Programming                            Logic              50
+## 1119             R Programming                            Logic              17
+## 1120             R Programming                        Functions              38
+## 1121             R Programming                          Vectors              33
+## 1122             R Programming                        Functions              21
+## 1123             R Programming                            Logic              53
+## 1124             R Programming                          Vectors              33
+## 1125             R Programming                        Functions              32
+## 1126             R Programming                          Vectors              32
+## 1127             R Programming               Subsetting Vectors              13
+## 1128             R Programming                  Dates and Times              33
+## 1129             R Programming                          Vectors              30
+## 1130             R Programming                            Logic              47
+## 1131             R Programming                            Logic              49
+## 1132             R Programming                        Functions              36
+## 1133             R Programming                        Functions               8
+## 1134             R Programming                        Functions              35
+## 1135             R Programming                  Dates and Times              37
+## 1136             R Programming                        Functions               8
+## 1137             R Programming                            Logic              51
+## 1138             R Programming                            Logic              46
+## 1139             R Programming                  Dates and Times              38
+## 1140             R Programming                          Vectors              22
+## 1141             R Programming                            Logic              46
+## 1142             R Programming                        Functions              34
+## 1143             R Programming            Basic Building Blocks              18
+## 1144             R Programming            Basic Building Blocks              41
+## 1145             R Programming            Basic Building Blocks              40
+## 1146             R Programming            Basic Building Blocks              21
+## 1147             R Programming            Basic Building Blocks              18
+## 1148             R Programming            Basic Building Blocks              17
+## 1149             R Programming            Basic Building Blocks              17
+## 1150             R Programming            Basic Building Blocks              33
+## 1151             R Programming            Basic Building Blocks              15
+## 1152             R Programming            Basic Building Blocks               3
+## 1153             R Programming            Basic Building Blocks              38
+## 1154             R Programming            Basic Building Blocks              39
+## 1155             R Programming            Basic Building Blocks              36
+## 1156             R Programming            Basic Building Blocks              14
+## 1157             R Programming            Basic Building Blocks              16
+## 1158             R Programming            Basic Building Blocks              15
+## 1159             R Programming            Basic Building Blocks               8
+## 1160             R Programming            Basic Building Blocks              36
+## 1161             R Programming            Basic Building Blocks              26
+## 1162             R Programming            Basic Building Blocks              10
+## 1163             R Programming            Basic Building Blocks              31
+## 1164             R Programming            Basic Building Blocks              11
+## 1165             R Programming            Basic Building Blocks              12
+## 1166             R Programming            Basic Building Blocks              15
+## 1167             R Programming            Basic Building Blocks              22
+## 1168             R Programming            Basic Building Blocks              27
+## 1169             R Programming            Basic Building Blocks              25
+## 1170             R Programming            Basic Building Blocks              14
+## 1171             R Programming            Basic Building Blocks              23
+## 1172             R Programming              Workspace and Files              27
+## 1173             R Programming              Workspace and Files              23
+## 1174             R Programming              Workspace and Files              14
+## 1175             R Programming              Workspace and Files              25
+## 1176             R Programming              Workspace and Files               9
+## 1177             R Programming              Workspace and Files              15
+## 1178             R Programming              Workspace and Files               8
+## 1179             R Programming              Workspace and Files              22
+## 1180             R Programming              Workspace and Files              15
+## 1181             R Programming              Workspace and Files              42
+## 1182             R Programming              Workspace and Files              41
+## 1183             R Programming              Workspace and Files              17
+## 1184             R Programming              Workspace and Files              17
+## 1185             R Programming              Workspace and Files              11
+## 1186             R Programming              Workspace and Files              10
+## 1187             R Programming              Workspace and Files               6
+## 1188             R Programming              Workspace and Files              21
+## 1189             R Programming              Workspace and Files              33
+## 1190             R Programming              Workspace and Files              40
+## 1191             R Programming              Workspace and Files              31
+## 1192             R Programming              Workspace and Files              31
+## 1193             R Programming              Workspace and Files              32
+## 1194             R Programming              Workspace and Files              29
+## 1195             R Programming              Workspace and Files               5
+## 1196             R Programming              Workspace and Files              19
+## 1197             R Programming              Workspace and Files              35
+## 1198             R Programming              Workspace and Files              34
+## 1199             R Programming              Workspace and Files              34
+## 1200             R Programming              Workspace and Files              14
+## 1201             R Programming              Workspace and Files              14
+## 1202             R Programming              Workspace and Files              15
+## 1203             R Programming                  Dates and Times              17
+## 1204             R Programming                  Dates and Times              18
+## 1205             R Programming                  Dates and Times              19
+## 1206             R Programming                  Dates and Times              20
+## 1207             R Programming              Workspace and Files              15
+## 1208             R Programming              Workspace and Files              17
+## 1209             R Programming              Workspace and Files              17
+## 1210             R Programming              Workspace and Files              19
+## 1211             R Programming              Workspace and Files              19
+## 1212             R Programming              Workspace and Files              21
+## 1213             R Programming              Workspace and Files              21
+## 1214             R Programming                  Dates and Times              16
+## 1215             R Programming                  Dates and Times              16
+## 1216             R Programming              Workspace and Files              10
+## 1217             R Programming              Workspace and Files              11
+## 1218             R Programming                          Vectors              33
+## 1219             R Programming                          Vectors              33
+## 1220             R Programming                   Missing Values               3
+## 1221             R Programming                   Missing Values               4
+## 1222             R Programming                   Missing Values               6
+## 1223             R Programming                   Missing Values               7
+## 1224             R Programming                   Missing Values               8
+## 1225             R Programming                   Missing Values               9
+## 1226             R Programming                   Missing Values              10
+## 1227             R Programming                   Missing Values              12
+## 1228             R Programming                   Missing Values              17
+## 1229             R Programming                   Missing Values              18
+## 1230             R Programming                   Missing Values              19
+## 1231             R Programming                   Missing Values              20
+## 1232             R Programming                   Missing Values              21
+## 1233             R Programming                   Missing Values              22
+## 1234             R Programming            Basic Building Blocks              27
+## 1235             R Programming                   Missing Values              23
+## 1236             R Programming               Subsetting Vectors               3
+## 1237             R Programming                            Logic               4
+## 1238             R Programming                            Logic               6
+## 1239             R Programming                            Logic               7
+## 1240             R Programming                            Logic               9
+## 1241             R Programming                            Logic              10
+## 1242             R Programming                            Logic              12
+## 1243             R Programming                            Logic              13
+## 1244             R Programming                            Logic              14
+## 1245             R Programming                            Logic              15
+## 1246             R Programming                            Logic              17
+## 1247             R Programming                            Logic              18
+## 1248             R Programming                            Logic              20
+## 1249             R Programming                            Logic              21
+## 1250             R Programming                            Logic              23
+## 1251             R Programming                            Logic              27
+## 1252             R Programming              Workspace and Files               5
+## 1253             R Programming              Workspace and Files               6
+## 1254             R Programming              Workspace and Files               8
+## 1255             R Programming              Workspace and Files               9
+## 1256             R Programming                            Logic              33
+## 1257                                                                         NA
+## 1258             R Programming                  Dates and Times               3
+## 1259             R Programming                  Dates and Times               4
+## 1260             R Programming                  Dates and Times               5
+## 1261             R Programming                  Dates and Times               7
+## 1262             R Programming                  Dates and Times               8
+## 1263             R Programming                  Dates and Times               9
+## 1264             R Programming                  Dates and Times              11
+## 1265             R Programming                  Dates and Times              12
+## 1266             R Programming                  Dates and Times              13
+## 1267             R Programming                  Dates and Times              14
+## 1268             R Programming                  Dates and Times              15
+## 1269             R Programming            Basic Building Blocks              21
+## 1270             R Programming            Basic Building Blocks              22
+## 1271             R Programming            Basic Building Blocks              23
+## 1272             R Programming            Basic Building Blocks              25
+## 1273             R Programming            Basic Building Blocks              26
+## 1274             R Programming                          Vectors              11
+## 1275             R Programming                          Vectors              17
+## 1276             R Programming                          Vectors              18
+## 1277             R Programming               Subsetting Vectors               5
+## 1278             R Programming               Subsetting Vectors               8
+## 1279             R Programming               Subsetting Vectors               9
+## 1280             R Programming               Subsetting Vectors              10
+## 1281             R Programming                          Vectors               5
+## 1282             R Programming                          Vectors               5
+## 1283             R Programming                          Vectors               6
+## 1284             R Programming                          Vectors               7
+## 1285             R Programming                          Vectors               7
+## 1286             R Programming                          Vectors               8
+## 1287             R Programming            Basic Building Blocks               8
+## 1288             R Programming            Basic Building Blocks              10
+## 1289             R Programming            Basic Building Blocks              11
+## 1290             R Programming                          Vectors              19
+## 1291                      R Pr                                               NA
+## 1292             R Programming                          Vectors              22
+## 1293             R Programming                            Logic              28
+## 1294             R Programming                            Logic              30
+## 1295             R Programming                            Logic              32
+## 1296             R Programming                          Vectors              29
+## 1297             R Programming                          Vectors              30
+## 1298             R Programming                          Vectors              32
+## 1299             R Programming            Basic Building Blocks               3
+## 1300             R Programming               Subsetting Vectors              21
+## 1301             R Programming               Subsetting Vectors              22
+## 1302             R Programming               Subsetting Vectors              23
+## 1303             R Programming            Basic Building Blocks              12
+## 1304             R Programming            Basic Building Blocks              14
+## 1305             R Programming            Basic Building Blocks              15
+## 1306             R Programming            Basic Building Blocks              16
+## 1307             R Programming            Basic Building Blocks              17
+## 1308             R Programming            Basic Building Blocks              18
+## 1309             R Programming               Subsetting Vectors              13
+## 1310             R Programming               Subsetting Vectors              14
+## 1311             R Programming               Subsetting Vectors              15
+## 1312             R Programming               Subsetting Vectors              17
+## 1313             R Programming               Subsetting Vectors              26
+## 1314             R Programming               Subsetting Vectors              27
+## 1315             R Programming               Subsetting Vectors              26
+## 1316             R Programming               Subsetting Vectors              11
+## 1317             R Programming                          Vectors              28
+## 1318             R Programming                          Vectors              23
+## 1319             R Programming                          Vectors              25
+## 1320             R Programming              Workspace and Files              31
+## 1321             R Programming                  Looking at Data              16
+## 1322             R Programming              Workspace and Files              23
+## 1323 Getting and Cleaning Data Grouping and Chaining with dplyr              32
+## 1324 Getting and Cleaning Data Grouping and Chaining with dplyr              10
+## 1325             R Programming                  Looking at Data              15
+## 1326             R Programming              Workspace and Files              41
+## 1327             R Programming                  Looking at Data              16
+## 1328             R Programming                  Looking at Data              13
+## 1329 Getting and Cleaning Data Grouping and Chaining with dplyr               9
+## 1330 Getting and Cleaning Data Grouping and Chaining with dplyr              14
+## 1331             R Programming              Workspace and Files              42
+## 1332 Getting and Cleaning Data Grouping and Chaining with dplyr              14
+## 1333 Getting and Cleaning Data Grouping and Chaining with dplyr              33
+## 1334 Getting and Cleaning Data Grouping and Chaining with dplyr              39
+## 1335 Getting and Cleaning Data Grouping and Chaining with dplyr              33
+## 1336 Getting and Cleaning Data Grouping and Chaining with dplyr              11
+## 1337             R Programming                  Looking at Data              11
+## 1338             R Programming                  Looking at Data              10
+## 1339             R Programming              Workspace and Files               9
+## 1340             R Programming              Workspace and Files               9
+## 1341 Getting and Cleaning Data Grouping and Chaining with dplyr              32
+## 1342             R Programming              Workspace and Files              11
+## 1343             R Programming                          Vectors               5
+## 1344             R Programming              Workspace and Files              32
+## 1345             R Programming              Workspace and Files              10
+## 1346             R Programming                          Vectors               6
+## 1347 Getting and Cleaning Data Grouping and Chaining with dplyr              35
+## 1348 Getting and Cleaning Data Grouping and Chaining with dplyr              35
+## 1349 Getting and Cleaning Data Grouping and Chaining with dplyr              34
+## 1350             R Programming                  Looking at Data               9
+## 1351 Getting and Cleaning Data Grouping and Chaining with dplyr               7
+## 1352 Getting and Cleaning Data Grouping and Chaining with dplyr               8
+## 1353             R Programming              Workspace and Files              23
+## 1354             R Programming                  Dates and Times              35
+## 1355             R Programming              Workspace and Files              25
+## 1356             R Programming              Workspace and Files              27
+## 1357             R Programming                          Vectors               6
+## 1358             R Programming                          Vectors               6
+## 1359             R Programming                            Logic              47
+## 1360             R Programming              Workspace and Files              32
+## 1361             R Programming              Workspace and Files              33
+## 1362             R Programming              Workspace and Files              34
+## 1363             R Programming              Workspace and Files              34
+## 1364             R Programming              Workspace and Files              35
+## 1365             R Programming              Workspace and Files              40
+## 1366             R Programming                        Functions              17
+## 1367             R Programming                        Functions              19
+## 1368             R Programming                        Functions              21
+## 1369             R Programming                        Functions              23
+## 1370             R Programming              Workspace and Files              29
+## 1371             R Programming                            Logic              46
+## 1372             R Programming                        Functions              28
+## 1373             R Programming                        Functions              32
+## 1374             R Programming                        Functions              34
+## 1375             R Programming                        Functions              35
+## 1376             R Programming              Workspace and Files               5
+## 1377             R Programming              Workspace and Files               6
+## 1378             R Programming              Workspace and Files               8
+## 1379             R Programming                        Functions              41
+## 1380             R Programming                        Functions              42
+## 1381             R Programming                        Functions              42
+## 1382             R Programming                        Functions              43
+## 1383             R Programming                        Functions              25
+## 1384             R Programming                        Functions              27
+## 1385 Getting and Cleaning Data Grouping and Chaining with dplyr              54
+## 1386 Getting and Cleaning Data Grouping and Chaining with dplyr              55
+## 1387             R Programming                  Looking at Data               3
+## 1388             R Programming                  Looking at Data               4
+## 1389             R Programming                  Looking at Data               6
+## 1390             R Programming                  Looking at Data               8
+## 1391             R Programming              Workspace and Files              21
+## 1392             R Programming              Workspace and Files              22
+## 1393             R Programming                  Dates and Times              33
+## 1394 Getting and Cleaning Data          Tidying Data with tidyr              53
+## 1395 Getting and Cleaning Data          Tidying Data with tidyr              53
+## 1396 Getting and Cleaning Data          Tidying Data with tidyr              54
+## 1397 Getting and Cleaning Data          Tidying Data with tidyr              56
+## 1398 Getting and Cleaning Data          Tidying Data with tidyr              57
+## 1399 Getting and Cleaning Data          Tidying Data with tidyr              58
+## 1400 Getting and Cleaning Data Grouping and Chaining with dplyr              14
+## 1401 Getting and Cleaning Data Grouping and Chaining with dplyr              16
+## 1402 Getting and Cleaning Data Grouping and Chaining with dplyr              17
+## 1403 Getting and Cleaning Data Grouping and Chaining with dplyr              21
+## 1404 Getting and Cleaning Data Grouping and Chaining with dplyr              21
+## 1405 Getting and Cleaning Data Grouping and Chaining with dplyr              22
+## 1406 Getting and Cleaning Data Grouping and Chaining with dplyr              23
+## 1407 Getting and Cleaning Data Grouping and Chaining with dplyr              25
+## 1408 Getting and Cleaning Data Grouping and Chaining with dplyr              26
+## 1409 Getting and Cleaning Data Grouping and Chaining with dplyr              27
+## 1410 Getting and Cleaning Data Grouping and Chaining with dplyr              31
+## 1411 Exploratory_Data_Analysis                 Plotting_Systems              19
+## 1412 Exploratory_Data_Analysis                 Plotting_Systems              20
+## 1413 Exploratory_Data_Analysis                 Plotting_Systems              21
+## 1414 Exploratory_Data_Analysis                 Plotting_Systems              25
+## 1415 Exploratory_Data_Analysis                 Plotting_Systems              26
+## 1416 Exploratory_Data_Analysis                 Plotting_Systems              27
+## 1417 Exploratory_Data_Analysis                 Plotting_Systems              27
+## 1418 Exploratory_Data_Analysis                 Plotting_Systems              28
+## 1419 Getting and Cleaning Data Grouping and Chaining with dplyr              42
+## 1420 Getting and Cleaning Data Grouping and Chaining with dplyr              43
+## 1421 Getting and Cleaning Data Grouping and Chaining with dplyr              45
+## 1422 Getting and Cleaning Data Grouping and Chaining with dplyr              48
+## 1423             R Programming              Workspace and Files              14
+## 1424             R Programming              Workspace and Files              15
+## 1425             R Programming              Workspace and Files              17
+## 1426             R Programming              Workspace and Files              17
+## 1427             R Programming              Workspace and Files              19
+## 1428             R Programming              Workspace and Files              19
+## 1429             R Programming              Workspace and Files              19
+## 1430             R Programming              Workspace and Files              19
+## 1431 Getting and Cleaning Data Grouping and Chaining with dplyr               6
+## 1432 Getting and Cleaning Data          Tidying Data with tidyr              48
+## 1433 Getting and Cleaning Data          Tidying Data with tidyr              52
+## 1434 Getting and Cleaning Data     Manipulating Data with dplyr              10
+## 1435 Getting and Cleaning Data     Manipulating Data with dplyr              11
+## 1436 Getting and Cleaning Data     Manipulating Data with dplyr              11
+## 1437 Getting and Cleaning Data     Manipulating Data with dplyr              12
+## 1438 Getting and Cleaning Data     Manipulating Data with dplyr              16
+## 1439 Getting and Cleaning Data     Manipulating Data with dplyr              18
+## 1440 Getting and Cleaning Data     Manipulating Data with dplyr              21
+## 1441             R Programming                            Logic              49
+## 1442             R Programming                            Logic              50
+## 1443             R Programming                            Logic              51
+## 1444             R Programming                            Logic              53
+## 1445             R Programming                            Logic              54
+## 1446             R Programming                            Logic              55
+## 1447             R Programming                  Dates and Times               3
+## 1448             R Programming                  Dates and Times               4
+## 1449             R Programming                          Vectors               5
+## 1450             R Programming                          Vectors               5
+## 1451             R Programming                  Dates and Times               8
+## 1452             R Programming                  Dates and Times               9
+## 1453             R Programming                  Dates and Times              11
+## 1454             R Programming                  Dates and Times              12
+## 1455             R Programming                          Vectors               7
+## 1456             R Programming                          Vectors               7
+## 1457             R Programming                          Vectors               8
+## 1458             R Programming                          Vectors              11
+## 1459             R Programming                          Vectors              17
+## 1460             R Programming                          Vectors              18
+## 1461             R Programming                          Vectors              19
+## 1462             R Programming                          Vectors              22
+## 1463 Getting and Cleaning Data Grouping and Chaining with dplyr              49
+## 1464 Getting and Cleaning Data Grouping and Chaining with dplyr              50
+## 1465 Getting and Cleaning Data Grouping and Chaining with dplyr              51
+## 1466 Getting and Cleaning Data Grouping and Chaining with dplyr              51
+## 1467 Getting and Cleaning Data Grouping and Chaining with dplyr              53
+## 1468 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 1469 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 1470 Getting and Cleaning Data     Manipulating Data with dplyr               5
+## 1471 Getting and Cleaning Data     Manipulating Data with dplyr               6
+## 1472 Getting and Cleaning Data     Manipulating Data with dplyr               7
+## 1473 Getting and Cleaning Data     Manipulating Data with dplyr               8
+## 1474 Getting and Cleaning Data     Manipulating Data with dplyr              62
+## 1475 Getting and Cleaning Data     Manipulating Data with dplyr              63
+## 1476             R Programming                  Dates and Times              37
+## 1477             R Programming                  Dates and Times              38
+## 1478             R Programming                  Dates and Times              39
+## 1479             R Programming                        Functions               3
+## 1480             R Programming                        Functions               5
+## 1481             R Programming                        Functions               8
+## 1482             R Programming                        Functions               9
+## 1483             R Programming                        Functions              11
+## 1484             R Programming                        Functions              13
+## 1485             R Programming                        Functions              14
+## 1486             R Programming                        Functions              16
+## 1487             R Programming                        Functions              16
+## 1488 Getting and Cleaning Data          Tidying Data with tidyr              25
+## 1489 Getting and Cleaning Data          Tidying Data with tidyr              28
+## 1490 Getting and Cleaning Data          Tidying Data with tidyr              29
+## 1491 Getting and Cleaning Data          Tidying Data with tidyr              30
+## 1492 Getting and Cleaning Data          Tidying Data with tidyr              30
+## 1493 Getting and Cleaning Data          Tidying Data with tidyr              31
+## 1494 Getting and Cleaning Data          Tidying Data with tidyr              32
+## 1495 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 1496 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 1497             R Programming                        Functions              36
+## 1498             R Programming                        Functions              38
+## 1499             R Programming                        Functions              40
+## 1500 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 1501 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 1502 Getting and Cleaning Data          Tidying Data with tidyr              34
+## 1503 Getting and Cleaning Data          Tidying Data with tidyr              37
+## 1504             R Programming                        Functions              47
+## 1505             R Programming                        Functions              48
+## 1506             R Programming                        Functions              48
+## 1507             R Programming                        Functions              50
+## 1508             R Programming                        Functions              51
+## 1509             R Programming                        Functions              52
+## 1510 Getting and Cleaning Data Grouping and Chaining with dplyr               5
+## 1511 Getting and Cleaning Data Grouping and Chaining with dplyr               6
+## 1512 Getting and Cleaning Data          Tidying Data with tidyr              48
+## 1513             R Programming               Subsetting Vectors              23
+## 1514             R Programming               Subsetting Vectors              26
+## 1515             R Programming               Subsetting Vectors              27
+## 1516             R Programming               Subsetting Vectors              29
+## 1517             R Programming               Subsetting Vectors              30
+## 1518             R Programming               Subsetting Vectors              31
+## 1519             R Programming               Subsetting Vectors              32
+## 1520             R Programming               Subsetting Vectors              33
+## 1521             R Programming               Subsetting Vectors              34
+## 1522             R Programming               Subsetting Vectors              36
+## 1523             R Programming               Subsetting Vectors              37
+## 1524 Exploratory_Data_Analysis                 Plotting_Systems               5
+## 1525 Exploratory_Data_Analysis                 Plotting_Systems               7
+## 1526 Exploratory_Data_Analysis                 Plotting_Systems               9
+## 1527 Exploratory_Data_Analysis                 Plotting_Systems              11
+## 1528 Exploratory_Data_Analysis                 Plotting_Systems              11
+## 1529 Exploratory_Data_Analysis                 Plotting_Systems              16
+## 1530 Exploratory_Data_Analysis                 Plotting_Systems              17
+## 1531 Exploratory_Data_Analysis                 Plotting_Systems              19
+## 1532             R Programming                            Logic              10
+## 1533             R Programming                            Logic              12
+## 1534             R Programming                            Logic              13
+## 1535             R Programming                            Logic              14
+## 1536             R Programming                            Logic              14
+## 1537             R Programming                            Logic              15
+## 1538             R Programming                            Logic              17
+## 1539             R Programming                            Logic              18
+## 1540 Exploratory_Data_Analysis                 Plotting_Systems              28
+## 1541 Exploratory_Data_Analysis                 Plotting_Systems              31
+## 1542 Exploratory_Data_Analysis                 Plotting_Systems              32
+## 1543 Exploratory_Data_Analysis                 Plotting_Systems              32
+## 1544 Exploratory_Data_Analysis                 Plotting_Systems              32
+## 1545 Exploratory_Data_Analysis                 Plotting_Systems              32
+## 1546 Exploratory_Data_Analysis                 Plotting_Systems              32
+## 1547 Exploratory_Data_Analysis                 Plotting_Systems              33
+## 1548 Exploratory_Data_Analysis                 Plotting_Systems              34
+## 1549 Exploratory_Data_Analysis                 Plotting_Systems              35
+## 1550 Exploratory_Data_Analysis                 Plotting_Systems              36
+## 1551 Exploratory_Data_Analysis                 Plotting_Systems              36
+## 1552 Exploratory_Data_Analysis                 Plotting_Systems              38
+## 1553 Exploratory_Data_Analysis                 Plotting_Systems              39
+## 1554 Exploratory_Data_Analysis                 Plotting_Systems              40
+## 1555             R Programming                            Logic              39
+## 1556             R Programming                            Logic              41
+## 1557             R Programming                            Logic              41
+## 1558             R Programming                            Logic              42
+## 1559             R Programming                            Logic              43
+## 1560             R Programming                            Logic              44
+## 1561             R Programming                   Missing Values               3
+## 1562             R Programming                   Missing Values               4
+## 1563 Getting and Cleaning Data     Manipulating Data with dplyr              21
+## 1564 Getting and Cleaning Data     Manipulating Data with dplyr              22
+## 1565 Getting and Cleaning Data     Manipulating Data with dplyr              23
+## 1566 Getting and Cleaning Data     Manipulating Data with dplyr              23
+## 1567 Getting and Cleaning Data     Manipulating Data with dplyr              24
+## 1568 Getting and Cleaning Data     Manipulating Data with dplyr              25
+## 1569 Getting and Cleaning Data     Manipulating Data with dplyr              26
+## 1570             R Programming                  Dates and Times               5
+## 1571             R Programming                  Dates and Times               7
+## 1572 Getting and Cleaning Data     Manipulating Data with dplyr              30
+## 1573 Getting and Cleaning Data     Manipulating Data with dplyr              33
+## 1574 Getting and Cleaning Data     Manipulating Data with dplyr              34
+## 1575 Getting and Cleaning Data     Manipulating Data with dplyr              35
+## 1576 Getting and Cleaning Data     Manipulating Data with dplyr              35
+## 1577             R Programming                  Dates and Times              13
+## 1578             R Programming                  Dates and Times              14
+## 1579             R Programming                  Dates and Times              15
+## 1580             R Programming                  Dates and Times              15
+## 1581             R Programming                  Dates and Times              16
+## 1582             R Programming                  Dates and Times              17
+## 1583             R Programming                  Dates and Times              18
+## 1584             R Programming                  Dates and Times              19
+## 1585             R Programming                          Vectors              22
+## 1586             R Programming                          Vectors              23
+## 1587             R Programming                          Vectors              25
+## 1588             R Programming                          Vectors              25
+## 1589             R Programming                          Vectors              28
+## 1590             R Programming                          Vectors              28
+## 1591             R Programming                          Vectors              29
+## 1592             R Programming                          Vectors              30
+## 1593             R Programming                          Vectors              32
+## 1594             R Programming                          Vectors              33
+## 1595             R Programming                          Vectors              33
+## 1596             R Programming                          Vectors              33
+## 1597             R Programming                          Vectors              35
+## 1598             R Programming                          Vectors              39
+## 1599             R Programming                          Vectors              40
+## 1600             R Programming                          Vectors              41
+## 1601 Getting and Cleaning Data          Tidying Data with tidyr              12
+## 1602 Getting and Cleaning Data          Tidying Data with tidyr              15
+## 1603             R Programming                   Missing Values               6
+## 1604             R Programming                   Missing Values               7
+## 1605             R Programming                   Missing Values               8
+## 1606             R Programming                   Missing Values               8
+## 1607             R Programming                   Missing Values               9
+## 1608             R Programming                   Missing Values              10
+## 1609             R Programming                   Missing Values              12
+## 1610             R Programming                   Missing Values              17
+## 1611             R Programming                   Missing Values              17
+## 1612             R Programming                   Missing Values              17
+## 1613             R Programming                   Missing Values              18
+## 1614             R Programming                   Missing Values              19
+## 1615             R Programming                   Missing Values              20
+## 1616             R Programming                   Missing Values              21
+## 1617             R Programming                   Missing Values              22
+## 1618 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 1619 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 1620 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 1621             R Programming               Subsetting Vectors               8
+## 1622             R Programming               Subsetting Vectors               9
+## 1623             R Programming               Subsetting Vectors              10
+## 1624             R Programming               Subsetting Vectors              10
+## 1625 Getting and Cleaning Data          Tidying Data with tidyr              38
+## 1626 Getting and Cleaning Data          Tidying Data with tidyr              39
+## 1627 Getting and Cleaning Data          Tidying Data with tidyr              42
+## 1628 Getting and Cleaning Data          Tidying Data with tidyr              43
+## 1629 Getting and Cleaning Data          Tidying Data with tidyr              46
+## 1630 Getting and Cleaning Data          Tidying Data with tidyr              46
+## 1631 Getting and Cleaning Data          Tidying Data with tidyr              46
+## 1632 Getting and Cleaning Data          Tidying Data with tidyr              47
+## 1633             R Programming               Subsetting Vectors              22
+## 1634             R Programming                            Logic              37
+## 1635             R Programming                            Logic              38
+## 1636             R Programming                  Dates and Times              32
+## 1637 Getting and Cleaning Data          Tidying Data with tidyr               3
+## 1638 Getting and Cleaning Data          Tidying Data with tidyr               6
+## 1639 Getting and Cleaning Data          Tidying Data with tidyr               8
+## 1640 Getting and Cleaning Data          Tidying Data with tidyr              11
+## 1641 Getting and Cleaning Data     Manipulating Data with dplyr              30
+## 1642             R Programming                            Logic              33
+## 1643 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 1644 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 1645             R Programming               Subsetting Vectors              38
+## 1646             R Programming               Subsetting Vectors              40
+## 1647             R Programming               Subsetting Vectors              41
+## 1648             R Programming               Subsetting Vectors              42
+## 1649             R Programming                            Logic               4
+## 1650             R Programming                            Logic               6
+## 1651             R Programming                            Logic               7
+## 1652             R Programming                            Logic               9
+## 1653 Getting and Cleaning Data     Manipulating Data with dplyr              28
+## 1654             R Programming                            Logic              32
+## 1655             R Programming                  Dates and Times              22
+## 1656             R Programming                            Logic              33
+## 1657             R Programming                            Logic              33
+## 1658 Getting and Cleaning Data     Manipulating Data with dplyr              36
+## 1659 Getting and Cleaning Data     Manipulating Data with dplyr              37
+## 1660 Getting and Cleaning Data     Manipulating Data with dplyr              37
+## 1661             R Programming                            Logic              20
+## 1662             R Programming                            Logic              21
+## 1663             R Programming                            Logic              23
+## 1664             R Programming                            Logic              27
+## 1665             R Programming                            Logic              28
+## 1666             R Programming                            Logic              30
+## 1667             R Programming                  Dates and Times              20
+## 1668             R Programming               Subsetting Vectors              11
+## 1669             R Programming                  Dates and Times              23
+## 1670             R Programming                  Dates and Times              23
+## 1671             R Programming                            Logic              35
+## 1672             R Programming                            Logic              36
+## 1673             R Programming                            Logic              37
+## 1674             R Programming                  Dates and Times              29
+## 1675             R Programming                  Dates and Times              30
+## 1676 Getting and Cleaning Data     Manipulating Data with dplyr              57
+## 1677 Getting and Cleaning Data     Manipulating Data with dplyr              61
+## 1678             R Programming                  Looking at Data              28
+## 1679 Getting and Cleaning Data     Manipulating Data with dplyr              27
+## 1680             R Programming                  Dates and Times              24
+## 1681 Getting and Cleaning Data          Tidying Data with tidyr              19
+## 1682             R Programming               Subsetting Vectors              13
+## 1683             R Programming               Subsetting Vectors              14
+## 1684             R Programming                  Looking at Data              22
+## 1685             R Programming                  Looking at Data              26
+## 1686             R Programming                  Looking at Data              17
+## 1687             R Programming                  Looking at Data              20
+## 1688 Getting and Cleaning Data     Manipulating Data with dplyr              45
+## 1689             R Programming               Subsetting Vectors              15
+## 1690             R Programming                  Looking at Data              27
+## 1691 Getting and Cleaning Data     Manipulating Data with dplyr              44
+## 1692 Getting and Cleaning Data     Manipulating Data with dplyr              46
+## 1693 Getting and Cleaning Data     Manipulating Data with dplyr              39
+## 1694             R Programming                  Dates and Times              27
+## 1695             R Programming                   Missing Values              23
+## 1696             R Programming               Subsetting Vectors               3
+## 1697             R Programming                  Dates and Times              28
+## 1698 Getting and Cleaning Data     Manipulating Data with dplyr              40
+## 1699 Getting and Cleaning Data     Manipulating Data with dplyr              41
+## 1700 Getting and Cleaning Data          Tidying Data with tidyr              24
+## 1701             R Programming               Subsetting Vectors              17
+## 1702 Getting and Cleaning Data     Manipulating Data with dplyr              47
+## 1703             R Programming               Subsetting Vectors              17
+## 1704             R Programming                  Dates and Times              28
+## 1705             R Programming               Subsetting Vectors               5
+## 1706 Getting and Cleaning Data     Manipulating Data with dplyr              55
+## 1707 Getting and Cleaning Data     Manipulating Data with dplyr              56
+## 1708 Getting and Cleaning Data          Tidying Data with tidyr              24
+## 1709 Getting and Cleaning Data     Manipulating Data with dplyr              53
+## 1710 Getting and Cleaning Data          Tidying Data with tidyr              20
+## 1711 Getting and Cleaning Data          Tidying Data with tidyr              20
+## 1712 Getting and Cleaning Data     Manipulating Data with dplyr              48
+## 1713 Getting and Cleaning Data     Manipulating Data with dplyr              49
+## 1714             R Programming               Subsetting Vectors              17
+## 1715 Getting and Cleaning Data          Tidying Data with tidyr              21
+## 1716 Getting and Cleaning Data     Manipulating Data with dplyr              55
+## 1717             R Programming               Subsetting Vectors              21
+## 1718 Getting and Cleaning Data     Manipulating Data with dplyr              50
+## 1719             R Programming            Basic Building Blocks              40
+## 1720             R Programming         Matrices and Data Frames              33
+## 1721             R Programming            Basic Building Blocks              12
+## 1722             R Programming         Matrices and Data Frames              10
+## 1723             R Programming         Matrices and Data Frames               5
+## 1724             R Programming            Basic Building Blocks              31
+## 1725             R Programming         Matrices and Data Frames               9
+## 1726             R Programming         Matrices and Data Frames              14
+## 1727             R Programming         Matrices and Data Frames               7
+## 1728             R Programming         Matrices and Data Frames              33
+## 1729             R Programming            Basic Building Blocks              39
+## 1730             R Programming            Basic Building Blocks              36
+## 1731             R Programming         Matrices and Data Frames              26
+## 1732             R Programming         Matrices and Data Frames               4
+## 1733             R Programming         Matrices and Data Frames              30
+## 1734             R Programming         Matrices and Data Frames              33
+## 1735             R Programming            Basic Building Blocks              33
+## 1736             R Programming            Basic Building Blocks              11
+## 1737             R Programming         Matrices and Data Frames               3
+## 1738             R Programming            Basic Building Blocks               3
+## 1739             R Programming            Basic Building Blocks              25
+## 1740             R Programming            Basic Building Blocks              41
+## 1741             R Programming            Basic Building Blocks              16
+## 1742             R Programming            Basic Building Blocks              38
+## 1743             R Programming         Matrices and Data Frames              21
+## 1744             R Programming         Matrices and Data Frames              13
+## 1745             R Programming         Matrices and Data Frames              22
+## 1746             R Programming            Basic Building Blocks              27
+## 1747             R Programming            Basic Building Blocks              10
+## 1748             R Programming         Matrices and Data Frames              16
+## 1749             R Programming         Matrices and Data Frames               6
+## 1750             R Programming         Matrices and Data Frames              17
+## 1751             R Programming         Matrices and Data Frames              17
+## 1752             R Programming         Matrices and Data Frames              10
+## 1753             R Programming            Basic Building Blocks              14
+## 1754             R Programming            Basic Building Blocks              15
+## 1755             R Programming         Matrices and Data Frames              35
+## 1756             R Programming         Matrices and Data Frames              22
+## 1757             R Programming         Matrices and Data Frames              21
+## 1758             R Programming         Matrices and Data Frames              37
+## 1759             R Programming         Matrices and Data Frames              27
+## 1760             R Programming            Basic Building Blocks              26
+## 1761             R Programming            Basic Building Blocks               8
+## 1762             R Programming            Basic Building Blocks              22
+## 1763             R Programming         Matrices and Data Frames               3
+## 1764             R Programming         Matrices and Data Frames              34
+## 1765             R Programming         Matrices and Data Frames              18
+## 1766             R Programming         Matrices and Data Frames              12
+## 1767             R Programming         Matrices and Data Frames              33
+## 1768             R Programming            Basic Building Blocks              17
+## 1769             R Programming            Basic Building Blocks              18
+## 1770             R Programming            Basic Building Blocks              21
+## 1771             R Programming         Matrices and Data Frames              38
+## 1772             R Programming         Matrices and Data Frames              39
+## 1773             R Programming            Basic Building Blocks              23
+## 1774             R Programming         Matrices and Data Frames              17
+## 1775             R Programming         Matrices and Data Frames              17
+## 1776             R Programming         Matrices and Data Frames              17
+## 1777             R Programming         Matrices and Data Frames              17
+## 1778             R Programming                          Vectors              29
+## 1779             R Programming            Basic Building Blocks              39
+## 1780             R Programming                          Vectors              30
+## 1781             R Programming            Basic Building Blocks              14
+## 1782             R Programming            Basic Building Blocks              14
+## 1783             R Programming            Basic Building Blocks              12
+## 1784             R Programming            Basic Building Blocks              33
+## 1785             R Programming            Basic Building Blocks              36
+## 1786             R Programming                          Vectors              25
+## 1787             R Programming              Workspace and Files              25
+## 1788             R Programming            Basic Building Blocks               3
+## 1789             R Programming                          Vectors              28
+## 1790             R Programming            Basic Building Blocks              40
+## 1791             R Programming            Basic Building Blocks               8
+## 1792             R Programming              Workspace and Files              34
+## 1793             R Programming              Workspace and Files              40
+## 1794             R Programming                          Vectors              25
+## 1795             R Programming            Basic Building Blocks              11
+## 1796             R Programming              Workspace and Files              42
+## 1797             R Programming              Workspace and Files              23
+## 1798             R Programming              Workspace and Files              27
+## 1799             R Programming            Basic Building Blocks              38
+## 1800             R Programming              Workspace and Files               8
+## 1801             R Programming            Basic Building Blocks              41
+## 1802             R Programming            Basic Building Blocks              10
+## 1803             R Programming            Basic Building Blocks              31
+## 1804             R Programming            Basic Building Blocks              27
+## 1805             R Programming                          Vectors              23
+## 1806             R Programming              Workspace and Files              34
+## 1807             R Programming              Workspace and Files              41
+## 1808             R Programming            Basic Building Blocks              17
+## 1809             R Programming              Workspace and Files              21
+## 1810             R Programming                          Vectors              32
+## 1811             R Programming                          Vectors              32
+## 1812             R Programming              Workspace and Files               5
+## 1813             R Programming              Workspace and Files               6
+## 1814             R Programming              Workspace and Files              31
+## 1815             R Programming              Workspace and Files              32
+## 1816             R Programming              Workspace and Files              33
+## 1817             R Programming              Workspace and Files              11
+## 1818             R Programming                          Vectors              39
+## 1819             R Programming              Workspace and Files              14
+## 1820             R Programming              Workspace and Files              35
+## 1821             R Programming            Basic Building Blocks              16
+## 1822             R Programming            Basic Building Blocks              15
+## 1823             R Programming              Workspace and Files              22
+## 1824             R Programming              Workspace and Files              22
+## 1825             R Programming                          Vectors               5
+## 1826             R Programming              Workspace and Files              29
+## 1827             R Programming                          Vectors              33
+## 1828             R Programming              Workspace and Files               9
+## 1829             R Programming              Workspace and Files              10
+## 1830             R Programming              Workspace and Files              32
+## 1831             R Programming                   Missing Values              20
+## 1832             R Programming                          Vectors              22
+## 1833             R Programming                          Vectors               7
+## 1834             R Programming                          Vectors              11
+## 1835             R Programming              Workspace and Files              17
+## 1836             R Programming                          Vectors              18
+## 1837             R Programming              Workspace and Files              19
+## 1838             R Programming            Basic Building Blocks              18
+## 1839             R Programming            Basic Building Blocks              21
+## 1840             R Programming                   Missing Values              19
+## 1841             R Programming                          Vectors               6
+## 1842             R Programming                          Vectors               7
+## 1843             R Programming                          Vectors              35
+## 1844             R Programming            Basic Building Blocks              26
+## 1845             R Programming                   Missing Values               8
+## 1846             R Programming                          Vectors              40
+## 1847             R Programming                          Vectors               8
+## 1848             R Programming                   Missing Values              23
+## 1849             R Programming                          Vectors              32
+## 1850             R Programming                          Vectors              17
+## 1851             R Programming                   Missing Values              10
+## 1852             R Programming                          Vectors              32
+## 1853             R Programming              Workspace and Files              15
+## 1854             R Programming                   Missing Values              18
+## 1855             R Programming                   Missing Values              20
+## 1856             R Programming                          Vectors               6
+## 1857             R Programming                   Missing Values              12
+## 1858             R Programming                   Missing Values               3
+## 1859             R Programming                   Missing Values               4
+## 1860             R Programming              Workspace and Files              15
+## 1861             R Programming            Basic Building Blocks              25
+## 1862             R Programming                   Missing Values              17
+## 1863             R Programming            Basic Building Blocks              22
+## 1864             R Programming                   Missing Values               9
+## 1865             R Programming                   Missing Values              21
+## 1866             R Programming                   Missing Values              22
+## 1867             R Programming                          Vectors              41
+## 1868             R Programming            Basic Building Blocks              23
+## 1869             R Programming                          Vectors              19
+## 1870             R Programming                          Vectors              18
+## 1871             R Programming                          Vectors              18
+## 1872             R Programming                   Missing Values               6
+## 1873             R Programming                          Vectors              22
+## 1874             R Programming                   Missing Values               7
+## 1875                                                                         NA
+## 1876             R Programming               Subsetting Vectors              21
+## 1877             R Programming         Matrices and Data Frames               3
+## 1878             R Programming                        Functions               5
+## 1879             R Programming                        Functions              34
+## 1880             R Programming                        Functions               8
+## 1881             R Programming                        Functions               3
+## 1882             R Programming               Subsetting Vectors              17
+## 1883             R Programming               Subsetting Vectors              22
+## 1884             R Programming            Basic Building Blocks              NA
+## 1885             R Programming                        Functions               8
+## 1886             R Programming            Basic Building Blocks              18
+## 1887             R Programming         Matrices and Data Frames              13
+## 1888                                                                         NA
+## 1889             R Programming            Basic Building Blocks              23
+## 1890             R Programming         Matrices and Data Frames              17
+## 1891             R Programming            Basic Building Blocks              17
+## 1892             R Programming              Workspace and Files              11
+## 1893             R Programming         Matrices and Data Frames              16
+## 1894             R Programming         Matrices and Data Frames               6
+## 1895             R Programming         Matrices and Data Frames               3
+## 1896             R Programming         Matrices and Data Frames               4
+## 1897             R Programming         Matrices and Data Frames               5
+## 1898             R Programming            Basic Building Blocks              21
+## 1899             R Programming              Workspace and Files              22
+## 1900             R Programming         Matrices and Data Frames              13
+## 1901             R Programming            Basic Building Blocks              22
+## 1902             R Programming                  Dates and Times               4
+## 1903             R Programming         Matrices and Data Frames              14
+## 1904             R Programming               Subsetting Vectors              23
+## 1905             R Programming               Subsetting Vectors              15
+## 1906             R Programming                        Functions               9
+## 1907             R Programming                            Logic               4
+## 1908             R Programming         Matrices and Data Frames               7
+## 1909             R Programming               Subsetting Vectors              26
+## 1910                         R                                               NA
+## 1911             R Programming            Basic Building Blocks              17
+## 1912             R Programming         Matrices and Data Frames              12
+## 1913             R Programming              Workspace and Files              10
+## 1914             R Programming                  Dates and Times               3
+## 1915             R Programming                            Logic              32
+## 1916             R Programming                            Logic              14
+## 1917             R Programming                  Dates and Times               8
+## 1918             R Programming                  Dates and Times               8
+## 1919             R Programming            Basic Building Blocks              12
+## 1920             R Programming               Subsetting Vectors              27
+## 1921             R Programming                            Logic               6
+## 1922             R Programming                            Logic               7
+## 1923             R Programming         Matrices and Data Frames              21
+## 1924             R Programming              Workspace and Files              23
+## 1925             R Programming         Matrices and Data Frames              18
+## 1926             R Programming               Subsetting Vectors              14
+## 1927             R Programming                            Logic              30
+## 1928             R Programming                        Functions              32
+## 1929             R Programming                  Dates and Times              17
+## 1930             R Programming                  Dates and Times               5
+## 1931             R Programming              Workspace and Files              15
+## 1932             R Programming                          Vectors              19
+## 1933             R Programming            Basic Building Blocks              10
+## 1934                       R P                                               NA
+## 1935             R Programming                        Functions              11
+## 1936             R Programming                        Functions              13
+## 1937             R Programming         Matrices and Data Frames              17
+## 1938             R Programming         Matrices and Data Frames              10
+## 1939             R Programming                            Logic              12
+## 1940             R Programming              Workspace and Files              22
+## 1941             R Programming                            Logic              13
+## 1942             R Programming                          Vectors               8
+## 1943             R Programming              Workspace and Files              14
+## 1944             R Programming                  Dates and Times               7
+## 1945             R Programming            Basic Building Blocks               3
+## 1946             R Programming                  Dates and Times               9
+## 1947             R Programming                          Vectors              25
+## 1948             R Programming         Matrices and Data Frames              18
+## 1949             R Programming                          Vectors               5
+## 1950             R Programming         Matrices and Data Frames               9
+## 1951             R Programming            Basic Building Blocks              15
+## 1952             R Programming            Basic Building Blocks              16
+## 1953             R Programming                            Logic              10
+## 1954             R Programming                  Dates and Times              16
+## 1955             R Programming                   Missing Values              19
+## 1956             R Programming                          Vectors              11
+## 1957             R Programming                          Vectors              17
+## 1958             R Programming                          Vectors              18
+## 1959             R Programming            Basic Building Blocks               8
+## 1960             R Programming         Matrices and Data Frames               7
+## 1961             R Programming            Basic Building Blocks              11
+## 1962                                                                         NA
+## 1963             R Programming                          Vectors               6
+## 1964             R Programming                          Vectors               6
+## 1965             R Programming                            Logic               9
+## 1966             R Programming              Workspace and Files               9
+## 1967             R Programming                        Functions              28
+## 1968             R Programming                          Vectors               7
+## 1969             R Programming                   Missing Values              20
+## 1970             R Programming                  Dates and Times              18
+## 1971             R Programming                  Dates and Times              19
+## 1972             R Programming                        Functions              19
+## 1973             R Programming                          Vectors              22
+## 1974             R Programming                          Vectors              23
+## 1975             R Programming         Matrices and Data Frames              10
+## 1976             R Programming            Basic Building Blocks              14
+## 1977             R Programming            Basic Building Blocks              14
+## 1978             R Programming         Matrices and Data Frames              14
+## 1979             R Programming         Matrices and Data Frames              16
+## 1980             R Programming                        Functions              14
+## 1981             R Programming              Workspace and Files               8
+## 1982             R Programming                        Functions              16
+## 1983             R Programming                        Functions              16
+## 1984             R Programming                        Functions              16
+## 1985             R Programming              Workspace and Files              15
+## 1986             R Programming         Matrices and Data Frames               6
+## 1987             R Programming               Subsetting Vectors               5
+## 1988             R Programming                          Vectors              25
+## 1989             R Programming                          Vectors              25
+## 1990             R Programming                          Vectors              28
+## 1991             R Programming                          Vectors              28
+## 1992             R Programming                          Vectors              29
+## 1993             R Programming                          Vectors              30
+## 1994             R Programming              Workspace and Files              21
+## 1995             R Programming                            Logic              27
+## 1996             R Programming                            Logic              28
+## 1997             R Programming                  Dates and Times              16
+## 1998             R Programming                        Functions              17
+## 1999             R Programming         Matrices and Data Frames               3
+## 2000             R Programming         Matrices and Data Frames               4
+## 2001             R Programming         Matrices and Data Frames               9
+## 2002             R Programming               Subsetting Vectors               8
+## 2003             R Programming         Matrices and Data Frames              12
+## 2004             R Programming         Matrices and Data Frames              13
+## 2005             R Programming               Subsetting Vectors              11
+## 2006             R Programming               Subsetting Vectors              13
+## 2007             R Programming                            Logic              21
+## 2008             R Programming                            Logic              23
+## 2009             R Programming                          Vectors               7
+## 2010             R Programming                  Dates and Times              15
+## 2011                                                                         NA
+## 2012             R Programming         Matrices and Data Frames               3
+## 2013             R Programming                   Missing Values              22
+## 2014             R Programming                        Functions              21
+## 2015             R Programming                            Logic              15
+## 2016             R Programming                            Logic              17
+## 2017             R Programming                  Dates and Times              11
+## 2018             R Programming              Workspace and Files               5
+## 2019             R Programming              Workspace and Files               6
+## 2020             R Programming               Subsetting Vectors              10
+## 2021             R Programming                        Functions              27
+## 2022             R Programming                  Dates and Times              14
+## 2023             R Programming                        Functions               8
+## 2024             R Programming                        Functions              11
+## 2025             R Programming                   Missing Values              17
+## 2026             R Programming                   Missing Values              21
+## 2027             R Programming         Matrices and Data Frames               5
+## 2028             R Programming                        Functions              17
+## 2029             R Programming                            Logic              15
+## 2030             R Programming              Workspace and Files              17
+## 2031             R Programming              Workspace and Files              17
+## 2032             R Programming              Workspace and Files              19
+## 2033             R Programming                        Functions              28
+## 2034             R Programming                  Dates and Times              12
+## 2035             R Programming                  Dates and Times              13
+## 2036             R Programming                        Functions               3
+## 2037             R Programming                        Functions               9
+## 2038             R Programming                   Missing Values              12
+## 2039             R Programming                   Missing Values              10
+## 2040             R Programming                   Missing Values              23
+## 2041             R Programming               Subsetting Vectors               3
+## 2042             R Programming                        Functions              16
+## 2043             R Programming                        Functions              25
+## 2044             R Programming                            Logic              18
+## 2045             R Programming                            Logic              20
+## 2046             R Programming                        Functions              21
+## 2047             R Programming                        Functions              23
+## 2048             R Programming                        Functions              25
+## 2049             R Programming                   Missing Values               8
+## 2050             R Programming                        Functions               5
+## 2051             R Programming                        Functions              16
+## 2052             R Programming                        Functions              23
+## 2053             R Programming                        Functions              13
+## 2054             R Programming                        Functions              14
+## 2055             R Programming                   Missing Values               6
+## 2056             R Programming                   Missing Values               7
+## 2057             R Programming               Subsetting Vectors               8
+## 2058             R Programming               Subsetting Vectors               9
+## 2059             R Programming                   Missing Values               8
+## 2060             R Programming                   Missing Values              18
+## 2061             R Programming                   Missing Values               9
+## 2062             R Programming                   Missing Values              17
+## 2063             R Programming                        Functions              27
+## 2064             R Programming                        Functions              19
+## 2065             R Programming                   Missing Values               4
+## 2066             R Programming                   Missing Values               3
+## 2067             R Programming                   Missing Values               3
+## 2068             R Programming                          Vectors              41
+## 2069             R Programming                  Dates and Times              29
+## 2070             R Programming                        Functions              40
+## 2071             R Programming                  Dates and Times              28
+## 2072             R Programming                        Functions              40
+## 2073             R Programming                        Functions              40
+## 2074             R Programming                  Dates and Times              28
+## 2075             R Programming                        Functions              11
+## 2076             R Programming                        Functions              42
+## 2077             R Programming                        Functions              40
+## 2078             R Programming                  Dates and Times              27
+## 2079             R Programming                  Dates and Times              37
+## 2080             R Programming                        Functions               9
+## 2081             R Programming                        Functions              40
+## 2082             R Programming                          Vectors              40
+## 2083             R Programming                  Dates and Times              24
+## 2084             R Programming                  Dates and Times              30
+## 2085             R Programming                        Functions              16
+## 2086             R Programming                            Logic              36
+## 2087             R Programming                  Dates and Times              32
+## 2088             R Programming                  Dates and Times              33
+## 2089             R Programming                  Dates and Times              35
+## 2090             R Programming                        Functions              41
+## 2091             R Programming                          Vectors              39
+## 2092             R Programming                          Vectors              35
+## 2093             R Programming                        Functions              28
+## 2094             R Programming                        Functions              38
+## 2095             R Programming                        Functions               8
+## 2096             R Programming                        Functions              40
+## 2097             R Programming                        Functions              14
+## 2098             R Programming              Workspace and Files              17
+## 2099             R Programming              Workspace and Files              19
+## 2100             R Programming                        Functions              16
+## 2101             R Programming                            Logic              39
+## 2102             R Programming                        Functions              16
+## 2103             R Programming                          Vectors               7
+## 2104             R Programming                        Functions              42
+## 2105             R Programming                  Dates and Times              38
+## 2106             R Programming                  Dates and Times              23
+## 2107             R Programming                        Functions              42
+## 2108             R Programming                        Functions              43
+## 2109             R Programming                        Functions              13
+## 2110             R Programming                        Functions              34
+## 2111             R Programming                        Functions              34
+## 2112             R Programming                        Functions              34
+## 2113             R Programming                          Vectors              29
+## 2114             R Programming                        Functions              51
+## 2115             R Programming                          Vectors               5
+## 2116             R Programming                        Functions              16
+## 2117             R Programming                        Functions              16
+## 2118             R Programming                        Functions              23
+## 2119             R Programming                  Dates and Times              39
+## 2120             R Programming                        Functions              27
+## 2121             R Programming                        Functions              28
+## 2122             R Programming              Workspace and Files              10
+## 2123             R Programming              Workspace and Files              11
+## 2124             R Programming              Workspace and Files              14
+## 2125             R Programming                        Functions              16
+## 2126             R Programming                        Functions              16
+## 2127             R Programming                  Dates and Times              16
+## 2128             R Programming                          Vectors              30
+## 2129             R Programming                          Vectors               6
+## 2130             R Programming                        Functions              19
+## 2131             R Programming                          Vectors              33
+## 2132             R Programming                          Vectors              33
+## 2133             R Programming                        Functions              36
+## 2134             R Programming                        Functions               5
+## 2135             R Programming              Workspace and Files               9
+## 2136             R Programming                        Functions              34
+## 2137             R Programming                  Dates and Times              14
+## 2138             R Programming                  Dates and Times              15
+## 2139             R Programming                          Vectors              28
+## 2140             R Programming              Workspace and Files              17
+## 2141             R Programming                            Logic              38
+## 2142             R Programming                        Functions              40
+## 2143             R Programming                        Functions              40
+## 2144             R Programming                        Functions              40
+## 2145             R Programming                        Functions              16
+## 2146             R Programming                        Functions              16
+## 2147             R Programming                        Functions              16
+## 2148             R Programming                        Functions              16
+## 2149             R Programming                            Logic              35
+## 2150             R Programming               Subsetting Vectors              23
+## 2151             R Programming               Subsetting Vectors              26
+## 2152             R Programming              Workspace and Files              15
+## 2153             R Programming                        Functions              50
+## 2154             R Programming                        Functions              16
+## 2155             R Programming                            Logic              51
+## 2156             R Programming                        Functions              17
+## 2157             R Programming                        Functions              52
+## 2158             R Programming                        Functions              21
+## 2159             R Programming                        Functions              25
+## 2160             R Programming                  Dates and Times               5
+## 2161             R Programming                        Functions              28
+## 2162             R Programming                        Functions              28
+## 2163             R Programming                        Functions              32
+## 2164             R Programming                          Vectors              19
+## 2165             R Programming                          Vectors              22
+## 2166             R Programming                  Dates and Times              15
+## 2167             R Programming                          Vectors              25
+## 2168             R Programming                  Dates and Times              17
+## 2169             R Programming                          Vectors              30
+## 2170             R Programming                          Vectors              32
+## 2171             R Programming                  Dates and Times              20
+## 2172             R Programming                  Dates and Times              22
+## 2173             R Programming                        Functions               3
+## 2174             R Programming              Workspace and Files               8
+## 2175             R Programming                            Logic              33
+## 2176             R Programming               Subsetting Vectors              23
+## 2177             R Programming            Basic Building Blocks              23
+## 2178             R Programming            Basic Building Blocks              25
+## 2179             R Programming                            Logic              36
+## 2180             R Programming                            Logic              37
+## 2181             R Programming            Basic Building Blocks              31
+## 2182             R Programming            Basic Building Blocks              33
+## 2183             R Programming                            Logic              41
+## 2184             R Programming                            Logic              41
+## 2185             R Programming                   Missing Values               7
+## 2186             R Programming                        Functions              42
+## 2187             R Programming              Workspace and Files              25
+## 2188             R Programming              Workspace and Files              27
+## 2189             R Programming                        Functions              16
+## 2190             R Programming                        Functions              16
+## 2191             R Programming                        Functions              16
+## 2192             R Programming                        Functions              48
+## 2193             R Programming                        Functions              16
+## 2194             R Programming              Workspace and Files              33
+## 2195             R Programming              Workspace and Files              34
+## 2196             R Programming              Workspace and Files              34
+## 2197             R Programming                   Missing Values              22
+## 2198             R Programming                            Logic              53
+## 2199             R Programming                  Dates and Times               4
+## 2200             R Programming            Basic Building Blocks               3
+## 2201             R Programming                          Vectors               8
+## 2202             R Programming                          Vectors              17
+## 2203             R Programming                          Vectors              18
+## 2204             R Programming                  Dates and Times              11
+## 2205             R Programming                  Dates and Times              12
+## 2206             R Programming                          Vectors              23
+## 2207             R Programming            Basic Building Blocks              15
+## 2208             R Programming                        Functions              34
+## 2209             R Programming                  Dates and Times              18
+## 2210             R Programming                  Dates and Times              19
+## 2211             R Programming                        Functions              34
+## 2212             R Programming                        Functions              35
+## 2213             R Programming            Basic Building Blocks              18
+## 2214             R Programming                            Logic              32
+## 2215             R Programming                            Logic              28
+## 2216             R Programming                            Logic              30
+## 2217             R Programming               Subsetting Vectors              21
+## 2218             R Programming               Subsetting Vectors              22
+## 2219             R Programming            Basic Building Blocks              26
+## 2220             R Programming            Basic Building Blocks              27
+## 2221             R Programming                            Logic              49
+## 2222             R Programming               Subsetting Vectors              27
+## 2223             R Programming            Basic Building Blocks              36
+## 2224             R Programming              Workspace and Files              19
+## 2225             R Programming                            Logic              41
+## 2226             R Programming                            Logic              41
+## 2227             R Programming                            Logic              41
+## 2228             R Programming                            Logic              42
+## 2229             R Programming              Workspace and Files              29
+## 2230             R Programming                        Functions              47
+## 2231             R Programming                        Functions              47
+## 2232             R Programming                        Functions              47
+## 2233             R Programming              Workspace and Files              32
+## 2234             R Programming               Subsetting Vectors               9
+## 2235             R Programming                            Logic              49
+## 2236             R Programming                            Logic              50
+## 2237             R Programming                            Logic               7
+## 2238             R Programming                   Missing Values              23
+## 2239             R Programming                            Logic              54
+## 2240             R Programming                            Logic              55
+## 2241             R Programming            Basic Building Blocks               8
+## 2242             R Programming                          Vectors              11
+## 2243             R Programming                  Dates and Times               9
+## 2244             R Programming            Basic Building Blocks              11
+## 2245             R Programming            Basic Building Blocks              12
+## 2246             R Programming                  Dates and Times              13
+## 2247             R Programming                            Logic              47
+## 2248             R Programming            Basic Building Blocks              14
+## 2249             R Programming              Workspace and Files               5
+## 2250             R Programming              Workspace and Files               6
+## 2251             R Programming            Basic Building Blocks              16
+## 2252             R Programming            Basic Building Blocks              17
+## 2253             R Programming                            Logic              20
+## 2254             R Programming            Basic Building Blocks              21
+## 2255             R Programming            Basic Building Blocks              22
+## 2256             R Programming            Basic Building Blocks              23
+## 2257             R Programming                            Logic              44
+## 2258             R Programming                            Logic              46
+## 2259             R Programming               Subsetting Vectors              22
+## 2260             R Programming               Subsetting Vectors               8
+## 2261             R Programming                   Missing Values              19
+## 2262             R Programming                   Missing Values              20
+## 2263             R Programming               Subsetting Vectors              29
+## 2264             R Programming            Basic Building Blocks              38
+## 2265             R Programming              Workspace and Files              21
+## 2266             R Programming              Workspace and Files              21
+## 2267             R Programming              Workspace and Files              22
+## 2268             R Programming              Workspace and Files              22
+## 2269             R Programming                            Logic              43
+## 2270             R Programming                  Dates and Times               8
+## 2271             R Programming               Subsetting Vectors               8
+## 2272             R Programming                            Logic              47
+## 2273             R Programming              Workspace and Files              31
+## 2274             R Programming                            Logic              15
+## 2275             R Programming                            Logic              17
+## 2276             R Programming                   Missing Values              21
+## 2277             R Programming                            Logic               4
+## 2278             R Programming                            Logic               9
+## 2279             R Programming              Workspace and Files              35
+## 2280             R Programming              Workspace and Files              40
+## 2281             R Programming                  Dates and Times               3
+## 2282             R Programming                  Dates and Times               7
+## 2283             R Programming                            Logic              27
+## 2284             R Programming                   Missing Values              10
+## 2285             R Programming               Subsetting Vectors               8
+## 2286             R Programming                            Logic              15
+## 2287             R Programming              Workspace and Files              32
+## 2288             R Programming                   Missing Values              17
+## 2289             R Programming                          Vectors              28
+## 2290             R Programming               Subsetting Vectors              13
+## 2291             R Programming                            Logic              18
+## 2292             R Programming               Subsetting Vectors              13
+## 2293             R Programming               Subsetting Vectors              14
+## 2294             R Programming                            Logic              21
+## 2295             R Programming                            Logic              23
+## 2296             R Programming              Workspace and Files              23
+## 2297             R Programming            Basic Building Blocks              10
+## 2298             R Programming              Workspace and Files              29
+## 2299             R Programming               Subsetting Vectors              34
+## 2300             R Programming                            Logic              15
+## 2301             R Programming                   Missing Values              12
+## 2302             R Programming                   Missing Values              18
+## 2303             R Programming               Subsetting Vectors              42
+## 2304             R Programming               Subsetting Vectors              30
+## 2305             R Programming               Subsetting Vectors              31
+## 2306             R Programming                   Missing Values               4
+## 2307             R Programming                   Missing Values               6
+## 2308             R Programming            Basic Building Blocks              41
+## 2309             R Programming              Workspace and Files              42
+## 2310             R Programming               Subsetting Vectors              21
+## 2311             R Programming                            Logic              14
+## 2312             R Programming                            Logic              12
+## 2313             R Programming               Subsetting Vectors              36
+## 2314             R Programming                            Logic               6
+## 2315             R Programming               Subsetting Vectors              40
+## 2316             R Programming            Basic Building Blocks              14
+## 2317             R Programming               Subsetting Vectors              11
+## 2318             R Programming               Subsetting Vectors              17
+## 2319             R Programming                            Logic              18
+## 2320             R Programming               Subsetting Vectors               3
+## 2321             R Programming              Workspace and Files              41
+## 2322             R Programming                            Logic              13
+## 2323             R Programming                   Missing Values               8
+## 2324             R Programming                   Missing Values               9
+## 2325             R Programming               Subsetting Vectors              33
+## 2326             R Programming               Subsetting Vectors              10
+## 2327             R Programming                            Logic              17
+## 2328             R Programming               Subsetting Vectors              37
+## 2329             R Programming               Subsetting Vectors              41
+## 2330             R Programming               Subsetting Vectors              15
+## 2331             R Programming               Subsetting Vectors              32
+## 2332             R Programming               Subsetting Vectors               8
+## 2333             R Programming                            Logic              18
+## 2334             R Programming               Subsetting Vectors              38
+## 2335             R Programming            Basic Building Blocks              40
+## 2336             R Programming               Subsetting Vectors               5
+## 2337             R Programming               Subsetting Vectors               8
+## 2338             R Programming            Basic Building Blocks              39
+## 2339             R Programming                            Logic              10
+## 2340             R Programming               Subsetting Vectors              32
+## 2341             R Programming         Matrices and Data Frames               3
+## 2342             R Programming         Matrices and Data Frames               3
+## 2343             R Programming         Matrices and Data Frames               4
+## 2344             R Programming         Matrices and Data Frames              34
+## 2345             R Programming         Matrices and Data Frames               3
+## 2346             R Programming         Matrices and Data Frames              34
+## 2347             R Programming         Matrices and Data Frames              39
+## 2348             R Programming         Matrices and Data Frames              35
+## 2349             R Programming         Matrices and Data Frames               3
+## 2350             R Programming         Matrices and Data Frames              38
+## 2351             R Programming         Matrices and Data Frames              27
+## 2352             R Programming         Matrices and Data Frames               9
+## 2353             R Programming         Matrices and Data Frames              37
+## 2354             R Programming         Matrices and Data Frames              33
+## 2355             R Programming         Matrices and Data Frames              13
+## 2356             R Programming         Matrices and Data Frames              14
+## 2357             R Programming         Matrices and Data Frames              10
+## 2358             R Programming         Matrices and Data Frames              12
+## 2359             R Programming         Matrices and Data Frames               6
+## 2360             R Programming         Matrices and Data Frames               7
+## 2361             R Programming         Matrices and Data Frames              16
+## 2362             R Programming         Matrices and Data Frames               5
+## 2363             R Programming         Matrices and Data Frames              30
+## 2364             R Programming         Matrices and Data Frames              26
+## 2365             R Programming         Matrices and Data Frames              21
+## 2366             R Programming         Matrices and Data Frames              22
+## 2367             R Programming         Matrices and Data Frames              17
+## 2368             R Programming         Matrices and Data Frames              18
+## 2369             R Programming         Matrices and Data Frames              26
+## 2370                                                                         NA
+## 2371             R Programming            Basic Building Blocks              10
+## 2372             R Programming            Basic Building Blocks              25
+## 2373             R Programming            Basic Building Blocks               8
+## 2374             R Programming            Basic Building Blocks              23
+## 2375             R Programming            Basic Building Blocks               3
+## 2376             R Programming            Basic Building Blocks              14
+## 2377             R Programming            Basic Building Blocks              15
+## 2378             R Programming            Basic Building Blocks              23
+## 2379             R Programming            Basic Building Blocks              22
+## 2380             R Programming            Basic Building Blocks              18
+## 2381             R Programming            Basic Building Blocks              11
+## 2382             R Programming            Basic Building Blocks              21
+## 2383             R Programming            Basic Building Blocks              17
+## 2384             R Programming            Basic Building Blocks              12
+## 2385             R Programming            Basic Building Blocks              16
+## 2386             R Programming            Basic Building Blocks              25
+## 2387             R Programming            Basic Building Blocks              22
+## 2388             R Programming                   Missing Values              12
+## 2389             R Programming                          Vectors              30
+## 2390             R Programming                          Vectors              29
+## 2391             R Programming                  Dates and Times              39
+## 2392             R Programming            Basic Building Blocks              14
+## 2393             R Programming                            Logic              36
+## 2394             R Programming            Basic Building Blocks              12
+## 2395             R Programming            Basic Building Blocks              21
+## 2396             R Programming            Basic Building Blocks              21
+## 2397             R Programming                            Logic              21
+## 2398             R Programming                            Logic              15
+## 2399             R Programming                          Vectors              25
+## 2400             R Programming                            Logic              18
+## 2401             R Programming            Basic Building Blocks              23
+## 2402             R Programming            Basic Building Blocks              11
+## 2403             R Programming                  Dates and Times               8
+## 2404             R Programming                          Vectors              30
+## 2405             R Programming            Basic Building Blocks              15
+## 2406             R Programming                            Logic              14
+## 2407             R Programming            Basic Building Blocks              18
+## 2408             R Programming                            Logic              12
+## 2409             R Programming                            Logic              13
+## 2410             R Programming                            Logic              15
+## 2411             R Programming                            Logic              17
+## 2412             R Programming         Matrices and Data Frames              34
+## 2413             R Programming                  Dates and Times              38
+## 2414             R Programming                            Logic              20
+## 2415             R Programming                  Dates and Times               7
+## 2416             R Programming                   Missing Values               9
+## 2417             R Programming                   Missing Values              10
+## 2418             R Programming                  Dates and Times              23
+## 2419             R Programming                          Vectors              17
+## 2420             R Programming            Basic Building Blocks              16
+## 2421             R Programming            Basic Building Blocks              17
+## 2422             R Programming                          Vectors              18
+## 2423             R Programming                  Dates and Times               3
+## 2424             R Programming                          Vectors              23
+## 2425             R Programming                  Dates and Times              33
+## 2426             R Programming                  Dates and Times               4
+## 2427             R Programming                          Vectors              28
+## 2428             R Programming                          Vectors               6
+## 2429             R Programming                          Vectors               7
+## 2430             R Programming                          Vectors               7
+## 2431             R Programming                          Vectors               8
+## 2432             R Programming                          Vectors              11
+## 2433             R Programming                            Logic              54
+## 2434             R Programming                            Logic              55
+## 2435             R Programming                            Logic              39
+## 2436             R Programming                          Vectors              19
+## 2437             R Programming                          Vectors              22
+## 2438             R Programming               Subsetting Vectors              13
+## 2439             R Programming                  Dates and Times              35
+## 2440             R Programming                  Dates and Times              37
+## 2441             R Programming                  Dates and Times               5
+## 2442             R Programming               Subsetting Vectors              21
+## 2443             R Programming               Subsetting Vectors              22
+## 2444             R Programming                  Dates and Times               9
+## 2445             R Programming                            Logic              23
+## 2446             R Programming                            Logic              27
+## 2447             R Programming                          Vectors              35
+## 2448             R Programming                          Vectors              18
+## 2449             R Programming                            Logic              10
+## 2450             R Programming               Subsetting Vectors              11
+## 2451             R Programming                   Missing Values               3
+## 2452             R Programming               Subsetting Vectors              14
+## 2453             R Programming         Matrices and Data Frames              34
+## 2454             R Programming                            Logic              33
+## 2455             R Programming                   Missing Values               8
+## 2456             R Programming                  Dates and Times              22
+## 2457             R Programming                            Logic              35
+## 2458             R Programming            Basic Building Blocks              41
+## 2459             R Programming                            Logic              36
+## 2460             R Programming                            Logic              37
+## 2461             R Programming                            Logic              38
+## 2462             R Programming                            Logic              38
+## 2463             R Programming                          Vectors              41
+## 2464             R Programming                  Dates and Times              32
+## 2465             R Programming                            Logic              42
+## 2466             R Programming                            Logic              43
+## 2467             R Programming                            Logic              44
+## 2468             R Programming                          Vectors               5
+## 2469             R Programming                            Logic              49
+## 2470             R Programming                            Logic              50
+## 2471             R Programming                            Logic              51
+## 2472             R Programming                            Logic              53
+## 2473             R Programming                            Logic               4
+## 2474             R Programming                            Logic               6
+## 2475             R Programming                            Logic               7
+## 2476             R Programming                            Logic               9
+## 2477             R Programming         Matrices and Data Frames              22
+## 2478             R Programming         Matrices and Data Frames              26
+## 2479             R Programming         Matrices and Data Frames              27
+## 2480             R Programming               Subsetting Vectors              15
+## 2481             R Programming               Subsetting Vectors              17
+## 2482             R Programming                   Missing Values               7
+## 2483             R Programming            Basic Building Blocks              39
+## 2484             R Programming               Subsetting Vectors              23
+## 2485             R Programming               Subsetting Vectors              26
+## 2486             R Programming                          Vectors              32
+## 2487             R Programming                            Logic              28
+## 2488             R Programming                            Logic              30
+## 2489             R Programming                            Logic              32
+## 2490             R Programming                            Logic              32
+## 2491             R Programming                            Logic              32
+## 2492             R Programming                            Logic              32
+## 2493             R Programming                            Logic              32
+## 2494             R Programming                   Missing Values               6
+## 2495             R Programming                            Logic              46
+## 2496             R Programming                            Logic              47
+## 2497             R Programming            Basic Building Blocks              40
+## 2498             R Programming               Subsetting Vectors              42
+## 2499             R Programming         Matrices and Data Frames               3
+## 2500             R Programming                   Missing Values              17
+## 2501             R Programming                   Missing Values              17
+## 2502             R Programming                   Missing Values              17
+## 2503             R Programming                  Dates and Times              27
+## 2504             R Programming                            Logic              41
+## 2505             R Programming                   Missing Values              20
+## 2506             R Programming                   Missing Values              21
+## 2507             R Programming                   Missing Values              22
+## 2508             R Programming         Matrices and Data Frames              33
+## 2509             R Programming                  Dates and Times              19
+## 2510             R Programming            Basic Building Blocks               3
+## 2511             R Programming            Basic Building Blocks               8
+## 2512             R Programming            Basic Building Blocks              10
+## 2513             R Programming               Subsetting Vectors               8
+## 2514             R Programming               Subsetting Vectors               8
+## 2515             R Programming               Subsetting Vectors               9
+## 2516             R Programming               Subsetting Vectors              10
+## 2517             R Programming                          Vectors              40
+## 2518             R Programming            Basic Building Blocks              33
+## 2519             R Programming            Basic Building Blocks              36
+## 2520             R Programming         Matrices and Data Frames              30
+## 2521             R Programming                  Dates and Times              18
+## 2522             R Programming                  Dates and Times              30
+## 2523             R Programming                  Dates and Times              20
+## 2524             R Programming         Matrices and Data Frames              35
+## 2525             R Programming         Matrices and Data Frames              37
+## 2526             R Programming                  Dates and Times              11
+## 2527             R Programming                          Vectors              33
+## 2528             R Programming            Basic Building Blocks              27
+## 2529             R Programming                          Vectors              39
+## 2530             R Programming                   Missing Values              18
+## 2531             R Programming                   Missing Values              19
+## 2532             R Programming                  Dates and Times              28
+## 2533             R Programming                   Missing Values               4
+## 2534             R Programming                  Dates and Times              29
+## 2535             R Programming               Subsetting Vectors              36
+## 2536             R Programming         Matrices and Data Frames              13
+## 2537             R Programming            Basic Building Blocks              38
+## 2538             R Programming               Subsetting Vectors              41
+## 2539             R Programming         Matrices and Data Frames              17
+## 2540             R Programming                  Dates and Times              23
+## 2541             R Programming                  Dates and Times              24
+## 2542             R Programming                  Dates and Times              27
+## 2543             R Programming         Matrices and Data Frames              21
+## 2544             R Programming                  Dates and Times              15
+## 2545             R Programming                  Dates and Times              16
+## 2546             R Programming                  Dates and Times              28
+## 2547             R Programming                  Dates and Times              17
+## 2548             R Programming         Matrices and Data Frames              10
+## 2549             R Programming               Subsetting Vectors              37
+## 2550             R Programming               Subsetting Vectors               5
+## 2551             R Programming               Subsetting Vectors               3
+## 2552             R Programming         Matrices and Data Frames              14
+## 2553             R Programming               Subsetting Vectors              27
+## 2554             R Programming         Matrices and Data Frames              18
+## 2555             R Programming         Matrices and Data Frames              21
+## 2556             R Programming                  Dates and Times              14
+## 2557             R Programming                  Dates and Times              27
+## 2558             R Programming         Matrices and Data Frames               6
+## 2559             R Programming                  Dates and Times              16
+## 2560             R Programming         Matrices and Data Frames               9
+## 2561             R Programming               Subsetting Vectors              34
+## 2562             R Programming         Matrices and Data Frames              12
+## 2563             R Programming            Basic Building Blocks              36
+## 2564             R Programming               Subsetting Vectors              40
+## 2565             R Programming         Matrices and Data Frames               4
+## 2566             R Programming         Matrices and Data Frames              16
+## 2567             R Programming                  Dates and Times              12
+## 2568             R Programming                  Dates and Times              13
+## 2569             R Programming               Subsetting Vectors              33
+## 2570             R Programming            Basic Building Blocks              26
+## 2571             R Programming               Subsetting Vectors              31
+## 2572             R Programming         Matrices and Data Frames               7
+## 2573             R Programming                   Missing Values              23
+## 2574             R Programming            Basic Building Blocks              25
+## 2575             R Programming               Subsetting Vectors              36
+## 2576             R Programming         Matrices and Data Frames              38
+## 2577             R Programming         Matrices and Data Frames               3
+## 2578             R Programming               Subsetting Vectors              32
+## 2579             R Programming               Subsetting Vectors              29
+## 2580             R Programming         Matrices and Data Frames               5
+## 2581             R Programming            Basic Building Blocks              31
+## 2582             R Programming               Subsetting Vectors              38
+## 2583             R Programming               Subsetting Vectors              30
+## 2584             R Programming         Matrices and Data Frames              39
+## 2585                                                                         NA
+## 2586 Exploratory_Data_Analysis            Graphics_Devices_in_R              15
+## 2587 Exploratory_Data_Analysis            Graphics_Devices_in_R               7
+## 2588 Exploratory_Data_Analysis            Graphics_Devices_in_R              27
+## 2589 Exploratory_Data_Analysis            Graphics_Devices_in_R              30
+## 2590 Exploratory_Data_Analysis            Graphics_Devices_in_R              25
+## 2591 Exploratory_Data_Analysis            Graphics_Devices_in_R              26
+## 2592 Exploratory_Data_Analysis            Graphics_Devices_in_R              10
+## 2593 Exploratory_Data_Analysis            Graphics_Devices_in_R              10
+## 2594 Getting and Cleaning Data Grouping and Chaining with dplyr              16
+## 2595 Getting and Cleaning Data          Grouping and Chaining w              NA
+## 2596 Exploratory_Data_Analysis            Graphics_Devices_in_R              14
+## 2597 Exploratory_Data_Analysis            Graphics_Devices_in_R              13
+## 2598 Exploratory_Data_Analysis             Base_Plotting_System              12
+## 2599 Exploratory_Data_Analysis             Base_Plotting_System              12
+## 2600 Exploratory_Data_Analysis             Base_Plotting_System              13
+## 2601 Exploratory_Data_Analysis               Clustering_Example               5
+## 2602 Exploratory_Data_Analysis               Clustering_Example               8
+## 2603 Exploratory_Data_Analysis            Graphics_Devices_in_R              31
+## 2604 Exploratory_Data_Analysis               K_Means_Clustering              16
+## 2605 Getting and Cleaning Data          Tidying Data with tidyr              19
+## 2606 Getting and Cleaning Data          Tidying Data with tidyr              20
+## 2607 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 2608 Exploratory_Data_Analysis            Graphics_Devices_in_R              11
+## 2609 Exploratory_Data_Analysis            Graphics_Devices_in_R              12
+## 2610 Exploratory_Data_Analysis             Base_Plotting_System              12
+## 2611 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 2612 Getting and Cleaning Data     Manipulating Data with dplyr               6
+## 2613 Getting and Cleaning Data     Manipulating Data with dplyr               7
+## 2614 Getting and Cleaning Data     Manipulating Data with dplyr               8
+## 2615 Getting and Cleaning Data     Manipulating Data with dplyr              10
+## 2616 Getting and Cleaning Data     Manipulating Data with dplyr              11
+## 2617 Getting and Cleaning Data     Manipulating Data with dplyr              12
+## 2618 Exploratory_Data_Analysis               K_Means_Clustering              17
+## 2619 Exploratory_Data_Analysis               K_Means_Clustering              18
+## 2620                        Ex                                               NA
+## 2621 Exploratory_Data_Analysis             Base_Plotting_System               6
+## 2622 Exploratory_Data_Analysis             Base_Plotting_System              11
+## 2623 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 2624             R Programming                  Looking at Data              20
+## 2625             R Programming                  Looking at Data              22
+## 2626             R Programming                  Looking at Data              26
+## 2627             R Programming                  Looking at Data              27
+## 2628 Exploratory_Data_Analysis             Base_Plotting_System              14
+## 2629 Exploratory_Data_Analysis             Base_Plotting_System              15
+## 2630 Exploratory_Data_Analysis             Base_Plotting_System              15
+## 2631             R Programming                  Looking at Data              10
+## 2632             R Programming                  Looking at Data              11
+## 2633             R Programming                  Looking at Data              13
+## 2634 Exploratory_Data_Analysis    Principles_of_Analytic_Graphs               3
+## 2635 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 2636             R Programming                  Looking at Data              17
+## 2637 Exploratory_Data_Analysis               Clustering_Example              13
+## 2638 Exploratory_Data_Analysis               Clustering_Example              14
+## 2639 Exploratory_Data_Analysis               Clustering_Example              16
+## 2640 Exploratory_Data_Analysis               Clustering_Example              17
+## 2641 Exploratory_Data_Analysis               Clustering_Example              18
+## 2642 Exploratory_Data_Analysis               Clustering_Example              19
+## 2643                         E                                               NA
+## 2644 Getting and Cleaning Data Grouping and Chaining with dplyr              14
+## 2645 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 2646 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 2647 Getting and Cleaning Data          Tidying Data with tidyr              12
+## 2648             R Programming                  Looking at Data              16
+## 2649 Exploratory_Data_Analysis    Principles_of_Analytic_Graphs               7
+## 2650 Exploratory_Data_Analysis    Principles_of_Analytic_Graphs              11
+## 2651 Exploratory_Data_Analysis    Principles_of_Analytic_Graphs              14
+## 2652 Getting and Cleaning Data     Manipulating Data with dplyr               5
+## 2653 Getting and Cleaning Data     Manipulating Data with dplyr               6
+## 2654             R Programming                  Looking at Data               4
+## 2655             R Programming                  Looking at Data               6
+## 2656             R Programming                  Looking at Data               8
+## 2657             R Programming                  Looking at Data               9
+## 2658 Exploratory_Data_Analysis    Principles_of_Analytic_Graphs              34
+## 2659 Exploratory_Data_Analysis    Principles_of_Analytic_Graphs              35
+## 2660 Exploratory_Data_Analysis    Principles_of_Analytic_Graphs              35
+## 2661             R Programming                  Looking at Data              15
+## 2662 Exploratory_Data_Analysis             Base_Plotting_System               6
+## 2663 Exploratory_Data_Analysis               Clustering_Example              12
+## 2664 Exploratory_Data_Analysis               Exploratory_Graphs              17
+## 2665 Exploratory_Data_Analysis               Exploratory_Graphs              19
+## 2666 Exploratory_Data_Analysis               Exploratory_Graphs              22
+## 2667 Exploratory_Data_Analysis               Exploratory_Graphs              23
+## 2668             R Programming                          Looking              NA
+## 2669 Exploratory_Data_Analysis               Exploratory_Graphs               3
+## 2670 Exploratory_Data_Analysis               Exploratory_Graphs               5
+## 2671 Exploratory_Data_Analysis             Base_Plotting_System              16
+## 2672 Exploratory_Data_Analysis               Clustering_Example               9
+## 2673 Exploratory_Data_Analysis               Clustering_Example               9
+## 2674 Getting and Cleaning Data          Tidying Data with tidyr              12
+## 2675 Exploratory_Data_Analysis               Clustering_Example              11
+## 2676 Getting and Cleaning Data          Tidying Data with tidyr              20
+## 2677 Getting and Cleaning Data                    Tidying Data               NA
+## 2678 Exploratory_Data_Analysis               Exploratory_Graphs              17
+## 2679 Exploratory_Data_Analysis               K_Means_Clustering               8
+## 2680             R Programming                  Looking at Data               3
+## 2681                                                                         NA
+## 2682 Exploratory_Data_Analysis               K_Means_Clustering              13
+## 2683 Exploratory_Data_Analysis               K_Means_Clustering              15
+## 2684 Exploratory_Data_Analysis                      Hierarchica              NA
+## 2685 Getting and Cleaning Data          Tidying Data with tidyr              15
+## 2686 Getting and Cleaning Data Grouping and Chaining with dplyr              14
+## 2687 Exploratory_Data_Analysis             Base_Plotting_System              18
+## 2688 Exploratory_Data_Analysis               Clustering_Example              10
+## 2689 Exploratory_Data_Analysis               Exploratory_Graphs              15
+## 2690 Exploratory_Data_Analysis               Exploratory_Graphs              16
+## 2691 Exploratory_Data_Analysis          Hierarchical_Clustering              20
+## 2692 Exploratory_Data_Analysis          Hierarchical_Clustering              20
+## 2693 Exploratory_Data_Analysis               K_Means_Clustering               8
+## 2694 Exploratory_Data_Analysis    Principles_of_Analytic_Graphs              25
+## 2695 Exploratory_Data_Analysis    Principles_of_Analytic_Graphs              32
+## 2696 Exploratory_Data_Analysis    Principles_of_Analytic_Graphs              33
+## 2697 Exploratory_Data_Analysis    Principles_of_Analytic_Graphs              34
+## 2698 Exploratory_Data_Analysis               Exploratory_Graphs               8
+## 2699 Exploratory_Data_Analysis             Base_Plotting_System              16
+## 2700 Getting and Cleaning Data Grouping and Chaining with dplyr              11
+## 2701 Exploratory_Data_Analysis          Hierarchical_Clustering              18
+## 2702 Exploratory_Data_Analysis          Hierarchical_Clustering              20
+## 2703 Exploratory_Data_Analysis          Hierarchical_Clustering              20
+## 2704 Exploratory_Data_Analysis               Exploratory_Graphs              14
+## 2705 Exploratory_Data_Analysis               K_Means_Clustering               8
+## 2706 Exploratory_Data_Analysis          Hierarchical_Clustering              20
+## 2707 Exploratory_Data_Analysis               K_Means_Clustering               9
+## 2708 Exploratory_Data_Analysis               K_Means_Clustering               9
+## 2709 Exploratory_Data_Analysis               K_Means_Clustering              12
+## 2710 Exploratory_Data_Analysis          Hierarchical_Clustering              28
+## 2711 Getting and Cleaning Data Grouping and Chaining with dplyr              10
+## 2712 Getting and Cleaning Data Grouping and Chaining with dplyr              10
+## 2713 Exploratory_Data_Analysis          Hierarchical_Clustering               8
+## 2714 Getting and Cleaning Data          Tidying Data with tidyr              11
+## 2715 Exploratory_Data_Analysis               Exploratory_Graphs              10
+## 2716 Exploratory_Data_Analysis               Exploratory_Graphs              12
+## 2717 Exploratory_Data_Analysis          Hierarchical_Clustering              24
+## 2718 Exploratory_Data_Analysis          Hierarchical_Clustering              26
+## 2719 Exploratory_Data_Analysis               K_Means_Clustering               8
+## 2720 Exploratory_Data_Analysis    Principles_of_Analytic_Graphs              21
+## 2721 Getting and Cleaning Data          Tidying Data with tidyr               6
+## 2722 Getting and Cleaning Data          Tidying Data with tidyr               8
+## 2723 Exploratory_Data_Analysis          Hierarchical_Clustering              27
+## 2724 Getting and Cleaning Data Grouping and Chaining with dplyr               9
+## 2725 Exploratory_Data_Analysis          Hierarchical_Clustering              22
+## 2726 Getting and Cleaning Data Grouping and Chaining with dplyr               5
+## 2727 Getting and Cleaning Data Grouping and Chaining with dplyr               6
+## 2728 Getting and Cleaning Data Grouping and Chaining with dplyr               7
+## 2729 Getting and Cleaning Data Grouping and Chaining with dplyr               8
+## 2730 Getting and Cleaning Data          Tidying Data with tidyr               3
+## 2731 Exploratory_Data_Analysis               K_Means_Clustering               8
+## 2732 Getting and Cleaning Data     Manipulating Data with dplyr               6
+## 2733 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 2734 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 2735 Getting and Cleaning Data     Manipulating Data with dplyr               5
+## 2736 Getting and Cleaning Data     Manipulating Data with dplyr              21
+## 2737 Getting and Cleaning Data                      Manipulatin              NA
+## 2738             R Programming                  Dates and Times              14
+## 2739             R Programming                  Dates and Times              15
+## 2740             R Programming                  Dates and Times               3
+## 2741             R Programming                  Dates and Times               3
+## 2742 Getting and Cleaning Data     Manipulating Data with dplyr               7
+## 2743 Getting and Cleaning Data     Manipulating Data with dplyr               8
+## 2744 Getting and Cleaning Data     Manipulating Data with dplyr              10
+## 2745 Getting and Cleaning Data     Manipulating Data with dplyr              11
+## 2746 Getting and Cleaning Data     Manipulating Data with dplyr              12
+## 2747 Getting and Cleaning Data     Manipulating Data with dplyr              16
+## 2748 Getting and Cleaning Data     Manipulating Data with dplyr              18
+## 2749             R Programming                  Dates and Times              12
+## 2750             R Programming                  Dates and Times              13
+## 2751             R Programming                  Dates and Times               4
+## 2752             R Programming                  Dates and Times               5
+## 2753             R Programming                  Dates and Times              16
+## 2754             R Programming                  Dates and Times              16
+## 2755             R Programming                  Dates and Times               8
+## 2756             R Programming                  Dates and Times               9
+## 2757             R Programming                  Dates and Times               7
+## 2758             R Programming                  Dates and Times               7
+## 2759             R Programming                  Dates and Times              11
+## 2760                        R                                                NA
+## 2761             R Programming                  Dates and Times              17
+## 2762             R Programming            Basic Building Blocks              21
+## 2763             R Programming            Basic Building Blocks              10
+## 2764             R Programming            Basic Building Blocks              21
+## 2765             R Programming            Basic Building Blocks              36
+## 2766             R Programming            Basic Building Blocks              14
+## 2767             R Programming            Basic Building Blocks              18
+## 2768             R Programming            Basic Building Blocks              22
+## 2769             R Programming            Basic Building Blocks               8
+## 2770             R Programming            Basic Building Blocks              17
+## 2771             R Programming            Basic Building Blocks              12
+## 2772             R Programming            Basic Building Blocks              31
+## 2773             R Programming            Basic Building Blocks              38
+## 2774             R Programming            Basic Building Blocks              33
+## 2775             R Programming            Basic Building Blocks              17
+## 2776             R Programming            Basic Building Blocks              11
+## 2777             R Programming            Basic Building Blocks               3
+## 2778             R Programming            Basic Building Blocks              41
+## 2779             R Programming            Basic Building Blocks              23
+## 2780             R Programming            Basic Building Blocks              16
+## 2781             R Programming            Basic Building Blocks              27
+## 2782             R Programming            Basic Building Blocks              40
+## 2783             R Programming            Basic Building Blocks              15
+## 2784             R Programming            Basic Building Blocks              26
+## 2785             R Programming            Basic Building Blocks              15
+## 2786             R Programming            Basic Building Blocks              25
+## 2787             R Programming            Basic Building Blocks              39
+## 2788             R Programming            Basic Building Blocks              25
+## 2789             R Programming            Basic Building Blocks              36
+## 2790             R Programming            Basic Building Blocks              21
+## 2791             R Programming            Basic Building Blocks               3
+## 2792             R Programming            Basic Building Blocks              22
+## 2793             R Programming            Basic Building Blocks              17
+## 2794             R Programming            Basic Building Blocks              33
+## 2795             R Programming            Basic Building Blocks              41
+## 2796             R Programming            Basic Building Blocks              23
+## 2797             R Programming            Basic Building Blocks              31
+## 2798             R Programming            Basic Building Blocks              12
+## 2799             R Programming            Basic Building Blocks              14
+## 2800             R Programming            Basic Building Blocks              40
+## 2801             R Programming            Basic Building Blocks              16
+## 2802             R Programming            Basic Building Blocks              38
+## 2803             R Programming            Basic Building Blocks              18
+## 2804             R Programming            Basic Building Blocks              39
+## 2805             R Programming            Basic Building Blocks              27
+## 2806             R Programming            Basic Building Blocks               8
+## 2807             R Programming            Basic Building Blocks              10
+## 2808             R Programming            Basic Building Blocks              15
+## 2809             R Programming            Basic Building Blocks              26
+## 2810             R Programming            Basic Building Blocks              11
+## 2811             R Programming         Matrices and Data Frames              16
+## 2812             R Programming         Matrices and Data Frames              17
+## 2813             R Programming         Matrices and Data Frames              18
+## 2814             R Programming         Matrices and Data Frames              38
+## 2815             R Programming         Matrices and Data Frames              21
+## 2816             R Programming         Matrices and Data Frames              18
+## 2817             R Programming         Matrices and Data Frames              18
+## 2818             R Programming         Matrices and Data Frames              33
+## 2819             R Programming         Matrices and Data Frames              34
+## 2820             R Programming         Matrices and Data Frames              34
+## 2821             R Programming         Matrices and Data Frames              35
+## 2822             R Programming         Matrices and Data Frames              37
+## 2823             R Programming         Matrices and Data Frames               3
+## 2824             R Programming         Matrices and Data Frames              39
+## 2825             R Programming         Matrices and Data Frames              21
+## 2826             R Programming         Matrices and Data Frames              21
+## 2827             R Programming         Matrices and Data Frames              22
+## 2828             R Programming         Matrices and Data Frames              26
+## 2829             R Programming         Matrices and Data Frames              27
+## 2830             R Programming         Matrices and Data Frames              30
+## 2831             R Programming         Matrices and Data Frames              13
+## 2832             R Programming         Matrices and Data Frames              14
+## 2833             R Programming         Matrices and Data Frames              16
+## 2834             R Programming         Matrices and Data Frames               4
+## 2835             R Programming         Matrices and Data Frames               5
+## 2836             R Programming         Matrices and Data Frames               6
+## 2837             R Programming         Matrices and Data Frames               7
+## 2838             R Programming         Matrices and Data Frames               9
+## 2839             R Programming         Matrices and Data Frames              10
+## 2840             R Programming         Matrices and Data Frames              12
+## 2841             R Programming            Basic Building Blocks               3
+## 2842             R Programming            Basic Building Blocks               8
+## 2843             R Programming            Basic Building Blocks              10
+## 2844             R Programming            Basic Building Blocks              11
+## 2845             R Programming            Basic Building Blocks              11
+## 2846             R Programming            Basic Building Blocks              12
+## 2847             R Programming            Basic Building Blocks              14
+## 2848             R Programming            Basic Building Blocks              14
+## 2849             R Programming            Basic Building Blocks              14
+## 2850             R Programming            Basic Building Blocks              14
+## 2851             R Programming            Basic Building Blocks              15
+## 2852             R Programming            Basic Building Blocks              15
+## 2853             R Programming            Basic Building Blocks              16
+## 2854             R Programming            Basic Building Blocks              17
+## 2855             R Programming            Basic Building Blocks              17
+## 2856             R Programming            Basic Building Blocks              18
+## 2857             R Programming            Basic Building Blocks              21
+## 2858             R Programming            Basic Building Blocks              21
+## 2859             R Programming            Basic Building Blocks              21
+## 2860             R Programming            Basic Building Blocks              22
+## 2861             R Programming            Basic Building Blocks              22
+## 2862             R Programming            Basic Building Blocks              23
+## 2863             R Programming            Basic Building Blocks              23
+## 2864             R Programming            Basic Building Blocks              25
+## 2865             R Programming            Basic Building Blocks              25
+## 2866             R Programming            Basic Building Blocks              26
+## 2867             R Programming            Basic Building Blocks              27
+## 2868             R Programming            Basic Building Blocks              31
+## 2869             R Programming            Basic Building Blocks              33
+## 2870             R Programming            Basic Building Blocks              36
+## 2871             R Programming            Basic Building Blocks              38
+## 2872             R Programming            Basic Building Blocks              39
+## 2873             R Programming            Basic Building Blocks              40
+## 2874             R Programming            Basic Building Blocks              41
+## 2875             R Programming              Workspace and Files               5
+## 2876             R Programming              Workspace and Files               6
+## 2877             R Programming              Workspace and Files               8
+## 2878             R Programming              Workspace and Files               9
+## 2879             R Programming              Workspace and Files              10
+## 2880             R Programming              Workspace and Files              11
+## 2881             R Programming              Workspace and Files              14
+## 2882             R Programming              Workspace and Files              15
+## 2883             R Programming              Workspace and Files              15
+## 2884             R Programming              Workspace and Files              17
+## 2885             R Programming              Workspace and Files              19
+## 2886             R Programming              Workspace and Files              21
+## 2887             R Programming              Workspace and Files              22
+## 2888             R Programming              Workspace and Files              22
+## 2889             R Programming              Workspace and Files              23
+## 2890             R Programming              Workspace and Files              23
+## 2891             R Programming              Workspace and Files              23
+## 2892             R Programming              Workspace and Files              25
+## 2893             R Programming              Workspace and Files              27
+## 2894             R Programming              Workspace and Files              27
+## 2895             R Programming              Workspace and Files              29
+## 2896             R Programming              Workspace and Files              31
+## 2897             R Programming              Workspace and Files              31
+## 2898             R Programming              Workspace and Files              32
+## 2899             R Programming              Workspace and Files              33
+## 2900             R Programming              Workspace and Files              34
+## 2901             R Programming              Workspace and Files              34
+## 2902             R Programming              Workspace and Files              35
+## 2903             R Programming              Workspace and Files              40
+## 2904             R Programming              Workspace and Files              41
+## 2905             R Programming              Workspace and Files              42
+## 2906             R Programming                          Vectors               5
+## 2907             R Programming                          Vectors               6
+## 2908             R Programming                          Vectors               6
+## 2909             R Programming                          Vectors               7
+## 2910             R Programming                          Vectors               8
+## 2911             R Programming                          Vectors              11
+## 2912             R Programming                          Vectors              17
+## 2913             R Programming                          Vectors              17
+## 2914             R Programming                          Vectors              17
+## 2915             R Programming                          Vectors              18
+## 2916             R Programming                          Vectors              18
+## 2917             R Programming                          Vectors              19
+## 2918             R Programming                          Vectors              22
+## 2919             R Programming                          Vectors              23
+## 2920             R Programming                          Vectors              25
+## 2921             R Programming                          Vectors              25
+## 2922             R Programming                          Vectors              28
+## 2923             R Programming                          Vectors              29
+## 2924             R Programming                          Vectors              30
+## 2925             R Programming                          Vectors              32
+## 2926             R Programming                          Vectors              32
+## 2927             R Programming                          Vectors              33
+## 2928             R Programming                          Vectors              33
+## 2929             R Programming                          Vectors              35
+## 2930             R Programming                          Vectors              39
+## 2931             R Programming                          Vectors              40
+## 2932             R Programming                          Vectors              41
+## 2933             R Programming         Matrices and Data Frames              30
+## 2934             R Programming         Matrices and Data Frames              33
+## 2935             R Programming         Matrices and Data Frames              34
+## 2936             R Programming         Matrices and Data Frames              34
+## 2937             R Programming         Matrices and Data Frames              35
+## 2938             R Programming         Matrices and Data Frames              37
+## 2939             R Programming         Matrices and Data Frames              38
+## 2940             R Programming         Matrices and Data Frames              39
+## 2941             R Programming                  Dates and Times               3
+## 2942             R Programming                  Dates and Times               4
+## 2943             R Programming                  Dates and Times               5
+## 2944             R Programming                  Dates and Times               5
+## 2945             R Programming                  Dates and Times               7
+## 2946             R Programming                  Dates and Times               8
+## 2947             R Programming                  Dates and Times               8
+## 2948             R Programming                  Dates and Times               9
+## 2949             R Programming                  Dates and Times              11
+## 2950             R Programming                  Dates and Times              12
+## 2951             R Programming                  Dates and Times              13
+## 2952             R Programming                  Dates and Times              14
+## 2953             R Programming                  Dates and Times              15
+## 2954             R Programming                  Dates and Times              16
+## 2955             R Programming                  Dates and Times              17
+## 2956             R Programming                   Missing Values               3
+## 2957             R Programming                   Missing Values               3
+## 2958             R Programming                   Missing Values               4
+## 2959             R Programming                   Missing Values               6
+## 2960             R Programming                   Missing Values               7
+## 2961             R Programming                   Missing Values               8
+## 2962             R Programming                   Missing Values               9
+## 2963             R Programming                   Missing Values              10
+## 2964             R Programming                   Missing Values              12
+## 2965             R Programming                   Missing Values              17
+## 2966             R Programming                   Missing Values              17
+## 2967             R Programming                   Missing Values              18
+## 2968             R Programming                   Missing Values              19
+## 2969             R Programming                   Missing Values              20
+## 2970             R Programming                   Missing Values              21
+## 2971             R Programming                   Missing Values              22
+## 2972             R Programming                   Missing Values              23
+## 2973             R Programming               Subsetting Vectors               3
+## 2974             R Programming               Subsetting Vectors               5
+## 2975             R Programming               Subsetting Vectors               8
+## 2976             R Programming               Subsetting Vectors               9
+## 2977             R Programming               Subsetting Vectors              10
+## 2978             R Programming               Subsetting Vectors              11
+## 2979             R Programming               Subsetting Vectors              13
+## 2980             R Programming               Subsetting Vectors              13
+## 2981             R Programming               Subsetting Vectors              14
+## 2982             R Programming               Subsetting Vectors              15
+## 2983             R Programming               Subsetting Vectors              17
+## 2984             R Programming               Subsetting Vectors              21
+## 2985             R Programming               Subsetting Vectors              21
+## 2986             R Programming               Subsetting Vectors              22
+## 2987             R Programming               Subsetting Vectors              23
+## 2988             R Programming               Subsetting Vectors              26
+## 2989             R Programming               Subsetting Vectors              27
+## 2990             R Programming               Subsetting Vectors              29
+## 2991             R Programming               Subsetting Vectors              30
+## 2992             R Programming               Subsetting Vectors              31
+## 2993             R Programming               Subsetting Vectors              32
+## 2994             R Programming               Subsetting Vectors              32
+## 2995             R Programming               Subsetting Vectors              33
+## 2996             R Programming               Subsetting Vectors              34
+## 2997             R Programming               Subsetting Vectors              36
+## 2998             R Programming               Subsetting Vectors              36
+## 2999             R Programming               Subsetting Vectors              37
+## 3000             R Programming               Subsetting Vectors              38
+## 3001             R Programming               Subsetting Vectors              40
+## 3002             R Programming               Subsetting Vectors              41
+## 3003             R Programming               Subsetting Vectors              42
+## 3004             R Programming                            Logic               4
+## 3005             R Programming                            Logic               6
+## 3006             R Programming                            Logic               7
+## 3007             R Programming                            Logic               9
+## 3008             R Programming                            Logic              10
+## 3009             R Programming                            Logic              12
+## 3010             R Programming                            Logic              13
+## 3011             R Programming                            Logic              14
+## 3012             R Programming                            Logic              15
+## 3013             R Programming                            Logic              15
+## 3014             R Programming                            Logic              15
+## 3015             R Programming                            Logic              15
+## 3016             R Programming                            Logic              17
+## 3017             R Programming                            Logic              17
+## 3018             R Programming                            Logic              17
+## 3019             R Programming                            Logic              18
+## 3020             R Programming                            Logic              18
+## 3021             R Programming                            Logic              20
+## 3022             R Programming                            Logic              21
+## 3023             R Programming                            Logic              23
+## 3024             R Programming                            Logic              27
+## 3025             R Programming                            Logic              28
+## 3026             R Programming                            Logic              30
+## 3027             R Programming                            Logic              32
+## 3028             R Programming                            Logic              32
+## 3029             R Programming                            Logic              33
+## 3030             R Programming                            Logic              33
+## 3031             R Programming                            Logic              35
+## 3032             R Programming                            Logic              36
+## 3033             R Programming                            Logic              36
+## 3034             R Programming                            Logic              36
+## 3035             R Programming                            Logic              37
+## 3036             R Programming                            Logic              38
+## 3037             R Programming                            Logic              39
+## 3038             R Programming                            Logic              41
+## 3039             R Programming                            Logic              41
+## 3040             R Programming                            Logic              41
+## 3041             R Programming                            Logic              41
+## 3042             R Programming                            Logic              42
+## 3043             R Programming                            Logic              43
+## 3044             R Programming                            Logic              44
+## 3045             R Programming                            Logic              46
+## 3046             R Programming                            Logic              47
+## 3047             R Programming                            Logic              49
+## 3048             R Programming                            Logic              49
+## 3049             R Programming                            Logic              50
+## 3050             R Programming                            Logic              50
+## 3051             R Programming                            Logic              50
+## 3052             R Programming                            Logic              50
+## 3053             R Programming                            Logic              50
+## 3054             R Programming                            Logic              50
+## 3055             R Programming                            Logic              50
+## 3056             R Programming                            Logic              50
+## 3057             R Programming                            Logic              50
+## 3058             R Programming                            Logic              51
+## 3059             R Programming                            Logic              53
+## 3060             R Programming                            Logic              54
+## 3061             R Programming                            Logic              55
+## 3062             R Programming         Matrices and Data Frames               3
+## 3063             R Programming         Matrices and Data Frames               4
+## 3064             R Programming                  Dates and Times              18
+## 3065             R Programming                  Dates and Times              19
+## 3066             R Programming                  Dates and Times              20
+## 3067             R Programming                  Dates and Times              22
+## 3068             R Programming                  Dates and Times              23
+## 3069             R Programming                  Dates and Times              23
+## 3070             R Programming                  Dates and Times              24
+## 3071             R Programming                  Dates and Times              27
+## 3072             R Programming         Matrices and Data Frames               3
+## 3073             R Programming         Matrices and Data Frames               3
+## 3074             R Programming         Matrices and Data Frames               3
+## 3075             R Programming                  Dates and Times              27
+## 3076             R Programming                  Dates and Times              28
+## 3077             R Programming                  Dates and Times              28
+## 3078             R Programming                  Dates and Times              29
+## 3079             R Programming                  Dates and Times              30
+## 3080             R Programming                  Dates and Times              32
+## 3081             R Programming                  Dates and Times              33
+## 3082             R Programming                  Dates and Times              35
+## 3083             R Programming                  Dates and Times              37
+## 3084             R Programming                  Dates and Times              38
+## 3085             R Programming                  Dates and Times              27
+## 3086             R Programming                  Dates and Times              27
+## 3087             R Programming                  Dates and Times              27
+## 3088             R Programming         Matrices and Data Frames              16
+## 3089             R Programming         Matrices and Data Frames              17
+## 3090             R Programming         Matrices and Data Frames              17
+## 3091             R Programming         Matrices and Data Frames               5
+## 3092             R Programming         Matrices and Data Frames               6
+## 3093             R Programming         Matrices and Data Frames               7
+## 3094             R Programming         Matrices and Data Frames               9
+## 3095             R Programming         Matrices and Data Frames              10
+## 3096             R Programming         Matrices and Data Frames              12
+## 3097             R Programming         Matrices and Data Frames              13
+## 3098             R Programming                  Dates and Times              39
+## 3099             R Programming         Matrices and Data Frames              14
+## 3100             R Programming         Matrices and Data Frames              16
+## 3101             R Programming         Matrices and Data Frames              21
+## 3102             R Programming         Matrices and Data Frames              22
+## 3103             R Programming         Matrices and Data Frames              26
+## 3104             R Programming         Matrices and Data Frames              18
+## 3105             R Programming         Matrices and Data Frames              30
+## 3106             R Programming         Matrices and Data Frames              14
+## 3107             R Programming         Matrices and Data Frames              27
+## 3108             R Programming            Basic Building Blocks              23
+## 3109             R Programming            Basic Building Blocks              18
+## 3110             R Programming            Basic Building Blocks              11
+## 3111             R Programming            Basic Building Blocks              16
+## 3112             R Programming            Basic Building Blocks              15
+## 3113             R Programming            Basic Building Blocks              39
+## 3114             R Programming            Basic Building Blocks              21
+## 3115             R Programming            Basic Building Blocks              17
+## 3116             R Programming            Basic Building Blocks              33
+## 3117             R Programming            Basic Building Blocks              14
+## 3118             R Programming            Basic Building Blocks              40
+## 3119             R Programming            Basic Building Blocks               3
+## 3120             R Programming            Basic Building Blocks              12
+## 3121             R Programming            Basic Building Blocks              25
+## 3122             R Programming            Basic Building Blocks              26
+## 3123             R Programming            Basic Building Blocks              12
+## 3124             R Programming            Basic Building Blocks              22
+## 3125             R Programming            Basic Building Blocks              38
+## 3126             R Programming            Basic Building Blocks              31
+## 3127             R Programming            Basic Building Blocks              36
+## 3128             R Programming            Basic Building Blocks              41
+## 3129             R Programming            Basic Building Blocks              10
+## 3130             R Programming            Basic Building Blocks               8
+## 3131             R Programming            Basic Building Blocks              27
+## 3132             R Programming              Workspace and Files               6
+## 3133             R Programming              Workspace and Files               5
+## 3134             R Programming              Workspace and Files              11
+## 3135             R Programming              Workspace and Files               8
+## 3136             R Programming              Workspace and Files               9
+## 3137             R Programming              Workspace and Files              10
+## 3138             R Programming              Workspace and Files              17
+## 3139             R Programming              Workspace and Files              17
+## 3140             R Programming              Workspace and Files              19
+## 3141             R Programming              Workspace and Files              21
+## 3142             R Programming              Workspace and Files              22
+## 3143             R Programming              Workspace and Files              22
+## 3144             R Programming              Workspace and Files              23
+## 3145             R Programming              Workspace and Files              25
+## 3146             R Programming              Workspace and Files              27
+## 3147             R Programming              Workspace and Files              29
+## 3148             R Programming              Workspace and Files              14
+## 3149             R Programming              Workspace and Files              15
+## 3150             R Programming              Workspace and Files              15
+## 3151             R Programming              Workspace and Files              32
+## 3152             R Programming              Workspace and Files              33
+## 3153             R Programming              Workspace and Files              34
+## 3154             R Programming              Workspace and Files              34
+## 3155             R Programming              Workspace and Files              34
+## 3156             R Programming              Workspace and Files              35
+## 3157             R Programming              Workspace and Files              40
+## 3158             R Programming              Workspace and Files              41
+## 3159             R Programming              Workspace and Files              42
+## 3160             R Programming                          Vectors               5
+## 3161             R Programming              Workspace and Files              31
+## 3162             R Programming              Workspace and Files              31
+## 3163             R Programming              Workspace and Files              32
+## 3164             R Programming                          Vectors               8
+## 3165             R Programming                          Vectors              11
+## 3166             R Programming                          Vectors              17
+## 3167             R Programming                          Vectors              18
+## 3168             R Programming                          Vectors              19
+## 3169             R Programming                          Vectors              22
+## 3170             R Programming                          Vectors              23
+## 3171             R Programming                          Vectors              25
+## 3172             R Programming                          Vectors              25
+## 3173             R Programming                          Vectors              28
+## 3174             R Programming                          Vectors              28
+## 3175             R Programming                          Vectors              29
+## 3176             R Programming                          Vectors              30
+## 3177             R Programming                          Vectors              30
+## 3178             R Programming                          Vectors              32
+## 3179             R Programming                          Vectors              33
+## 3180             R Programming                          Vectors              35
+## 3181             R Programming                          Vectors              39
+## 3182             R Programming                          Vectors              40
+## 3183             R Programming                          Vectors              41
+## 3184             R Programming                   Missing Values               3
+## 3185             R Programming                   Missing Values               4
+## 3186             R Programming                   Missing Values               6
+## 3187             R Programming                   Missing Values               7
+## 3188             R Programming                   Missing Values               8
+## 3189             R Programming                   Missing Values               9
+## 3190             R Programming                   Missing Values              10
+## 3191             R Programming                   Missing Values              12
+## 3192             R Programming                   Missing Values              17
+## 3193             R Programming                   Missing Values              18
+## 3194             R Programming                   Missing Values              19
+## 3195             R Programming                   Missing Values              20
+## 3196             R Programming                   Missing Values              20
+## 3197             R Programming                   Missing Values              20
+## 3198             R Programming                   Missing Values              21
+## 3199             R Programming                   Missing Values              22
+## 3200             R Programming                   Missing Values              23
+## 3201             R Programming                          Vectors               5
+## 3202             R Programming                          Vectors               6
+## 3203             R Programming                          Vectors               7
+## 3204                                                                         NA
+## 3205             R Programming            Basic Building Blocks              11
+## 3206             R Programming            Basic Building Blocks              12
+## 3207             R Programming            Basic Building Blocks              14
+## 3208             R Programming            Basic Building Blocks              16
+## 3209             R Programming            Basic Building Blocks              17
+## 3210             R Programming            Basic Building Blocks               3
+## 3211             R Programming            Basic Building Blocks              15
+## 3212             R Programming            Basic Building Blocks              10
+## 3213             R Programming                            Logic              41
+## 3214             R Programming                            Logic              41
+## 3215             R Programming                            Logic              42
+## 3216             R Programming                            Logic              43
+## 3217             R Programming                            Logic              44
+## 3218             R Programming                            Logic              46
+## 3219             R Programming                            Logic              47
+## 3220             R Programming                            Logic              49
+## 3221             R Programming                            Logic              50
+## 3222             R Programming                            Logic              51
+## 3223             R Programming                            Logic              53
+## 3224             R Programming            Basic Building Blocks               8
+## 3225             R Programming                            Logic              41
+## 3226             R Programming                  Dates and Times               3
+## 3227             R Programming                  Dates and Times               4
+## 3228             R Programming                  Dates and Times               5
+## 3229             R Programming                  Dates and Times               7
+## 3230             R Programming                  Dates and Times               8
+## 3231             R Programming                  Dates and Times               9
+## 3232             R Programming                  Dates and Times              11
+## 3233             R Programming                  Dates and Times              12
+## 3234             R Programming            Basic Building Blocks              18
+## 3235             R Programming            Basic Building Blocks              21
+## 3236             R Programming            Basic Building Blocks              21
+## 3237             R Programming                            Logic              54
+## 3238             R Programming                            Logic              55
+## 3239             R Programming                  Dates and Times              27
+## 3240             R Programming                  Dates and Times              27
+## 3241             R Programming                  Dates and Times              27
+## 3242             R Programming                  Dates and Times              27
+## 3243             R Programming                  Dates and Times              28
+## 3244             R Programming                  Dates and Times              29
+## 3245             R Programming                  Dates and Times              30
+## 3246             R Programming                  Dates and Times              32
+## 3247             R Programming                  Dates and Times              33
+## 3248             R Programming                  Dates and Times              35
+## 3249             R Programming                  Dates and Times              37
+## 3250             R Programming            Basic Building Blocks              22
+## 3251             R Programming            Basic Building Blocks              23
+## 3252             R Programming                        Functions               3
+## 3253             R Programming                        Functions               5
+## 3254             R Programming                        Functions               8
+## 3255             R Programming                        Functions               9
+## 3256             R Programming                        Functions              11
+## 3257             R Programming                        Functions              13
+## 3258             R Programming                        Functions              14
+## 3259             R Programming                        Functions              16
+## 3260             R Programming                        Functions              17
+## 3261             R Programming                        Functions              19
+## 3262             R Programming                        Functions              21
+## 3263             R Programming                  Dates and Times              38
+## 3264             R Programming                  Dates and Times              39
+## 3265             R Programming                        Functions              27
+## 3266             R Programming            Basic Building Blocks              25
+## 3267             R Programming            Basic Building Blocks              26
+## 3268             R Programming            Basic Building Blocks              27
+## 3269             R Programming            Basic Building Blocks              31
+## 3270             R Programming            Basic Building Blocks              33
+## 3271             R Programming            Basic Building Blocks              36
+## 3272             R Programming            Basic Building Blocks              38
+## 3273             R Programming            Basic Building Blocks              39
+## 3274             R Programming            Basic Building Blocks              40
+## 3275             R Programming            Basic Building Blocks              41
+## 3276             R Programming                        Functions              23
+## 3277             R Programming                        Functions              25
+## 3278             R Programming                  Dates and Times              27
+## 3279             R Programming               Subsetting Vectors              31
+## 3280             R Programming               Subsetting Vectors              32
+## 3281             R Programming               Subsetting Vectors              33
+## 3282             R Programming               Subsetting Vectors              34
+## 3283             R Programming               Subsetting Vectors              36
+## 3284             R Programming               Subsetting Vectors              36
+## 3285             R Programming               Subsetting Vectors              36
+## 3286             R Programming               Subsetting Vectors              37
+## 3287             R Programming               Subsetting Vectors              38
+## 3288             R Programming               Subsetting Vectors              40
+## 3289             R Programming               Subsetting Vectors              41
+## 3290             R Programming               Subsetting Vectors              42
+## 3291             R Programming                            Logic               4
+## 3292             R Programming                            Logic               6
+## 3293             R Programming                            Logic               7
+## 3294             R Programming                            Logic               9
+## 3295             R Programming                            Logic              10
+## 3296             R Programming                            Logic              12
+## 3297             R Programming                            Logic              13
+## 3298             R Programming                            Logic              14
+## 3299             R Programming                            Logic              15
+## 3300             R Programming                            Logic              15
+## 3301             R Programming                            Logic              17
+## 3302             R Programming                            Logic              18
+## 3303             R Programming                            Logic              20
+## 3304             R Programming                            Logic              21
+## 3305             R Programming                            Logic              23
+## 3306             R Programming                            Logic              27
+## 3307             R Programming                            Logic              27
+## 3308             R Programming                            Logic              28
+## 3309             R Programming                            Logic              30
+## 3310             R Programming                            Logic              32
+## 3311             R Programming                            Logic              33
+## 3312             R Programming                            Logic              35
+## 3313             R Programming                            Logic              36
+## 3314             R Programming                            Logic              37
+## 3315             R Programming                            Logic              38
+## 3316             R Programming                            Logic              38
+## 3317             R Programming                            Logic              38
+## 3318             R Programming                            Logic              39
+## 3319             R Programming                            Logic              41
+## 3320             R Programming                          Vectors               5
+## 3321             R Programming                          Vectors               6
+## 3322             R Programming                          Vectors               6
+## 3323             R Programming                          Vectors               7
+## 3324             R Programming                          Vectors               8
+## 3325             R Programming                          Vectors              11
+## 3326             R Programming                          Vectors              17
+## 3327             R Programming                          Vectors              18
+## 3328             R Programming                          Vectors              19
+## 3329             R Programming                          Vectors              22
+## 3330             R Programming                          Vectors              23
+## 3331             R Programming                          Vectors              25
+## 3332             R Programming                          Vectors              28
+## 3333             R Programming                          Vectors              29
+## 3334             R Programming                          Vectors              30
+## 3335             R Programming                          Vectors              32
+## 3336             R Programming                          Vectors              32
+## 3337             R Programming                          Vectors              33
+## 3338             R Programming                          Vectors              35
+## 3339             R Programming                          Vectors              39
+## 3340             R Programming                          Vectors              40
+## 3341             R Programming                          Vectors              41
+## 3342             R Programming                  Dates and Times              13
+## 3343             R Programming                  Dates and Times              14
+## 3344             R Programming                  Dates and Times              15
+## 3345             R Programming                  Dates and Times              16
+## 3346             R Programming                  Dates and Times              16
+## 3347             R Programming                  Dates and Times              17
+## 3348             R Programming                  Dates and Times              18
+## 3349             R Programming                  Dates and Times              19
+## 3350             R Programming                  Dates and Times              20
+## 3351             R Programming                  Dates and Times              22
+## 3352             R Programming                  Dates and Times              23
+## 3353             R Programming                  Dates and Times              24
+## 3354             R Programming                  Dates and Times              27
+## 3355             R Programming                  Dates and Times              27
+## 3356             R Programming                  Dates and Times              27
+## 3357             R Programming                  Dates and Times              27
+## 3358             R Programming                  Dates and Times              27
+## 3359             R Programming              Workspace and Files               6
+## 3360             R Programming              Workspace and Files               6
+## 3361             R Programming              Workspace and Files               8
+## 3362             R Programming              Workspace and Files               9
+## 3363             R Programming              Workspace and Files              10
+## 3364             R Programming              Workspace and Files              11
+## 3365             R Programming              Workspace and Files              14
+## 3366             R Programming              Workspace and Files              14
+## 3367             R Programming              Workspace and Files              15
+## 3368             R Programming              Workspace and Files              17
+## 3369             R Programming              Workspace and Files              19
+## 3370             R Programming              Workspace and Files              21
+## 3371             R Programming              Workspace and Files              22
+## 3372             R Programming              Workspace and Files              23
+## 3373             R Programming              Workspace and Files              25
+## 3374             R Programming              Workspace and Files              27
+## 3375             R Programming              Workspace and Files              27
+## 3376             R Programming              Workspace and Files              27
+## 3377             R Programming              Workspace and Files              29
+## 3378             R Programming              Workspace and Files              29
+## 3379             R Programming              Workspace and Files              31
+## 3380             R Programming              Workspace and Files              32
+## 3381             R Programming              Workspace and Files              33
+## 3382             R Programming              Workspace and Files              34
+## 3383             R Programming              Workspace and Files              35
+## 3384             R Programming              Workspace and Files              40
+## 3385             R Programming              Workspace and Files              41
+## 3386             R Programming              Workspace and Files              42
+## 3387             R Programming                        Functions              27
+## 3388             R Programming                        Functions              27
+## 3389             R Programming                        Functions              28
+## 3390             R Programming                        Functions              32
+## 3391             R Programming                        Functions              34
+## 3392             R Programming                        Functions              35
+## 3393             R Programming                        Functions              35
+## 3394             R Programming                        Functions              36
+## 3395             R Programming                        Functions              38
+## 3396             R Programming                        Functions              40
+## 3397             R Programming                        Functions              41
+## 3398             R Programming                        Functions              42
+## 3399             R Programming                        Functions              43
+## 3400             R Programming                        Functions              47
+## 3401             R Programming                        Functions              48
+## 3402             R Programming                        Functions              48
+## 3403             R Programming                        Functions              48
+## 3404             R Programming                        Functions              50
+## 3405             R Programming                        Functions              51
+## 3406             R Programming                        Functions              52
+## 3407             R Programming                   Missing Values               9
+## 3408             R Programming                   Missing Values               9
+## 3409             R Programming                   Missing Values              10
+## 3410             R Programming                   Missing Values              12
+## 3411             R Programming                   Missing Values              17
+## 3412             R Programming                   Missing Values              18
+## 3413             R Programming                   Missing Values              19
+## 3414             R Programming                   Missing Values              20
+## 3415             R Programming                   Missing Values              20
+## 3416             R Programming                   Missing Values              20
+## 3417             R Programming                   Missing Values              21
+## 3418             R Programming                   Missing Values              22
+## 3419             R Programming                   Missing Values              23
+## 3420             R Programming               Subsetting Vectors               3
+## 3421             R Programming               Subsetting Vectors               5
+## 3422             R Programming               Subsetting Vectors               8
+## 3423             R Programming               Subsetting Vectors               8
+## 3424             R Programming               Subsetting Vectors               8
+## 3425             R Programming               Subsetting Vectors               8
+## 3426             R Programming               Subsetting Vectors               9
+## 3427             R Programming               Subsetting Vectors              10
+## 3428             R Programming               Subsetting Vectors              10
+## 3429             R Programming               Subsetting Vectors              11
+## 3430             R Programming               Subsetting Vectors              13
+## 3431             R Programming               Subsetting Vectors              14
+## 3432             R Programming               Subsetting Vectors              15
+## 3433             R Programming               Subsetting Vectors              17
+## 3434             R Programming               Subsetting Vectors              21
+## 3435             R Programming               Subsetting Vectors              21
+## 3436             R Programming               Subsetting Vectors              22
+## 3437             R Programming               Subsetting Vectors              23
+## 3438             R Programming               Subsetting Vectors              26
+## 3439             R Programming              Workspace and Files               5
+## 3440             R Programming                   Missing Values               3
+## 3441             R Programming                   Missing Values               3
+## 3442             R Programming                   Missing Values               4
+## 3443             R Programming                   Missing Values               4
+## 3444             R Programming                   Missing Values               6
+## 3445             R Programming                   Missing Values               7
+## 3446             R Programming                   Missing Values               8
+## 3447             R Programming               Subsetting Vectors              30
+## 3448             R Programming               Subsetting Vectors              27
+## 3449             R Programming               Subsetting Vectors              29
+## 3450             R Programming                  Dates and Times              16
+## 3451 Getting and Cleaning Data          Tidying Data with tidyr              19
+## 3452             R Programming                  Dates and Times               5
+## 3453             R Programming                  Dates and Times               7
+## 3454             R Programming                  Dates and Times              14
+## 3455             R Programming                  Dates and Times              15
+## 3456             R Programming                  Dates and Times              16
+## 3457 Getting and Cleaning Data          Tidying Data with tidyr               8
+## 3458 Getting and Cleaning Data Grouping and Chaining with dplyr               6
+## 3459 Getting and Cleaning Data          Tidying Data with tidyr              11
+## 3460 Getting and Cleaning Data          Tidying Data with tidyr               6
+## 3461 Getting and Cleaning Data          Tidying Data with tidyr              15
+## 3462             R Programming                  Dates and Times               3
+## 3463 Getting and Cleaning Data            Tidying Data with tid              NA
+## 3464             R Programming            Basic Building Blocks              27
+## 3465             R Programming                  Dates and Times              13
+## 3466             R Programming                            Logic              15
+## 3467             R Programming                   Missing Values               3
+## 3468                     R Pro                                               NA
+## 3469             R Programming                   Missing Values              20
+## 3470 Getting and Cleaning Data                   Grouping and C              NA
+## 3471             R Programming            Basic Building Blocks              26
+## 3472 Getting and Cleaning Data Grouping and Chaining with dplyr               7
+## 3473             R Programming                  Dates and Times              20
+## 3474 Getting and Cleaning Data          Tidying Data with tidyr              20
+## 3475             R Programming               Subsetting Vectors              13
+## 3476             R Programming                  Dates and Times               4
+## 3477             R Programming              Workspace and Files              29
+## 3478             R Programming                  Dates and Times              17
+## 3479             R Programming                  Dates and Times               8
+## 3480 Getting and Cleaning Data          Tidying Data with tidyr               6
+## 3481 Getting and Cleaning Data Grouping and Chaining with dplyr               8
+## 3482             R Programming                  Dates and Times               9
+## 3483             R Programming                  Dates and Times              11
+## 3484             R Programming                          Vectors              23
+## 3485             R Programming               Subsetting Vectors               9
+## 3486 Getting and Cleaning Data          Tidying Data with tidyr              12
+## 3487 Getting and Cleaning Data Grouping and Chaining with dplyr              10
+## 3488             R Programming                            Logic              32
+## 3489 Getting and Cleaning Data Grouping and Chaining with dplyr              11
+## 3490 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 3491             R Programming                   Missing Values              19
+## 3492             R Programming         Matrices and Data Frames              16
+## 3493 Getting and Cleaning Data Grouping and Chaining with dplyr              17
+## 3494 Getting and Cleaning Data          Tidying Data with tidyr               6
+## 3495             R Programming                  Dates and Times              19
+## 3496 Getting and Cleaning Data Grouping and Chaining with dplyr              22
+## 3497             R Programming                  Dates and Times              12
+## 3498 Getting and Cleaning Data          Tidying Data with tidyr               6
+## 3499 Getting and Cleaning Data Grouping and Chaining with dplyr               9
+## 3500             R Programming               Subsetting Vectors              11
+## 3501 Getting and Cleaning Data     Manipulating Data with dplyr              22
+## 3502             R Programming                               Lo              NA
+## 3503             R Programming              Workspace and Files              27
+## 3504 Getting and Cleaning Data Grouping and Chaining with dplyr              14
+## 3505 Getting and Cleaning Data Grouping and Chaining with dplyr              16
+## 3506             R Programming                            Logic              12
+## 3507             R Programming                            Logic              13
+## 3508             R Programming                            Logic              15
+## 3509             R Programming                            Logic              17
+## 3510             R Programming                          Vectors              18
+## 3511             R Programming                          Vectors              19
+## 3512             R Programming               Subsetting Vectors              10
+## 3513 Getting and Cleaning Data     Manipulating Data with dplyr              21
+## 3514             R Programming                            Logic              30
+## 3515             R Programming                          Vectors               5
+## 3516             R Programming                          Vectors               6
+## 3517             R Programming              Workspace and Files              25
+## 3518             R Programming                  Looking at Data              13
+## 3519             R Programming            Basic Building Blocks              10
+## 3520             R Programming         Matrices and Data Frames              16
+## 3521 Getting and Cleaning Data          Tidying Data with tidyr               3
+## 3522             R Programming                   Missing Values              21
+## 3523             R Programming                   Missing Values              22
+## 3524 Getting and Cleaning Data          Tidying Data with tidyr               6
+## 3525             R Programming            Basic Building Blocks              25
+## 3526             R Programming                            Logic              28
+## 3527             R Programming               Subsetting Vectors               8
+## 3528             R Programming              Workspace and Files              22
+## 3529             R Programming              Workspace and Files              23
+## 3530             R Programming                  Looking at Data              27
+## 3531             R Programming                          Vectors               6
+## 3532             R Programming                          Vectors               7
+## 3533             R Programming                          Vectors               8
+## 3534             R Programming                          Vectors              11
+## 3535             R Programming                  Dates and Times              18
+## 3536             R Programming                          Vectors              17
+## 3537             R Programming               Subsetting Vectors              22
+## 3538 Getting and Cleaning Data Grouping and Chaining with dplyr               5
+## 3539             R Programming               Subsetting Vectors               5
+## 3540             R Programming                          Vectors              25
+## 3541 Getting and Cleaning Data     Manipulating Data with dplyr              18
+## 3542 Getting and Cleaning Data     Manipulating Data with dplyr              23
+## 3543             R Programming                          Vectors              30
+## 3544             R Programming                          Vectors              32
+## 3545             R Programming                          Vectors              33
+## 3546             R Programming                          Vectors              35
+## 3547             R Programming                          Vectors              39
+## 3548             R Programming                            Logic              14
+## 3549             R Programming              Workspace and Files               8
+## 3550             R Programming                            Logic              18
+## 3551             R Programming               Subsetting Vectors              23
+## 3552             R Programming                          Vectors              22
+## 3553             R Programming                            Logic              27
+## 3554             R Programming              Workspace and Files              21
+## 3555             R Programming              Workspace and Files              19
+## 3556             R Programming                   Missing Values              10
+## 3557             R Programming                   Missing Values              18
+## 3558             R Programming                   Missing Values              17
+## 3559             R Programming                  Looking at Data              11
+## 3560             R Programming            Basic Building Blocks              11
+## 3561             R Programming                   Missing Values              20
+## 3562             R Programming         Matrices and Data Frames              17
+## 3563             R Programming         Matrices and Data Frames              18
+## 3564             R Programming                   Missing Values              23
+## 3565             R Programming               Subsetting Vectors               3
+## 3566             R Programming            Basic Building Blocks              21
+## 3567             R Programming            Basic Building Blocks              22
+## 3568             R Programming            Basic Building Blocks              23
+## 3569             R Programming                  Looking at Data              28
+## 3570             R Programming                  Looking at Data              26
+## 3571             R Programming                            Logic               6
+## 3572             R Programming                            Logic               7
+## 3573             R Programming               Subsetting Vectors              14
+## 3574             R Programming               Subsetting Vectors              15
+## 3575 Getting and Cleaning Data Grouping and Chaining with dplyr              21
+## 3576             R Programming               Subsetting Vectors              21
+## 3577             R Programming              Workspace and Files               9
+## 3578             R Programming              Workspace and Files              10
+## 3579             R Programming               Subsetting Vectors              26
+## 3580             R Programming               Subsetting Vectors              27
+## 3581             R Programming                          Vectors              28
+## 3582             R Programming                          Vectors              29
+## 3583             R Programming                            Logic               4
+## 3584             R Programming                   Missing Values              12
+## 3585             R Programming                  Looking at Data              10
+## 3586             R Programming                            Logic               9
+## 3587             R Programming                            Logic              10
+## 3588             R Programming              Workspace and Files               5
+## 3589             R Programming                   Missing Values               4
+## 3590             R Programming            Basic Building Blocks              14
+## 3591             R Programming                                               NA
+## 3592             R Programming                            Logic              20
+## 3593             R Programming                            Logic              21
+## 3594             R Programming                            Logic              23
+## 3595             R Programming              Workspace and Files              17
+## 3596             R Programming                  Looking at Data               8
+## 3597             R Programming                  Looking at Data               4
+## 3598             R Programming                  Looking at Data               9
+## 3599             R Programming         Matrices and Data Frames               6
+## 3600             R Programming         Matrices and Data Frames              10
+## 3601             R Programming            Basic Building Blocks              12
+## 3602             R Programming                  Looking at Data              15
+## 3603             R Programming              Workspace and Files               6
+## 3604             R Programming         Matrices and Data Frames              13
+## 3605             R Programming            Basic Building Blocks              18
+## 3606             R Programming            Basic Building Blocks              17
+## 3607 Getting and Cleaning Data     Manipulating Data with dplyr              11
+## 3608 Getting and Cleaning Data     Manipulating Data with dplyr              12
+## 3609 Getting and Cleaning Data     Manipulating Data with dplyr              16
+## 3610             R Programming                  Looking at Data              22
+## 3611             R Programming         Matrices and Data Frames               3
+## 3612             R Programming         Matrices and Data Frames               5
+## 3613             R Programming         Matrices and Data Frames               4
+## 3614             R Programming         Matrices and Data Frames               7
+## 3615             R Programming               Subsetting Vectors              17
+## 3616             R Programming            Basic Building Blocks               3
+## 3617             R Programming               Subsetting Vectors              29
+## 3618             R Programming                   Missing Values               6
+## 3619             R Programming              Workspace and Files              11
+## 3620             R Programming              Workspace and Files              14
+## 3621             R Programming                  Looking at Data               6
+## 3622             R Programming                         Subsetti              NA
+## 3623             R Programming                   Missing Values               8
+## 3624             R Programming                  Looking at Data              20
+## 3625             R Programming         Matrices and Data Frames               9
+## 3626             R Programming         Matrices and Data Frames               3
+## 3627             R Programming            Basic Building Blocks              15
+## 3628             R Programming         Matrices and Data Frames              12
+## 3629 Getting and Cleaning Data     Manipulating Data with dplyr               7
+## 3630             R Programming              Workspace and Files              15
+## 3631             R Programming                   Missing Values               9
+## 3632             R Programming            Basic Building Blocks              16
+## 3633             R Programming                  Looking at Data               3
+## 3634 Getting and Cleaning Data     Manipulating Data with dplyr               6
+## 3635 Getting and Cleaning Data     Manipulating Data with dplyr               8
+## 3636             R Programming                  Looking at Data              17
+## 3637             R Programming         Matrices and Data Frames              14
+## 3638             R Programming                  Looking at Data              16
+## 3639             R Programming            Basic Building Blocks               8
+## 3640 Getting and Cleaning Data     Manipulating Data with dplyr              10
+## 3641             R Programming                   Missing Values               7
+## 3642 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 3643             R Programming                  Looking at Data               3
+## 3644 Getting and Cleaning Data     Manipulating Data with dplyr               5
+## 3645             R Programming                        Functions              11
+## 3646             R Programming                        Functions              28
+## 3647             R Programming                               Fu              NA
+## 3648             R Programming                        Functions               3
+## 3649             R Programming                        Functions              25
+## 3650             R Programming                        Functions              32
+## 3651             R Programming                        Functions               5
+## 3652             R Programming                        Functions               8
+## 3653             R Programming                        Functions              13
+## 3654             R Programming                        Functions              21
+## 3655             R Programming                        Functions              16
+## 3656             R Programming                        Functions              27
+## 3657             R Programming                        Functions              34
+## 3658             R Programming                        Functions              23
+## 3659             R Programming                        Functions              14
+## 3660             R Programming                        Functions               9
+## 3661             R Programming                        Functions               8
+## 3662             R Programming                        Functions              19
+## 3663             R Programming                        Functions              17
+## 3664             R Programming                          Vectors              19
+## 3665             R Programming                          Vectors              18
+## 3666             R Programming                          Vectors              32
+## 3667             R Programming                          Vectors              22
+## 3668             R Programming                   Missing Values               3
+## 3669             R Programming                   Missing Values               4
+## 3670             R Programming                   Missing Values               6
+## 3671             R Programming                   Missing Values               7
+## 3672             R Programming                   Missing Values               8
+## 3673             R Programming                          Vectors              23
+## 3674             R Programming                          Vectors              25
+## 3675             R Programming                          Vectors              28
+## 3676             R Programming                          Vectors              29
+## 3677             R Programming                          Vectors              30
+## 3678             R Programming                          Vectors              32
+## 3679             R Programming                   Missing Values              20
+## 3680             R Programming                   Missing Values              21
+## 3681             R Programming                          Vectors              33
+## 3682             R Programming                          Vectors              35
+## 3683             R Programming                          Vectors              39
+## 3684             R Programming                          Vectors              40
+## 3685             R Programming                          Vectors              41
+## 3686             R Programming                   Missing Values               9
+## 3687             R Programming                   Missing Values              10
+## 3688             R Programming                   Missing Values              12
+## 3689             R Programming                   Missing Values              17
+## 3690             R Programming                   Missing Values              18
+## 3691             R Programming                   Missing Values              19
+## 3692             R Programming               Subsetting Vectors              34
+## 3693             R Programming               Subsetting Vectors              36
+## 3694             R Programming               Subsetting Vectors              37
+## 3695             R Programming               Subsetting Vectors              38
+## 3696             R Programming               Subsetting Vectors              40
+## 3697             R Programming               Subsetting Vectors              41
+## 3698             R Programming               Subsetting Vectors              42
+## 3699             R Programming                            Logic               4
+## 3700             R Programming                            Logic               6
+## 3701             R Programming                            Logic               7
+## 3702             R Programming                            Logic               9
+## 3703             R Programming                            Logic              10
+## 3704             R Programming                            Logic              12
+## 3705             R Programming                            Logic              13
+## 3706             R Programming                            Logic              14
+## 3707             R Programming                            Logic              15
+## 3708             R Programming                   Missing Values              22
+## 3709             R Programming                   Missing Values              23
+## 3710             R Programming               Subsetting Vectors               3
+## 3711             R Programming               Subsetting Vectors               5
+## 3712             R Programming               Subsetting Vectors               8
+## 3713             R Programming               Subsetting Vectors               8
+## 3714             R Programming               Subsetting Vectors               9
+## 3715             R Programming               Subsetting Vectors              10
+## 3716             R Programming               Subsetting Vectors              11
+## 3717             R Programming               Subsetting Vectors              13
+## 3718             R Programming               Subsetting Vectors              13
+## 3719             R Programming               Subsetting Vectors              14
+## 3720             R Programming               Subsetting Vectors              15
+## 3721             R Programming               Subsetting Vectors              17
+## 3722             R Programming               Subsetting Vectors              21
+## 3723             R Programming               Subsetting Vectors              22
+## 3724             R Programming               Subsetting Vectors              23
+## 3725             R Programming               Subsetting Vectors              26
+## 3726             R Programming               Subsetting Vectors              27
+## 3727             R Programming               Subsetting Vectors              29
+## 3728             R Programming               Subsetting Vectors              30
+## 3729             R Programming               Subsetting Vectors              31
+## 3730             R Programming               Subsetting Vectors              32
+## 3731             R Programming               Subsetting Vectors              33
+## 3732             R Programming                            Logic              53
+## 3733             R Programming                            Logic              54
+## 3734             R Programming                            Logic              55
+## 3735             R Programming                  Dates and Times               3
+## 3736             R Programming                  Dates and Times               4
+## 3737             R Programming                  Dates and Times               5
+## 3738             R Programming                  Dates and Times               7
+## 3739             R Programming                  Dates and Times               8
+## 3740             R Programming                  Dates and Times               9
+## 3741             R Programming                  Dates and Times              11
+## 3742             R Programming                  Dates and Times              12
+## 3743             R Programming                  Dates and Times              13
+## 3744             R Programming                  Dates and Times              14
+## 3745             R Programming                  Dates and Times              15
+## 3746             R Programming                  Dates and Times              16
+## 3747             R Programming                  Dates and Times              17
+## 3748             R Programming                  Dates and Times              18
+## 3749             R Programming                  Dates and Times              19
+## 3750             R Programming                  Dates and Times              20
+## 3751             R Programming                  Dates and Times              22
+## 3752             R Programming                  Dates and Times              23
+## 3753             R Programming                  Dates and Times              24
+## 3754             R Programming                  Dates and Times              27
+## 3755             R Programming                  Dates and Times              28
+## 3756             R Programming                  Dates and Times              29
+## 3757             R Programming                  Dates and Times              30
+## 3758             R Programming                  Dates and Times              32
+## 3759             R Programming                  Dates and Times              33
+## 3760             R Programming                  Dates and Times              35
+## 3761             R Programming                  Dates and Times              37
+## 3762             R Programming                  Dates and Times              38
+## 3763             R Programming                  Dates and Times              39
+## 3764             R Programming                        Functions               3
+## 3765             R Programming                        Functions               5
+## 3766             R Programming                        Functions               5
+## 3767             R Programming                        Functions               8
+## 3768             R Programming                        Functions               9
+## 3769             R Programming                        Functions              11
+## 3770             R Programming                        Functions              13
+## 3771             R Programming                        Functions              14
+## 3772             R Programming                        Functions              16
+## 3773             R Programming                        Functions              16
+## 3774             R Programming                        Functions              16
+## 3775             R Programming                        Functions              17
+## 3776             R Programming                        Functions              19
+## 3777             R Programming                        Functions              21
+## 3778             R Programming                        Functions              23
+## 3779             R Programming                        Functions              25
+## 3780             R Programming                        Functions              27
+## 3781             R Programming                        Functions              28
+## 3782             R Programming                        Functions              32
+## 3783             R Programming                        Functions              34
+## 3784             R Programming                        Functions              34
+## 3785             R Programming                        Functions              35
+## 3786             R Programming                        Functions              35
+## 3787             R Programming                        Functions              36
+## 3788             R Programming                        Functions              38
+## 3789             R Programming                        Functions              40
+## 3790             R Programming                        Functions              41
+## 3791             R Programming                        Functions              42
+## 3792             R Programming                        Functions              42
+## 3793             R Programming                        Functions              42
+## 3794             R Programming                        Functions              42
+## 3795             R Programming                        Functions              43
+## 3796             R Programming                        Functions              47
+## 3797             R Programming                        Functions              47
+## 3798             R Programming                        Functions              47
+## 3799             R Programming                        Functions              48
+## 3800             R Programming                        Functions              50
+## 3801             R Programming                        Functions              51
+## 3802             R Programming                        Functions              52
+## 3803             R Programming         Matrices and Data Frames               3
+## 3804             R Programming         Matrices and Data Frames               3
+## 3805             R Programming         Matrices and Data Frames               4
+## 3806             R Programming         Matrices and Data Frames               5
+## 3807             R Programming         Matrices and Data Frames               6
+## 3808             R Programming         Matrices and Data Frames               7
+## 3809             R Programming         Matrices and Data Frames               9
+## 3810             R Programming         Matrices and Data Frames              10
+## 3811             R Programming         Matrices and Data Frames              12
+## 3812             R Programming         Matrices and Data Frames              13
+## 3813             R Programming         Matrices and Data Frames              14
+## 3814             R Programming         Matrices and Data Frames              16
+## 3815             R Programming         Matrices and Data Frames              17
+## 3816             R Programming         Matrices and Data Frames              18
+## 3817             R Programming         Matrices and Data Frames              21
+## 3818             R Programming         Matrices and Data Frames              22
+## 3819             R Programming         Matrices and Data Frames              26
+## 3820             R Programming         Matrices and Data Frames              27
+## 3821             R Programming         Matrices and Data Frames              30
+## 3822             R Programming         Matrices and Data Frames              33
+## 3823             R Programming         Matrices and Data Frames              34
+## 3824             R Programming         Matrices and Data Frames              34
+## 3825             R Programming         Matrices and Data Frames              35
+## 3826             R Programming         Matrices and Data Frames              37
+## 3827             R Programming         Matrices and Data Frames              38
+## 3828             R Programming         Matrices and Data Frames              39
+## 3829             R Programming                            Logic              17
+## 3830             R Programming                            Logic              18
+## 3831             R Programming                            Logic              20
+## 3832             R Programming                            Logic              21
+## 3833             R Programming                            Logic              23
+## 3834             R Programming                            Logic              27
+## 3835             R Programming                            Logic              28
+## 3836             R Programming                            Logic              30
+## 3837             R Programming                            Logic              32
+## 3838             R Programming                            Logic              33
+## 3839             R Programming                            Logic              35
+## 3840             R Programming                            Logic              36
+## 3841             R Programming                            Logic              37
+## 3842             R Programming                            Logic              38
+## 3843             R Programming                            Logic              39
+## 3844             R Programming                            Logic              41
+## 3845             R Programming                            Logic              42
+## 3846             R Programming                            Logic              43
+## 3847             R Programming                            Logic              44
+## 3848             R Programming                            Logic              46
+## 3849             R Programming                            Logic              47
+## 3850             R Programming                            Logic              49
+## 3851             R Programming                            Logic              50
+## 3852             R Programming                            Logic              51
+## 3853             R Programming                          Vectors               5
+## 3854             R Programming                          Vectors               5
+## 3855             R Programming                          Vectors               6
+## 3856             R Programming                          Vectors               7
+## 3857             R Programming                          Vectors               7
+## 3858             R Programming                          Vectors               8
+## 3859             R Programming                          Vectors              11
+## 3860             R Programming                          Vectors              17
+## 3861 Exploratory_Data_Analysis                 Plotting_Systems               5
+## 3862 Exploratory_Data_Analysis                 Plotting_Systems               7
+## 3863 Exploratory_Data_Analysis                 Plotting_Systems               7
+## 3864 Exploratory_Data_Analysis                 Plotting_Systems               9
+## 3865 Exploratory_Data_Analysis                 Plotting_Systems              11
+## 3866 Exploratory_Data_Analysis                 Plotting_Systems              16
+## 3867 Exploratory_Data_Analysis                 Plotting_Systems              17
+## 3868 Exploratory_Data_Analysis                 Plotting_Systems              19
+## 3869 Exploratory_Data_Analysis                 Plotting_Systems              19
+## 3870 Exploratory_Data_Analysis                 Plotting_Systems              20
+## 3871 Exploratory_Data_Analysis                 Plotting_Systems              21
+## 3872 Exploratory_Data_Analysis                 Plotting_Systems              25
+## 3873 Exploratory_Data_Analysis                 Plotting_Systems              26
+## 3874 Exploratory_Data_Analysis                 Plotting_Systems              27
+## 3875 Exploratory_Data_Analysis                 Plotting_Systems              28
+## 3876 Exploratory_Data_Analysis                 Plotting_Systems              31
+## 3877 Exploratory_Data_Analysis                 Plotting_Systems              32
+## 3878 Exploratory_Data_Analysis                 Plotting_Systems              33
+## 3879 Exploratory_Data_Analysis                 Plotting_Systems              34
+## 3880 Exploratory_Data_Analysis                 Plotting_Systems              35
+## 3881 Exploratory_Data_Analysis                 Plotting_Systems              36
+## 3882 Exploratory_Data_Analysis                 Plotting_Systems              38
+## 3883 Exploratory_Data_Analysis                 Plotting_Systems              39
+## 3884 Exploratory_Data_Analysis                 Plotting_Systems              40
+## 3885 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 3886 Getting and Cleaning Data     Manipulating Data with dplyr               5
+## 3887 Getting and Cleaning Data     Manipulating Data with dplyr               6
+## 3888 Getting and Cleaning Data     Manipulating Data with dplyr               7
+## 3889 Getting and Cleaning Data     Manipulating Data with dplyr               8
+## 3890 Getting and Cleaning Data     Manipulating Data with dplyr              10
+## 3891 Getting and Cleaning Data     Manipulating Data with dplyr              10
+## 3892 Getting and Cleaning Data     Manipulating Data with dplyr              10
+## 3893 Getting and Cleaning Data     Manipulating Data with dplyr              11
+## 3894 Getting and Cleaning Data     Manipulating Data with dplyr              12
+## 3895 Getting and Cleaning Data     Manipulating Data with dplyr              16
+## 3896 Getting and Cleaning Data     Manipulating Data with dplyr              18
+## 3897 Getting and Cleaning Data     Manipulating Data with dplyr              21
+## 3898 Getting and Cleaning Data     Manipulating Data with dplyr              22
+## 3899 Getting and Cleaning Data     Manipulating Data with dplyr              23
+## 3900 Getting and Cleaning Data     Manipulating Data with dplyr              24
+## 3901 Getting and Cleaning Data     Manipulating Data with dplyr              25
+## 3902 Getting and Cleaning Data     Manipulating Data with dplyr              26
+## 3903 Getting and Cleaning Data     Manipulating Data with dplyr              27
+## 3904 Getting and Cleaning Data     Manipulating Data with dplyr              28
+## 3905 Getting and Cleaning Data     Manipulating Data with dplyr              30
+## 3906 Getting and Cleaning Data     Manipulating Data with dplyr              33
+## 3907 Getting and Cleaning Data     Manipulating Data with dplyr              34
+## 3908 Getting and Cleaning Data     Manipulating Data with dplyr              35
+## 3909 Getting and Cleaning Data     Manipulating Data with dplyr              36
+## 3910 Getting and Cleaning Data     Manipulating Data with dplyr              37
+## 3911 Getting and Cleaning Data     Manipulating Data with dplyr              37
+## 3912 Getting and Cleaning Data     Manipulating Data with dplyr              39
+## 3913 Getting and Cleaning Data     Manipulating Data with dplyr              40
+## 3914 Getting and Cleaning Data     Manipulating Data with dplyr              41
+## 3915 Getting and Cleaning Data     Manipulating Data with dplyr              44
+## 3916 Getting and Cleaning Data     Manipulating Data with dplyr              45
+## 3917 Getting and Cleaning Data     Manipulating Data with dplyr              46
+## 3918 Getting and Cleaning Data     Manipulating Data with dplyr              47
+## 3919 Getting and Cleaning Data     Manipulating Data with dplyr              48
+## 3920 Getting and Cleaning Data     Manipulating Data with dplyr              49
+## 3921 Getting and Cleaning Data     Manipulating Data with dplyr              50
+## 3922 Getting and Cleaning Data     Manipulating Data with dplyr              53
+## 3923 Getting and Cleaning Data     Manipulating Data with dplyr              55
+## 3924 Getting and Cleaning Data     Manipulating Data with dplyr              56
+## 3925 Getting and Cleaning Data     Manipulating Data with dplyr              57
+## 3926 Getting and Cleaning Data     Manipulating Data with dplyr              61
+## 3927 Getting and Cleaning Data     Manipulating Data with dplyr              62
+## 3928 Getting and Cleaning Data     Manipulating Data with dplyr              63
+## 3929 Exploratory_Data_Analysis             Base_Plotting_System              54
+## 3930 Exploratory_Data_Analysis             Base_Plotting_System              56
+## 3931 Exploratory_Data_Analysis             Base_Plotting_System              58
+## 3932 Exploratory_Data_Analysis             Base_Plotting_System              60
+## 3933 Exploratory_Data_Analysis             Base_Plotting_System              60
+## 3934 Exploratory_Data_Analysis             Base_Plotting_System              60
+## 3935 Exploratory_Data_Analysis             Base_Plotting_System              62
+## 3936 Exploratory_Data_Analysis             Base_Plotting_System              64
+## 3937 Exploratory_Data_Analysis             Base_Plotting_System              67
+## 3938 Exploratory_Data_Analysis             Base_Plotting_System              68
+## 3939 Exploratory_Data_Analysis             Base_Plotting_System              69
+## 3940 Getting and Cleaning Data Grouping and Chaining with dplyr              34
+## 3941 Getting and Cleaning Data Grouping and Chaining with dplyr              35
+## 3942 Getting and Cleaning Data Grouping and Chaining with dplyr              39
+## 3943 Getting and Cleaning Data Grouping and Chaining with dplyr              42
+## 3944 Getting and Cleaning Data Grouping and Chaining with dplyr              43
+## 3945 Getting and Cleaning Data Grouping and Chaining with dplyr              45
+## 3946 Getting and Cleaning Data Grouping and Chaining with dplyr              48
+## 3947 Getting and Cleaning Data Grouping and Chaining with dplyr              49
+## 3948 Getting and Cleaning Data Grouping and Chaining with dplyr              49
+## 3949 Getting and Cleaning Data Grouping and Chaining with dplyr              49
+## 3950 Getting and Cleaning Data Grouping and Chaining with dplyr              50
+## 3951 Getting and Cleaning Data Grouping and Chaining with dplyr              51
+## 3952 Getting and Cleaning Data Grouping and Chaining with dplyr              53
+## 3953 Getting and Cleaning Data Grouping and Chaining with dplyr              54
+## 3954 Getting and Cleaning Data Grouping and Chaining with dplyr              55
+## 3955             R Programming                  Looking at Data               3
+## 3956             R Programming                  Looking at Data               3
+## 3957             R Programming                  Looking at Data               4
+## 3958             R Programming                  Looking at Data               6
+## 3959 Getting and Cleaning Data Grouping and Chaining with dplyr               5
+## 3960 Getting and Cleaning Data Grouping and Chaining with dplyr               6
+## 3961 Getting and Cleaning Data Grouping and Chaining with dplyr               7
+## 3962 Getting and Cleaning Data Grouping and Chaining with dplyr               8
+## 3963 Getting and Cleaning Data Grouping and Chaining with dplyr               9
+## 3964 Getting and Cleaning Data Grouping and Chaining with dplyr              10
+## 3965 Getting and Cleaning Data Grouping and Chaining with dplyr              11
+## 3966 Getting and Cleaning Data Grouping and Chaining with dplyr              14
+## 3967 Getting and Cleaning Data Grouping and Chaining with dplyr              16
+## 3968 Getting and Cleaning Data Grouping and Chaining with dplyr              17
+## 3969 Getting and Cleaning Data Grouping and Chaining with dplyr              21
+## 3970 Getting and Cleaning Data Grouping and Chaining with dplyr              22
+## 3971 Getting and Cleaning Data Grouping and Chaining with dplyr              23
+## 3972 Getting and Cleaning Data Grouping and Chaining with dplyr              25
+## 3973 Getting and Cleaning Data Grouping and Chaining with dplyr              26
+## 3974 Getting and Cleaning Data Grouping and Chaining with dplyr              26
+## 3975 Getting and Cleaning Data Grouping and Chaining with dplyr              27
+## 3976 Getting and Cleaning Data Grouping and Chaining with dplyr              31
+## 3977 Getting and Cleaning Data Grouping and Chaining with dplyr              32
+## 3978 Getting and Cleaning Data Grouping and Chaining with dplyr              33
+## 3979 Getting and Cleaning Data Grouping and Chaining with dplyr              34
+## 3980 Exploratory_Data_Analysis             Base_Plotting_System              18
+## 3981 Exploratory_Data_Analysis             Base_Plotting_System              19
+## 3982 Exploratory_Data_Analysis             Base_Plotting_System              20
+## 3983 Exploratory_Data_Analysis             Base_Plotting_System              20
+## 3984 Exploratory_Data_Analysis             Base_Plotting_System              22
+## 3985 Exploratory_Data_Analysis             Base_Plotting_System              23
+## 3986 Exploratory_Data_Analysis             Base_Plotting_System              23
+## 3987 Exploratory_Data_Analysis             Base_Plotting_System              24
+## 3988 Exploratory_Data_Analysis             Base_Plotting_System              25
+## 3989 Exploratory_Data_Analysis             Base_Plotting_System              26
+## 3990 Exploratory_Data_Analysis             Base_Plotting_System              27
+## 3991 Exploratory_Data_Analysis             Base_Plotting_System              28
+## 3992 Exploratory_Data_Analysis             Base_Plotting_System              30
+## 3993 Exploratory_Data_Analysis             Base_Plotting_System              31
+## 3994 Exploratory_Data_Analysis             Base_Plotting_System              32
+## 3995 Exploratory_Data_Analysis             Base_Plotting_System              33
+## 3996 Exploratory_Data_Analysis             Base_Plotting_System              36
+## 3997 Exploratory_Data_Analysis             Base_Plotting_System              40
+## 3998 Exploratory_Data_Analysis             Base_Plotting_System              43
+## 3999             R Programming                  Looking at Data               8
+## 4000             R Programming                  Looking at Data               9
+## 4001             R Programming                  Looking at Data              10
+## 4002             R Programming                  Looking at Data              11
+## 4003             R Programming                  Looking at Data              13
+## 4004             R Programming                  Looking at Data              15
+## 4005             R Programming                  Looking at Data              16
+## 4006             R Programming                  Looking at Data              17
+## 4007             R Programming                  Looking at Data              20
+## 4008             R Programming                  Looking at Data              20
+## 4009             R Programming                  Looking at Data              22
+## 4010             R Programming                  Looking at Data              26
+## 4011             R Programming                  Looking at Data              27
+## 4012             R Programming                  Looking at Data              28
+## 4013 Exploratory_Data_Analysis             Base_Plotting_System               6
+## 4014 Exploratory_Data_Analysis             Base_Plotting_System              11
+## 4015 Exploratory_Data_Analysis             Base_Plotting_System              12
+## 4016 Exploratory_Data_Analysis             Base_Plotting_System              13
+## 4017 Exploratory_Data_Analysis             Base_Plotting_System              14
+## 4018 Exploratory_Data_Analysis             Base_Plotting_System              15
+## 4019 Exploratory_Data_Analysis             Base_Plotting_System              16
+## 4020 Exploratory_Data_Analysis               Clustering_Example              12
+## 4021 Exploratory_Data_Analysis               Clustering_Example              13
+## 4022 Exploratory_Data_Analysis               Clustering_Example              14
+## 4023 Exploratory_Data_Analysis               Clustering_Example              16
+## 4024 Exploratory_Data_Analysis               Clustering_Example              17
+## 4025 Exploratory_Data_Analysis               Clustering_Example              18
+## 4026 Exploratory_Data_Analysis               Clustering_Example              19
+## 4027 Exploratory_Data_Analysis               Clustering_Example              21
+## 4028 Exploratory_Data_Analysis               Clustering_Example              23
+## 4029 Exploratory_Data_Analysis               Clustering_Example              24
+## 4030 Exploratory_Data_Analysis               Clustering_Example              25
+## 4031 Exploratory_Data_Analysis               Clustering_Example              28
+## 4032 Exploratory_Data_Analysis               Clustering_Example              29
+## 4033 Exploratory_Data_Analysis               Clustering_Example              30
+## 4034 Exploratory_Data_Analysis               Clustering_Example              31
+## 4035 Exploratory_Data_Analysis               Clustering_Example              33
+## 4036 Exploratory_Data_Analysis               Clustering_Example              34
+## 4037 Exploratory_Data_Analysis               Clustering_Example              34
+## 4038 Exploratory_Data_Analysis               Clustering_Example              35
+## 4039 Exploratory_Data_Analysis             Base_Plotting_System              43
+## 4040 Exploratory_Data_Analysis             Base_Plotting_System              44
+## 4041 Exploratory_Data_Analysis             Base_Plotting_System              45
+## 4042 Exploratory_Data_Analysis             Base_Plotting_System              45
+## 4043 Exploratory_Data_Analysis             Base_Plotting_System              46
+## 4044 Exploratory_Data_Analysis             Base_Plotting_System              47
+## 4045 Exploratory_Data_Analysis             Base_Plotting_System              48
+## 4046 Exploratory_Data_Analysis             Base_Plotting_System              49
+## 4047 Exploratory_Data_Analysis             Base_Plotting_System              50
+## 4048 Exploratory_Data_Analysis             Base_Plotting_System              51
+## 4049 Exploratory_Data_Analysis             Base_Plotting_System              52
+## 4050 Exploratory_Data_Analysis               Clustering_Example              55
+## 4051 Exploratory_Data_Analysis               Clustering_Example               5
+## 4052 Exploratory_Data_Analysis               Clustering_Example               8
+## 4053 Exploratory_Data_Analysis               Clustering_Example               8
+## 4054 Exploratory_Data_Analysis               Clustering_Example               9
+## 4055 Exploratory_Data_Analysis               Clustering_Example              10
+## 4056 Exploratory_Data_Analysis               Clustering_Example              10
+## 4057 Exploratory_Data_Analysis               Clustering_Example              10
+## 4058 Exploratory_Data_Analysis               Clustering_Example              11
+## 4059 Exploratory_Data_Analysis               Clustering_Example              11
+## 4060 Exploratory_Data_Analysis               Clustering_Example              48
+## 4061 Exploratory_Data_Analysis               Clustering_Example              50
+## 4062 Exploratory_Data_Analysis               Clustering_Example              51
+## 4063 Exploratory_Data_Analysis               Clustering_Example              53
+## 4064 Exploratory_Data_Analysis               Clustering_Example              41
+## 4065 Exploratory_Data_Analysis               Clustering_Example              56
+## 4066 Exploratory_Data_Analysis               Clustering_Example              40
+## 4067 Exploratory_Data_Analysis               Clustering_Example              40
+## 4068 Exploratory_Data_Analysis               Clustering_Example              47
+## 4069 Exploratory_Data_Analysis               Clustering_Example              42
+## 4070 Exploratory_Data_Analysis               Clustering_Example              43
+## 4071 Exploratory_Data_Analysis               Clustering_Example              45
+## 4072 Exploratory_Data_Analysis               Clustering_Example              59
+## 4073 Exploratory_Data_Analysis               Clustering_Example              60
+## 4074 Exploratory_Data_Analysis               Clustering_Example              65
+## 4075 Exploratory_Data_Analysis               Clustering_Example              57
+## 4076 Exploratory_Data_Analysis               Clustering_Example              67
+## 4077 Exploratory_Data_Analysis               Clustering_Example              66
+## 4078             R Programming            Basic Building Blocks              15
+## 4079             R Programming            Basic Building Blocks              12
+## 4080             R Programming                            Logic              37
+## 4081             R Programming                        Functions              38
+## 4082             R Programming                  Dates and Times              27
+## 4083             R Programming            Basic Building Blocks              14
+## 4084             R Programming                        Functions              40
+## 4085             R Programming                            Logic              38
+## 4086             R Programming            Basic Building Blocks              11
+## 4087             R Programming                  Dates and Times              27
+## 4088             R Programming                  Dates and Times              27
+## 4089             R Programming                  Dates and Times              27
+## 4090             R Programming                        Functions              36
+## 4091             R Programming            Basic Building Blocks              10
+## 4092             R Programming            Basic Building Blocks              16
+## 4093             R Programming              Workspace and Files              15
+## 4094             R Programming                            Logic              39
+## 4095             R Programming               Subsetting Vectors              15
+## 4096             R Programming            Basic Building Blocks               8
+## 4097             R Programming                  Dates and Times              38
+## 4098             R Programming               Subsetting Vectors              13
+## 4099             R Programming              Workspace and Files              22
+## 4100             R Programming              Workspace and Files              14
+## 4101             R Programming                        Functions               8
+## 4102             R Programming                  Dates and Times              39
+## 4103             R Programming               Subsetting Vectors              14
+## 4104             R Programming                  Dates and Times               8
+## 4105             R Programming              Workspace and Files              17
+## 4106             R Programming                        Functions               8
+## 4107             R Programming               Subsetting Vectors              11
+## 4108             R Programming              Workspace and Files              14
+## 4109             R Programming                        Functions              35
+## 4110             R Programming                        Functions              13
+## 4111             R Programming              Workspace and Files              15
+## 4112             R Programming              Workspace and Files              17
+## 4113             R Programming              Workspace and Files              11
+## 4114             R Programming                          Vectors               7
+## 4115             R Programming                        Functions              13
+## 4116             R Programming               Subsetting Vectors              10
+## 4117             R Programming                  Dates and Times              29
+## 4118             R Programming                  Dates and Times              30
+## 4119             R Programming                          Vectors               8
+## 4120             R Programming                  Dates and Times              28
+## 4121             R Programming              Workspace and Files              22
+## 4122             R Programming                  Dates and Times              37
+## 4123             R Programming            Basic Building Blocks               3
+## 4124             R Programming               Subsetting Vectors               8
+## 4125             R Programming               Subsetting Vectors               9
+## 4126             R Programming              Workspace and Files              10
+## 4127             R Programming                        Functions               8
+## 4128             R Programming                            Logic              51
+## 4129             R Programming                            Logic              53
+## 4130             R Programming                            Logic              54
+## 4131             R Programming                            Logic              55
+## 4132             R Programming              Workspace and Files              19
+## 4133             R Programming              Workspace and Files              21
+## 4134             R Programming                  Dates and Times               7
+## 4135             R Programming                        Functions              13
+## 4136             R Programming               Subsetting Vectors              23
+## 4137             R Programming               Subsetting Vectors              26
+## 4138             R Programming               Subsetting Vectors              27
+## 4139             R Programming                        Functions               3
+## 4140             R Programming                          Vectors               6
+## 4141             R Programming                            Logic              33
+## 4142             R Programming                            Logic              35
+## 4143             R Programming                            Logic              36
+## 4144             R Programming                        Functions              41
+## 4145             R Programming                  Dates and Times              32
+## 4146             R Programming                  Dates and Times              33
+## 4147             R Programming                  Dates and Times              35
+## 4148             R Programming                        Functions              35
+## 4149             R Programming            Basic Building Blocks              40
+## 4150             R Programming            Basic Building Blocks              41
+## 4151             R Programming               Subsetting Vectors              42
+## 4152             R Programming                        Functions              14
+## 4153             R Programming                        Functions               5
+## 4154             R Programming                        Functions               8
+## 4155             R Programming                          Vectors              35
+## 4156             R Programming                          Vectors              39
+## 4157             R Programming                          Vectors              40
+## 4158             R Programming               Subsetting Vectors              17
+## 4159             R Programming               Subsetting Vectors              21
+## 4160             R Programming               Subsetting Vectors              21
+## 4161             R Programming               Subsetting Vectors              22
+## 4162             R Programming              Workspace and Files               5
+## 4163             R Programming              Workspace and Files               6
+## 4164             R Programming              Workspace and Files               8
+## 4165             R Programming              Workspace and Files               9
+## 4166             R Programming                  Dates and Times              27
+## 4167             R Programming                            Logic              32
+## 4168             R Programming                  Dates and Times              24
+## 4169             R Programming                            Logic              50
+## 4170             R Programming              Workspace and Files              27
+## 4171             R Programming                        Functions               8
+## 4172             R Programming                  Dates and Times               3
+## 4173             R Programming                  Dates and Times               4
+## 4174             R Programming                  Dates and Times               5
+## 4175             R Programming                            Logic              41
+## 4176             R Programming                            Logic              42
+## 4177             R Programming                            Logic              43
+## 4178             R Programming                            Logic              44
+## 4179             R Programming                            Logic              46
+## 4180             R Programming                            Logic              47
+## 4181             R Programming                            Logic              49
+## 4182             R Programming                        Functions              17
+## 4183             R Programming                        Functions              19
+## 4184             R Programming                          Vectors              11
+## 4185             R Programming                          Vectors              17
+## 4186             R Programming                          Vectors              18
+## 4187             R Programming                            Logic              41
+## 4188             R Programming              Workspace and Files              34
+## 4189             R Programming              Workspace and Files              34
+## 4190             R Programming              Workspace and Files              35
+## 4191             R Programming              Workspace and Files              40
+## 4192             R Programming              Workspace and Files              41
+## 4193             R Programming              Workspace and Files              42
+## 4194             R Programming                            Logic               9
+## 4195             R Programming                  Dates and Times              23
+## 4196             R Programming                          Vectors              33
+## 4197             R Programming              Workspace and Files              29
+## 4198             R Programming              Workspace and Files              31
+## 4199             R Programming              Workspace and Files              32
+## 4200             R Programming              Workspace and Files              33
+## 4201             R Programming                            Logic              20
+## 4202             R Programming                        Functions              32
+## 4203             R Programming                        Functions              34
+## 4204             R Programming                        Functions              34
+## 4205             R Programming                            Logic              28
+## 4206             R Programming                            Logic              30
+## 4207             R Programming                          Vectors               5
+## 4208             R Programming                          Vectors              32
+## 4209             R Programming                        Functions              16
+## 4210             R Programming            Basic Building Blocks              26
+## 4211             R Programming            Basic Building Blocks              27
+## 4212             R Programming            Basic Building Blocks              31
+## 4213             R Programming            Basic Building Blocks              33
+## 4214             R Programming                          Vectors              19
+## 4215             R Programming                          Vectors              22
+## 4216             R Programming                          Vectors              23
+## 4217             R Programming                          Vectors              25
+## 4218             R Programming                          Vectors              28
+## 4219             R Programming                          Vectors              29
+## 4220             R Programming                          Vectors              30
+## 4221             R Programming                        Functions              16
+## 4222             R Programming            Basic Building Blocks              23
+## 4223             R Programming                   Missing Values              17
+## 4224             R Programming                   Missing Values              18
+## 4225             R Programming                        Functions              21
+## 4226             R Programming                            Logic              17
+## 4227             R Programming                        Functions               9
+## 4228             R Programming                        Functions              11
+## 4229             R Programming                        Functions              13
+## 4230             R Programming                   Missing Values               8
+## 4231             R Programming                   Missing Values               9
+## 4232             R Programming                   Missing Values               9
+## 4233             R Programming                   Missing Values              10
+## 4234             R Programming                  Dates and Times              22
+## 4235             R Programming                            Logic               6
+## 4236             R Programming            Basic Building Blocks              25
+## 4237             R Programming              Workspace and Files              25
+## 4238             R Programming               Subsetting Vectors              31
+## 4239             R Programming               Subsetting Vectors              32
+## 4240             R Programming                            Logic              18
+## 4241             R Programming                        Functions              27
+## 4242             R Programming                            Logic              21
+## 4243             R Programming                            Logic              23
+## 4244             R Programming                            Logic              27
+## 4245             R Programming               Subsetting Vectors               8
+## 4246             R Programming                  Dates and Times              20
+## 4247             R Programming            Basic Building Blocks              22
+## 4248             R Programming                        Functions              51
+## 4249             R Programming                            Logic               7
+## 4250             R Programming                  Dates and Times              12
+## 4251             R Programming                            Logic              10
+## 4252             R Programming                            Logic              12
+## 4253             R Programming               Subsetting Vectors              33
+## 4254             R Programming                        Functions              42
+## 4255             R Programming                        Functions              43
+## 4256             R Programming            Basic Building Blocks              17
+## 4257             R Programming            Basic Building Blocks              17
+## 4258             R Programming            Basic Building Blocks              18
+## 4259             R Programming            Basic Building Blocks              21
+## 4260             R Programming                            Logic               4
+## 4261             R Programming                  Dates and Times              13
+## 4262             R Programming                        Functions              52
+## 4263             R Programming              Workspace and Files              23
+## 4264             R Programming               Subsetting Vectors              30
+## 4265             R Programming            Basic Building Blocks              39
+## 4266             R Programming                        Functions              23
+## 4267             R Programming            Basic Building Blocks              36
+## 4268             R Programming            Basic Building Blocks              38
+## 4269             R Programming                        Functions              50
+## 4270             R Programming               Subsetting Vectors              40
+## 4271             R Programming               Subsetting Vectors              41
+## 4272             R Programming                   Missing Values               7
+## 4273             R Programming               Subsetting Vectors              29
+## 4274             R Programming                        Functions              28
+## 4275             R Programming                  Dates and Times               9
+## 4276             R Programming                  Dates and Times              11
+## 4277             R Programming                            Logic              15
+## 4278             R Programming                  Dates and Times              18
+## 4279             R Programming                  Dates and Times              14
+## 4280             R Programming                        Functions              25
+## 4281             R Programming                  Dates and Times              19
+## 4282             R Programming               Subsetting Vectors              34
+## 4283             R Programming               Subsetting Vectors               3
+## 4284             R Programming               Subsetting Vectors               5
+## 4285             R Programming                            Logic              13
+## 4286             R Programming                        Functions              48
+## 4287             R Programming                          Vectors              41
+## 4288             R Programming                   Missing Values              12
+## 4289             R Programming                        Functions              47
+## 4290             R Programming                   Missing Values               4
+## 4291             R Programming                            Logic              14
+## 4292             R Programming                   Missing Values               3
+## 4293             R Programming                   Missing Values              21
+## 4294             R Programming               Subsetting Vectors              36
+## 4295             R Programming                   Missing Values               6
+## 4296             R Programming                  Dates and Times              16
+## 4297             R Programming                   Missing Values              20
+## 4298             R Programming                  Dates and Times              17
+## 4299             R Programming                   Missing Values              22
+## 4300             R Programming                   Missing Values              19
+## 4301             R Programming               Subsetting Vectors              38
+## 4302             R Programming                   Missing Values              20
+## 4303             R Programming                   Missing Values              23
+## 4304             R Programming                  Dates and Times              16
+## 4305             R Programming               Subsetting Vectors              37
+## 4306             R Programming                  Dates and Times              15
+## 4307             R Programming              Workspace and Files              32
+## 4308             R Programming              Workspace and Files              29
+## 4309             R Programming                            Logic              23
+## 4310             R Programming                   Missing Values              10
+## 4311             R Programming                            Logic              20
+## 4312             R Programming               Subsetting Vectors              22
+## 4313             R Programming              Workspace and Files              31
+## 4314             R Programming              Workspace and Files              34
+## 4315             R Programming                   Missing Values               9
+## 4316             R Programming              Workspace and Files              27
+## 4317             R Programming              Workspace and Files              27
+## 4318             R Programming                            Logic              21
+## 4319             R Programming                  Dates and Times              14
+## 4320             R Programming                            Logic              17
+## 4321             R Programming                   Missing Values              12
+## 4322             R Programming                            Logic              18
+## 4323             R Programming                        Functions              32
+## 4324             R Programming               Subsetting Vectors              42
+## 4325             R Programming                          Vectors              39
+## 4326             R Programming               Subsetting Vectors               5
+## 4327             R Programming            Basic Building Blocks              25
+## 4328             R Programming               Subsetting Vectors               8
+## 4329             R Programming               Subsetting Vectors               9
+## 4330             R Programming              Workspace and Files              23
+## 4331             R Programming              Workspace and Files              25
+## 4332             R Programming                            Logic              15
+## 4333             R Programming              Workspace and Files               6
+## 4334             R Programming               Subsetting Vectors              15
+## 4335             R Programming              Workspace and Files              33
+## 4336             R Programming               Subsetting Vectors              21
+## 4337             R Programming            Basic Building Blocks              38
+## 4338             R Programming            Basic Building Blocks              39
+## 4339             R Programming              Workspace and Files              34
+## 4340             R Programming               Subsetting Vectors               3
+## 4341             R Programming                            Logic               9
+## 4342             R Programming            Basic Building Blocks              26
+## 4343             R Programming               Subsetting Vectors              10
+## 4344             R Programming               Subsetting Vectors              11
+## 4345             R Programming            Basic Building Blocks              31
+## 4346             R Programming            Basic Building Blocks              31
+## 4347             R Programming               Subsetting Vectors              14
+## 4348             R Programming               Subsetting Vectors              17
+## 4349             R Programming                  Dates and Times              13
+## 4350             R Programming                          Vectors               7
+## 4351             R Programming                          Vectors               8
+## 4352             R Programming            Basic Building Blocks              40
+## 4353             R Programming                            Logic              27
+## 4354             R Programming              Workspace and Files              35
+## 4355             R Programming              Workspace and Files              40
+## 4356             R Programming            Basic Building Blocks              26
+## 4357             R Programming            Basic Building Blocks              27
+## 4358             R Programming                        Functions               3
+## 4359             R Programming                        Functions               5
+## 4360             R Programming               Subsetting Vectors              13
+## 4361             R Programming                  Dates and Times              12
+## 4362             R Programming            Basic Building Blocks              36
+## 4363             R Programming               Subsetting Vectors              41
+## 4364             R Programming                        Functions              11
+## 4365             R Programming                        Functions              13
+## 4366             R Programming                          Vectors              40
+## 4367             R Programming                          Vectors              41
+## 4368             R Programming                        Functions              16
+## 4369             R Programming              Workspace and Files              19
+## 4370             R Programming              Workspace and Files              21
+## 4371             R Programming              Workspace and Files              22
+## 4372             R Programming              Workspace and Files              22
+## 4373             R Programming                        Functions               8
+## 4374             R Programming            Basic Building Blocks              33
+## 4375             R Programming                          Vectors               7
+## 4376             R Programming                        Functions              28
+## 4377             R Programming                  Dates and Times              11
+## 4378             R Programming                  Dates and Times               9
+## 4379             R Programming                          Vectors              11
+## 4380             R Programming            Basic Building Blocks              41
+## 4381             R Programming                            Logic              28
+## 4382             R Programming                            Logic              30
+## 4383             R Programming              Workspace and Files              41
+## 4384             R Programming              Workspace and Files              42
+## 4385             R Programming                          Vectors               5
+## 4386             R Programming              Workspace and Files              22
+## 4387             R Programming              Workspace and Files               8
+## 4388             R Programming               Subsetting Vectors              40
+## 4389             R Programming                          Vectors               6
+## 4390             R Programming                            Logic              41
+## 4391             R Programming                            Logic              41
+## 4392             R Programming                          Vectors              35
+## 4393             R Programming                            Logic              42
+## 4394             R Programming                          Vectors              17
+## 4395             R Programming                          Vectors              18
+## 4396             R Programming                            Logic              43
+## 4397             R Programming                          Vectors              19
+## 4398             R Programming                          Vectors              23
+## 4399             R Programming                          Vectors              25
+## 4400             R Programming              Workspace and Files              23
+## 4401             R Programming                            Logic              15
+## 4402             R Programming                        Functions               8
+## 4403             R Programming                        Functions               9
+## 4404             R Programming                          Vectors              33
+## 4405             R Programming                  Dates and Times               8
+## 4406             R Programming            Basic Building Blocks              18
+## 4407             R Programming            Basic Building Blocks              21
+## 4408             R Programming            Basic Building Blocks              22
+## 4409             R Programming            Basic Building Blocks              23
+## 4410             R Programming                            Logic              10
+## 4411             R Programming                            Logic              12
+## 4412             R Programming                            Logic              13
+## 4413             R Programming                          Vectors              28
+## 4414             R Programming                        Functions               8
+## 4415             R Programming                        Functions              27
+## 4416             R Programming                   Missing Values               7
+## 4417             R Programming                   Missing Values               8
+## 4418             R Programming                            Logic              39
+## 4419             R Programming                            Logic              41
+## 4420             R Programming                        Functions              34
+## 4421             R Programming               Subsetting Vectors              23
+## 4422             R Programming                   Missing Values              17
+## 4423             R Programming                            Logic              32
+## 4424             R Programming                            Logic              32
+## 4425             R Programming                            Logic              33
+## 4426             R Programming                            Logic              14
+## 4427             R Programming                            Logic              15
+## 4428             R Programming                          Vectors               6
+## 4429             R Programming                            Logic              37
+## 4430             R Programming                            Logic              38
+## 4431             R Programming              Workspace and Files               9
+## 4432             R Programming              Workspace and Files              10
+## 4433             R Programming               Subsetting Vectors              33
+## 4434             R Programming               Subsetting Vectors              33
+## 4435             R Programming               Subsetting Vectors              33
+## 4436             R Programming                          Vectors              18
+## 4437             R Programming               Subsetting Vectors              34
+## 4438             R Programming               Subsetting Vectors              36
+## 4439             R Programming               Subsetting Vectors              36
+## 4440             R Programming              Workspace and Files               5
+## 4441             R Programming               Subsetting Vectors              37
+## 4442             R Programming               Subsetting Vectors              38
+## 4443             R Programming                          Vectors              28
+## 4444             R Programming                  Dates and Times               8
+## 4445             R Programming               Subsetting Vectors              32
+## 4446             R Programming                            Logic               4
+## 4447             R Programming                            Logic               6
+## 4448             R Programming                            Logic               7
+## 4449             R Programming              Workspace and Files              15
+## 4450             R Programming                        Functions              17
+## 4451             R Programming                        Functions              19
+## 4452             R Programming                        Functions              21
+## 4453             R Programming                        Functions              23
+## 4454             R Programming                        Functions              25
+## 4455             R Programming                   Missing Values               6
+## 4456             R Programming                  Dates and Times               7
+## 4457             R Programming               Subsetting Vectors              32
+## 4458             R Programming                          Vectors              29
+## 4459             R Programming                            Logic              41
+## 4460             R Programming               Subsetting Vectors              32
+## 4461             R Programming               Subsetting Vectors              33
+## 4462             R Programming                          Vectors               8
+## 4463             R Programming                        Functions              35
+## 4464             R Programming                   Missing Values              20
+## 4465             R Programming                   Missing Values              20
+## 4466             R Programming                            Logic              35
+## 4467             R Programming                          Vectors               5
+## 4468             R Programming                            Logic              36
+## 4469             R Programming               Subsetting Vectors              31
+## 4470             R Programming                          Vectors              29
+## 4471             R Programming                          Vectors               5
+## 4472             R Programming                          Vectors              30
+## 4473             R Programming                          Vectors              32
+## 4474             R Programming                        Functions              14
+## 4475             R Programming                        Functions              16
+## 4476             R Programming               Subsetting Vectors              33
+## 4477             R Programming            Basic Building Blocks               8
+## 4478             R Programming                            Logic              44
+## 4479             R Programming                            Logic              46
+## 4480             R Programming                          Vectors              22
+## 4481             R Programming                          Vectors              23
+## 4482             R Programming                          Vectors              25
+## 4483             R Programming               Subsetting Vectors              30
+## 4484             R Programming                            Logic              50
+## 4485             R Programming                          Vectors               6
+## 4486             R Programming                          Vectors               6
+## 4487             R Programming                          Vectors               7
+## 4488             R Programming                          Vectors               7
+## 4489             R Programming                          Vectors              39
+## 4490             R Programming                          Vectors              11
+## 4491             R Programming              Workspace and Files              17
+## 4492             R Programming                          Vectors              41
+## 4493             R Programming                   Missing Values               3
+## 4494             R Programming                   Missing Values               4
+## 4495             R Programming                  Dates and Times               5
+## 4496             R Programming            Basic Building Blocks              14
+## 4497             R Programming                          Vectors               5
+## 4498             R Programming                          Vectors              30
+## 4499             R Programming                          Vectors              32
+## 4500             R Programming            Basic Building Blocks              17
+## 4501             R Programming              Workspace and Files              11
+## 4502             R Programming                        Functions              48
+## 4503             R Programming              Workspace and Files              15
+## 4504             R Programming                  Dates and Times              15
+## 4505             R Programming                   Missing Values              18
+## 4506             R Programming                   Missing Values              21
+## 4507             R Programming                   Missing Values              22
+## 4508             R Programming               Subsetting Vectors              29
+## 4509             R Programming                   Missing Values              23
+## 4510             R Programming                            Logic              49
+## 4511             R Programming                        Functions              40
+## 4512             R Programming                        Functions              41
+## 4513             R Programming                        Functions              42
+## 4514             R Programming                        Functions              43
+## 4515             R Programming              Workspace and Files              14
+## 4516             R Programming                  Dates and Times              24
+## 4517             R Programming                          Vectors              17
+## 4518             R Programming                          Vectors              19
+## 4519             R Programming                          Vectors              22
+## 4520             R Programming            Basic Building Blocks              11
+## 4521             R Programming            Basic Building Blocks              12
+## 4522             R Programming               Subsetting Vectors              37
+## 4523             R Programming               Subsetting Vectors              27
+## 4524             R Programming                  Dates and Times              38
+## 4525             R Programming                            Logic              51
+## 4526             R Programming                            Logic              53
+## 4527             R Programming                            Logic              54
+## 4528             R Programming                        Functions              47
+## 4529             R Programming                          Vectors              33
+## 4530             R Programming                        Functions              50
+## 4531             R Programming                          Vectors              40
+## 4532             R Programming            Basic Building Blocks               3
+## 4533             R Programming                  Dates and Times               3
+## 4534             R Programming                  Dates and Times               4
+## 4535             R Programming                        Functions              35
+## 4536             R Programming                            Logic              47
+## 4537             R Programming                        Functions              38
+## 4538             R Programming                  Dates and Times              19
+## 4539             R Programming                  Dates and Times              20
+## 4540             R Programming                  Dates and Times              22
+## 4541             R Programming                            Logic              55
+## 4542             R Programming                  Dates and Times              23
+## 4543             R Programming                          Vectors              35
+## 4544             R Programming                        Functions              51
+## 4545             R Programming                  Dates and Times              27
+## 4546             R Programming                   Missing Values              19
+## 4547             R Programming               Subsetting Vectors              26
+## 4548             R Programming                  Dates and Times              32
+## 4549             R Programming                  Dates and Times              17
+## 4550             R Programming                  Dates and Times              37
+## 4551             R Programming                  Dates and Times              18
+## 4552             R Programming            Basic Building Blocks              15
+## 4553             R Programming            Basic Building Blocks              16
+## 4554             R Programming                  Dates and Times              23
+## 4555             R Programming                  Dates and Times              35
+## 4556             R Programming            Basic Building Blocks              10
+## 4557             R Programming                  Dates and Times              27
+## 4558             R Programming                  Dates and Times              30
+## 4559             R Programming                        Functions              36
+## 4560             R Programming                  Dates and Times              17
+## 4561             R Programming                  Dates and Times              29
+## 4562             R Programming            Basic Building Blocks              17
+## 4563             R Programming                        Functions              52
+## 4564             R Programming                  Dates and Times              16
+## 4565             R Programming                  Dates and Times              28
+## 4566             R Programming                  Dates and Times              33
+## 4567             R Programming                  Dates and Times              39
+## 4568             R Programming                            Logic              47
+## 4569             R Programming            Basic Building Blocks              26
+## 4570             R Programming                            Logic              46
+## 4571             R Programming                            Logic              50
+## 4572             R Programming            Basic Building Blocks              25
+## 4573             R Programming                            Logic              51
+## 4574             R Programming                            Logic              49
+## 4575             R Programming                            Logic              44
+## 4576             R Programming              Workspace and Files              17
+## 4577             R Programming                            Logic              55
+## 4578             R Programming              Workspace and Files              21
+## 4579             R Programming              Workspace and Files              17
+## 4580             R Programming              Workspace and Files              11
+## 4581             R Programming              Workspace and Files              14
+## 4582             R Programming                          Vectors              39
+## 4583             R Programming            Basic Building Blocks              27
+## 4584             R Programming                            Logic              42
+## 4585             R Programming                            Logic              43
+## 4586             R Programming              Workspace and Files              19
+## 4587             R Programming                          Vectors              41
+## 4588             R Programming                            Logic              53
+## 4589             R Programming                            Logic              54
+## 4590             R Programming            Basic Building Blocks              33
+## 4591             R Programming                  Dates and Times               3
+## 4592             R Programming                  Dates and Times              39
+## 4593             R Programming              Workspace and Files              10
+## 4594             R Programming                          Vectors              33
+## 4595             R Programming                          Vectors              35
+## 4596             R Programming              Workspace and Files              15
+## 4597             R Programming            Basic Building Blocks              21
+## 4598             R Programming            Basic Building Blocks              22
+## 4599             R Programming                          Vectors              40
+## 4600             R Programming               Subsetting Vectors              32
+## 4601             R Programming                   Missing Values               3
+## 4602             R Programming            Basic Building Blocks              31
+## 4603             R Programming            Basic Building Blocks              12
+## 4604             R Programming            Basic Building Blocks              36
+## 4605             R Programming                  Dates and Times              38
+## 4606             R Programming                  Dates and Times               4
+## 4607             R Programming                  Dates and Times              35
+## 4608             R Programming                          Vectors              33
+## 4609             R Programming            Basic Building Blocks              23
+## 4610             R Programming                  Dates and Times               5
+## 4611             R Programming                  Dates and Times               7
+## 4612             R Programming                            Logic              41
+## 4613             R Programming                  Dates and Times               9
+## 4614             R Programming               Subsetting Vectors              33
+## 4615             R Programming               Subsetting Vectors              34
+## 4616             R Programming                   Missing Values               4
+## 4617             R Programming              Workspace and Files              22
+## 4618             R Programming            Basic Building Blocks              38
+## 4619             R Programming                  Dates and Times              37
+## 4620             R Programming            Basic Building Blocks              39
+## 4621             R Programming                  Dates and Times               4
+## 4622             R Programming              Workspace and Files               9
+## 4623             R Programming            Basic Building Blocks              18
+## 4624             R Programming              Workspace and Files               8
+## 4625             R Programming                  Dates and Times               8
+## 4626             R Programming                            Logic              39
+## 4627             R Programming                  Dates and Times              12
+## 4628             R Programming                  Dates and Times              27
+## 4629             R Programming                  Dates and Times              13
+## 4630             R Programming            Basic Building Blocks              11
+## 4631             R Programming                   Missing Values               6
+## 4632             R Programming              Workspace and Files              22
+## 4633             R Programming                  Dates and Times              33
+## 4634             R Programming                          Vectors              32
+## 4635             R Programming            Basic Building Blocks              17
+## 4636             R Programming            Basic Building Blocks              41
+## 4637             R Programming                            Logic               4
+## 4638             R Programming                            Logic              38
+## 4639             R Programming                            Logic               7
+## 4640             R Programming                            Logic               9
+## 4641             R Programming                  Dates and Times              11
+## 4642             R Programming            Basic Building Blocks               8
+## 4643             R Programming               Subsetting Vectors              36
+## 4644             R Programming               Subsetting Vectors              36
+## 4645             R Programming               Subsetting Vectors              37
+## 4646             R Programming               Subsetting Vectors              38
+## 4647             R Programming               Subsetting Vectors              40
+## 4648             R Programming            Basic Building Blocks              40
+## 4649             R Programming                  Dates and Times              18
+## 4650             R Programming                  Dates and Times              19
+## 4651             R Programming                            Logic               6
+## 4652             R Programming                  Dates and Times              22
+## 4653             R Programming               Subsetting Vectors              31
+## 4654             R Programming              Workspace and Files              29
+## 4655             R Programming              Workspace and Files              31
+## 4656             R Programming            Basic Building Blocks              10
+## 4657             R Programming                  Dates and Times              27
+## 4658             R Programming                            Logic              33
+## 4659             R Programming            Basic Building Blocks              14
+## 4660             R Programming            Basic Building Blocks              15
+## 4661             R Programming            Basic Building Blocks              16
+## 4662             R Programming                          Vectors              30
+## 4663             R Programming              Workspace and Files               6
+## 4664             R Programming                            Logic              37
+## 4665             R Programming               Subsetting Vectors              30
+## 4666             R Programming              Workspace and Files              27
+## 4667             R Programming                          Vectors              18
+## 4668             R Programming                  Dates and Times              24
+## 4669             R Programming                            Logic              10
+## 4670             R Programming                            Logic              12
+## 4671             R Programming                  Dates and Times              14
+## 4672             R Programming               Subsetting Vectors              36
+## 4673             R Programming               Subsetting Vectors              36
+## 4674             R Programming                   Missing Values               6
+## 4675             R Programming                   Missing Values               7
+## 4676             R Programming              Workspace and Files              23
+## 4677             R Programming              Workspace and Files              25
+## 4678             R Programming              Workspace and Files              27
+## 4679             R Programming                          Vectors              17
+## 4680             R Programming                   Missing Values               9
+## 4681             R Programming                   Missing Values              10
+## 4682             R Programming                          Vectors              22
+## 4683             R Programming                          Vectors              22
+## 4684             R Programming                            Logic              32
+## 4685             R Programming                            Logic              15
+## 4686             R Programming                  Dates and Times              15
+## 4687             R Programming                  Dates and Times              16
+## 4688             R Programming                  Dates and Times              16
+## 4689             R Programming                  Dates and Times              17
+## 4690             R Programming                          Vectors               8
+## 4691             R Programming                  Dates and Times              20
+## 4692             R Programming               Subsetting Vectors              42
+## 4693             R Programming               Subsetting Vectors               8
+## 4694             R Programming               Subsetting Vectors               9
+## 4695             R Programming                   Missing Values              12
+## 4696             R Programming                   Missing Values              17
+## 4697             R Programming              Workspace and Files              32
+## 4698             R Programming                  Dates and Times              28
+## 4699             R Programming                  Dates and Times              29
+## 4700             R Programming                  Dates and Times              30
+## 4701             R Programming                  Dates and Times              32
+## 4702             R Programming                            Logic              35
+## 4703             R Programming                            Logic              36
+## 4704             R Programming               Subsetting Vectors              29
+## 4705             R Programming                          Vectors              11
+## 4706             R Programming                   Missing Values               9
+## 4707             R Programming               Subsetting Vectors               5
+## 4708             R Programming                  Dates and Times              23
+## 4709             R Programming            Basic Building Blocks               3
+## 4710             R Programming                            Logic              30
+## 4711             R Programming                            Logic              13
+## 4712             R Programming                            Logic              14
+## 4713             R Programming                            Logic              17
+## 4714             R Programming                            Logic              17
+## 4715             R Programming                            Logic              18
+## 4716             R Programming                            Logic              20
+## 4717             R Programming               Subsetting Vectors              41
+## 4718             R Programming                   Missing Values               8
+## 4719             R Programming                            Logic              23
+## 4720             R Programming                          Vectors               7
+## 4721             R Programming               Subsetting Vectors               3
+## 4722             R Programming                          Vectors              25
+## 4723             R Programming                            Logic              27
+## 4724             R Programming               Subsetting Vectors              15
+## 4725             R Programming                            Logic              32
+## 4726             R Programming                            Logic              21
+## 4727             R Programming                            Logic              33
+## 4728             R Programming                            Logic              33
+## 4729             R Programming                          Vectors              30
+## 4730             R Programming                   Missing Values              23
+## 4731             R Programming                          Vectors               6
+## 4732             R Programming              Workspace and Files              42
+## 4733             R Programming                   Missing Values              22
+## 4734             R Programming              Workspace and Files              33
+## 4735             R Programming              Workspace and Files              34
+## 4736             R Programming              Workspace and Files              34
+## 4737             R Programming                          Vectors              19
+## 4738             R Programming              Workspace and Files              40
+## 4739             R Programming              Workspace and Files               5
+## 4740             R Programming               Subsetting Vectors              27
+## 4741             R Programming              Workspace and Files              35
+## 4742             R Programming               Subsetting Vectors              10
+## 4743             R Programming               Subsetting Vectors              13
+## 4744             R Programming                          Vectors              23
+## 4745             R Programming               Subsetting Vectors              23
+## 4746             R Programming                          Vectors              28
+## 4747             R Programming                          Vectors              29
+## 4748             R Programming                          Vectors               5
+## 4749             R Programming                   Missing Values              18
+## 4750             R Programming                   Missing Values              21
+## 4751             R Programming                   Missing Values              19
+## 4752             R Programming                            Logic              28
+## 4753             R Programming              Workspace and Files              41
+## 4754             R Programming               Subsetting Vectors              14
+## 4755             R Programming               Subsetting Vectors              21
+## 4756             R Programming                   Missing Values              20
+## 4757             R Programming               Subsetting Vectors              11
+## 4758             R Programming               Subsetting Vectors              22
+## 4759             R Programming               Subsetting Vectors              26
+## 4760             R Programming                   Missing Values              20
+## 4761             R Programming               Subsetting Vectors              17
+## 4762 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 4763             R Programming         Matrices and Data Frames               3
+## 4764 Getting and Cleaning Data     Manipulating Data with dplyr              24
+## 4765 Getting and Cleaning Data     Manipulating Data with dplyr              25
+## 4766             R Programming                        Functions              16
+## 4767 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 4768 Getting and Cleaning Data     Manipulating Data with dplyr              26
+## 4769 Getting and Cleaning Data     Manipulating Data with dplyr              26
+## 4770 Getting and Cleaning Data     Manipulating Data with dplyr              49
+## 4771             R Programming         Matrices and Data Frames               3
+## 4772 Getting and Cleaning Data     Manipulating Data with dplyr              23
+## 4773 Getting and Cleaning Data     Manipulating Data with dplyr              22
+## 4774 Getting and Cleaning Data     Manipulating Data with dplyr              26
+## 4775             R Programming                        Functions              35
+## 4776 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 4777 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 4778 Getting and Cleaning Data          Tidying Data with tidyr              28
+## 4779 Getting and Cleaning Data          Tidying Data with tidyr              29
+## 4780 Getting and Cleaning Data     Manipulating Data with dplyr              39
+## 4781 Getting and Cleaning Data          Tidying Data with tidyr              28
+## 4782 Getting and Cleaning Data     Manipulating Data with dplyr              21
+## 4783             R Programming                        Functions              34
+## 4784 Getting and Cleaning Data     Manipulating Data with dplyr              61
+## 4785 Getting and Cleaning Data     Manipulating Data with dplyr              18
+## 4786 Getting and Cleaning Data     Manipulating Data with dplyr              57
+## 4787 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 4788 Getting and Cleaning Data     Manipulating Data with dplyr              62
+## 4789             R Programming                        Functions              32
+## 4790             R Programming                        Functions              35
+## 4791             R Programming         Matrices and Data Frames               4
+## 4792             R Programming         Matrices and Data Frames               5
+## 4793 Getting and Cleaning Data          Tidying Data with tidyr              24
+## 4794 Getting and Cleaning Data     Manipulating Data with dplyr              16
+## 4795 Getting and Cleaning Data     Manipulating Data with dplyr              11
+## 4796             R Programming         Matrices and Data Frames               3
+## 4797 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 4798 Getting and Cleaning Data     Manipulating Data with dplyr              57
+## 4799             R Programming                        Functions              28
+## 4800             R Programming                        Functions              34
+## 4801 Getting and Cleaning Data          Tidying Data with tidyr              21
+## 4802 Getting and Cleaning Data     Manipulating Data with dplyr              37
+## 4803 Getting and Cleaning Data          Tidying Data with tidyr              25
+## 4804 Getting and Cleaning Data     Manipulating Data with dplyr              49
+## 4805             R Programming         Matrices and Data Frames              39
+## 4806 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 4807 Getting and Cleaning Data     Manipulating Data with dplyr               5
+## 4808 Getting and Cleaning Data     Manipulating Data with dplyr              10
+## 4809 Getting and Cleaning Data     Manipulating Data with dplyr              12
+## 4810 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 4811 Getting and Cleaning Data     Manipulating Data with dplyr               8
+## 4812 Getting and Cleaning Data     Manipulating Data with dplyr              34
+## 4813             R Programming                        Functions              27
+## 4814 Getting and Cleaning Data     Manipulating Data with dplyr              36
+## 4815 Getting and Cleaning Data     Manipulating Data with dplyr              46
+## 4816             R Programming         Matrices and Data Frames              18
+## 4817             R Programming         Matrices and Data Frames              21
+## 4818             R Programming                        Functions              35
+## 4819 Getting and Cleaning Data     Manipulating Data with dplyr              50
+## 4820 Getting and Cleaning Data          Tidying Data with tidyr              30
+## 4821 Getting and Cleaning Data          Tidying Data with tidyr              30
+## 4822 Getting and Cleaning Data          Tidying Data with tidyr              32
+## 4823             R Programming                        Functions               9
+## 4824 Getting and Cleaning Data     Manipulating Data with dplyr              33
+## 4825 Getting and Cleaning Data          Tidying Data with tidyr              19
+## 4826 Getting and Cleaning Data     Manipulating Data with dplyr              35
+## 4827             R Programming                        Functions              13
+## 4828 Getting and Cleaning Data     Manipulating Data with dplyr              35
+## 4829 Getting and Cleaning Data     Manipulating Data with dplyr              47
+## 4830 Getting and Cleaning Data     Manipulating Data with dplyr              48
+## 4831 Getting and Cleaning Data     Manipulating Data with dplyr              40
+## 4832             R Programming                        Functions              36
+## 4833 Getting and Cleaning Data     Manipulating Data with dplyr              27
+## 4834 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 4835 Getting and Cleaning Data     Manipulating Data with dplyr               6
+## 4836 Getting and Cleaning Data     Manipulating Data with dplyr               7
+## 4837 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 4838 Getting and Cleaning Data          Tidying Data with tidyr              30
+## 4839 Getting and Cleaning Data          Tidying Data with tidyr              31
+## 4840 Getting and Cleaning Data     Manipulating Data with dplyr              56
+## 4841 Getting and Cleaning Data          Tidying Data with tidyr              20
+## 4842             R Programming         Matrices and Data Frames              17
+## 4843 Getting and Cleaning Data          Tidying Data with tidyr               6
+## 4844             R Programming         Matrices and Data Frames              38
+## 4845             R Programming                        Functions              14
+## 4846             R Programming                        Functions              16
+## 4847             R Programming         Matrices and Data Frames               6
+## 4848             R Programming                        Functions              17
+## 4849 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 4850 Getting and Cleaning Data          Tidying Data with tidyr              30
+## 4851             R Programming         Matrices and Data Frames              10
+## 4852             R Programming         Matrices and Data Frames              12
+## 4853             R Programming         Matrices and Data Frames              13
+## 4854 Getting and Cleaning Data          Tidying Data with tidyr              42
+## 4855             R Programming         Matrices and Data Frames              34
+## 4856             R Programming         Matrices and Data Frames              35
+## 4857 Getting and Cleaning Data          Tidying Data with tidyr               8
+## 4858 Getting and Cleaning Data          Tidying Data with tidyr              11
+## 4859 Getting and Cleaning Data     Manipulating Data with dplyr              63
+## 4860 Getting and Cleaning Data          Tidying Data with tidyr              15
+## 4861 Getting and Cleaning Data     Manipulating Data with dplyr              28
+## 4862 Getting and Cleaning Data          Tidying Data with tidyr              30
+## 4863 Getting and Cleaning Data     Manipulating Data with dplyr              30
+## 4864             R Programming                        Functions               3
+## 4865             R Programming                        Functions               5
+## 4866             R Programming                        Functions              11
+## 4867             R Programming                        Functions               8
+## 4868             R Programming         Matrices and Data Frames              14
+## 4869             R Programming         Matrices and Data Frames              14
+## 4870             R Programming         Matrices and Data Frames              37
+## 4871             R Programming                        Functions              51
+## 4872 Getting and Cleaning Data          Tidying Data with tidyr              12
+## 4873 Getting and Cleaning Data          Tidying Data with tidyr              53
+## 4874 Getting and Cleaning Data     Manipulating Data with dplyr              41
+## 4875             R Programming         Matrices and Data Frames              26
+## 4876 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 4877             R Programming                        Functions              21
+## 4878             R Programming                        Functions              23
+## 4879             R Programming                        Functions              25
+## 4880 Getting and Cleaning Data     Manipulating Data with dplyr              56
+## 4881 Getting and Cleaning Data     Manipulating Data with dplyr              45
+## 4882 Getting and Cleaning Data          Tidying Data with tidyr              58
+## 4883             R Programming         Matrices and Data Frames              16
+## 4884             R Programming         Matrices and Data Frames              16
+## 4885             R Programming                        Functions              52
+## 4886 Getting and Cleaning Data          Tidying Data with tidyr              48
+## 4887             R Programming                        Functions              38
+## 4888 Getting and Cleaning Data     Manipulating Data with dplyr              50
+## 4889             R Programming                        Functions              19
+## 4890             R Programming                        Functions              42
+## 4891 Getting and Cleaning Data          Tidying Data with tidyr              38
+## 4892 Getting and Cleaning Data          Tidying Data with tidyr              39
+## 4893             R Programming         Matrices and Data Frames              30
+## 4894 Getting and Cleaning Data     Manipulating Data with dplyr              44
+## 4895 Getting and Cleaning Data          Tidying Data with tidyr              43
+## 4896             R Programming                        Functions              48
+## 4897             R Programming                        Functions              50
+## 4898 Getting and Cleaning Data          Tidying Data with tidyr              53
+## 4899 Getting and Cleaning Data          Tidying Data with tidyr              47
+## 4900 Getting and Cleaning Data     Manipulating Data with dplyr              40
+## 4901             R Programming         Matrices and Data Frames               7
+## 4902             R Programming         Matrices and Data Frames               9
+## 4903             R Programming         Matrices and Data Frames              27
+## 4904 Getting and Cleaning Data     Manipulating Data with dplyr              41
+## 4905 Getting and Cleaning Data     Manipulating Data with dplyr              44
+## 4906 Getting and Cleaning Data          Tidying Data with tidyr               3
+## 4907             R Programming                        Functions              47
+## 4908             R Programming         Matrices and Data Frames              34
+## 4909 Getting and Cleaning Data          Tidying Data with tidyr              46
+## 4910             R Programming         Matrices and Data Frames              22
+## 4911 Getting and Cleaning Data          Tidying Data with tidyr               6
+## 4912             R Programming                        Functions              42
+## 4913 Getting and Cleaning Data          Tidying Data with tidyr              52
+## 4914 Getting and Cleaning Data     Manipulating Data with dplyr              55
+## 4915             R Programming                        Functions              40
+## 4916 Getting and Cleaning Data     Manipulating Data with dplyr              50
+## 4917 Getting and Cleaning Data     Manipulating Data with dplyr              53
+## 4918             R Programming                        Functions              47
+## 4919             R Programming                        Functions              47
+## 4920 Getting and Cleaning Data          Tidying Data with tidyr              46
+## 4921             R Programming         Matrices and Data Frames              33
+## 4922             R Programming                        Functions              42
+## 4923 Getting and Cleaning Data          Tidying Data with tidyr              53
+## 4924             R Programming                        Functions              47
+## 4925             R Programming                        Functions              41
+## 4926 Getting and Cleaning Data          Tidying Data with tidyr              37
+## 4927 Getting and Cleaning Data          Tidying Data with tidyr              54
+## 4928             R Programming                        Functions              42
+## 4929             R Programming                        Functions              43
+## 4930             R Programming                        Functions              42
+## 4931             R Programming                        Functions              42
+## 4932             R Programming                        Functions              47
+## 4933             R Programming                        Functions              42
+## 4934 Getting and Cleaning Data          Tidying Data with tidyr              57
+## 4935 Getting and Cleaning Data          Tidying Data with tidyr              56
+## 4936 Getting and Cleaning Data          Tidying Data with tidyr              53
+## 4937 Getting and Cleaning Data          Tidying Data with tidyr              34
+## 4938             R Programming         Matrices and Data Frames               7
+## 4939 Getting and Cleaning Data     Manipulating Data with dplyr              16
+## 4940 Getting and Cleaning Data          Tidying Data with tidyr              29
+## 4941 Getting and Cleaning Data     Manipulating Data with dplyr              12
+## 4942 Getting and Cleaning Data          Tidying Data with tidyr              28
+## 4943 Getting and Cleaning Data     Manipulating Data with dplyr              16
+## 4944 Getting and Cleaning Data          Tidying Data with tidyr              30
+## 4945 Getting and Cleaning Data          Tidying Data with tidyr              28
+## 4946             R Programming         Matrices and Data Frames               3
+## 4947             R Programming         Matrices and Data Frames               6
+## 4948 Getting and Cleaning Data     Manipulating Data with dplyr              11
+## 4949 Getting and Cleaning Data     Manipulating Data with dplyr              63
+## 4950 Getting and Cleaning Data     Manipulating Data with dplyr              22
+## 4951 Getting and Cleaning Data     Manipulating Data with dplyr              18
+## 4952             R Programming         Matrices and Data Frames              22
+## 4953 Getting and Cleaning Data     Manipulating Data with dplyr              21
+## 4954 Getting and Cleaning Data Grouping and Chaining with dplyr              32
+## 4955 Getting and Cleaning Data          Tidying Data with tidyr              28
+## 4956 Getting and Cleaning Data     Manipulating Data with dplyr               8
+## 4957 Getting and Cleaning Data     Manipulating Data with dplyr              10
+## 4958             R Programming         Matrices and Data Frames              26
+## 4959 Getting and Cleaning Data Grouping and Chaining with dplyr              33
+## 4960             R Programming         Matrices and Data Frames               4
+## 4961             R Programming         Matrices and Data Frames               5
+## 4962 Getting and Cleaning Data Grouping and Chaining with dplyr              53
+## 4963             R Programming         Matrices and Data Frames              27
+## 4964 Getting and Cleaning Data          Tidying Data with tidyr              30
+## 4965 Getting and Cleaning Data Grouping and Chaining with dplyr              51
+## 4966 Getting and Cleaning Data Grouping and Chaining with dplyr              35
+## 4967 Getting and Cleaning Data Grouping and Chaining with dplyr              54
+## 4968 Getting and Cleaning Data Grouping and Chaining with dplyr              55
+## 4969 Getting and Cleaning Data Grouping and Chaining with dplyr              34
+## 4970             R Programming         Matrices and Data Frames              10
+## 4971 Getting and Cleaning Data          Tidying Data with tidyr              56
+## 4972 Getting and Cleaning Data          Tidying Data with tidyr              57
+## 4973             R Programming         Matrices and Data Frames               9
+## 4974 Getting and Cleaning Data     Manipulating Data with dplyr               7
+## 4975 Getting and Cleaning Data     Manipulating Data with dplyr              61
+## 4976 Getting and Cleaning Data     Manipulating Data with dplyr              62
+## 4977 Getting and Cleaning Data          Tidying Data with tidyr              11
+## 4978 Getting and Cleaning Data          Tidying Data with tidyr              12
+## 4979 Getting and Cleaning Data          Tidying Data with tidyr              15
+## 4980 Getting and Cleaning Data Grouping and Chaining with dplyr              39
+## 4981 Getting and Cleaning Data Grouping and Chaining with dplyr              42
+## 4982 Getting and Cleaning Data Grouping and Chaining with dplyr              43
+## 4983 Getting and Cleaning Data Grouping and Chaining with dplyr              45
+## 4984 Getting and Cleaning Data          Tidying Data with tidyr              31
+## 4985 Getting and Cleaning Data          Tidying Data with tidyr              32
+## 4986 Getting and Cleaning Data     Manipulating Data with dplyr               6
+## 4987 Getting and Cleaning Data          Tidying Data with tidyr              21
+## 4988 Getting and Cleaning Data          Tidying Data with tidyr              24
+## 4989 Getting and Cleaning Data          Tidying Data with tidyr              25
+## 4990 Getting and Cleaning Data          Tidying Data with tidyr              28
+## 4991 Getting and Cleaning Data          Tidying Data with tidyr              28
+## 4992 Getting and Cleaning Data          Tidying Data with tidyr              28
+## 4993 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 4994 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 4995 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 4996 Getting and Cleaning Data          Tidying Data with tidyr              18
+## 4997 Getting and Cleaning Data          Tidying Data with tidyr              19
+## 4998 Getting and Cleaning Data          Tidying Data with tidyr              20
+## 4999 Getting and Cleaning Data          Tidying Data with tidyr              21
+## 5000 Getting and Cleaning Data     Manipulating Data with dplyr              37
+## 5001 Getting and Cleaning Data     Manipulating Data with dplyr              37
+## 5002 Getting and Cleaning Data          Tidying Data with tidyr              33
+## 5003 Getting and Cleaning Data          Tidying Data with tidyr              34
+## 5004 Getting and Cleaning Data          Tidying Data with tidyr              37
+## 5005 Getting and Cleaning Data          Tidying Data with tidyr              38
+## 5006 Getting and Cleaning Data          Tidying Data with tidyr              28
+## 5007 Getting and Cleaning Data     Manipulating Data with dplyr              30
+## 5008 Getting and Cleaning Data     Manipulating Data with dplyr              33
+## 5009 Getting and Cleaning Data     Manipulating Data with dplyr              34
+## 5010 Getting and Cleaning Data     Manipulating Data with dplyr              35
+## 5011 Getting and Cleaning Data     Manipulating Data with dplyr              36
+## 5012 Getting and Cleaning Data     Manipulating Data with dplyr              37
+## 5013 Getting and Cleaning Data     Manipulating Data with dplyr               4
+## 5014 Getting and Cleaning Data          Tidying Data with tidyr               3
+## 5015 Getting and Cleaning Data          Tidying Data with tidyr               6
+## 5016 Getting and Cleaning Data          Tidying Data with tidyr               8
+## 5017 Getting and Cleaning Data          Tidying Data with tidyr              53
+## 5018 Getting and Cleaning Data          Tidying Data with tidyr              53
+## 5019 Getting and Cleaning Data          Tidying Data with tidyr              53
+## 5020 Getting and Cleaning Data          Tidying Data with tidyr              53
+## 5021 Getting and Cleaning Data          Tidying Data with tidyr              54
+## 5022 Getting and Cleaning Data Grouping and Chaining with dplyr              17
+## 5023 Getting and Cleaning Data Grouping and Chaining with dplyr              21
+## 5024 Getting and Cleaning Data Grouping and Chaining with dplyr              22
+## 5025 Getting and Cleaning Data          Tidying Data with tidyr              58
+## 5026             R Programming         Matrices and Data Frames              12
+## 5027             R Programming         Matrices and Data Frames              13
+## 5028             R Programming         Matrices and Data Frames              14
+## 5029             R Programming         Matrices and Data Frames              16
+## 5030             R Programming         Matrices and Data Frames              17
+## 5031             R Programming         Matrices and Data Frames              17
+## 5032             R Programming         Matrices and Data Frames              17
+## 5033             R Programming         Matrices and Data Frames              18
+## 5034             R Programming         Matrices and Data Frames              21
+## 5035             R Programming                  Looking at Data               3
+## 5036             R Programming                  Looking at Data               3
+## 5037             R Programming                  Looking at Data               3
+## 5038             R Programming         Matrices and Data Frames              30
+## 5039             R Programming         Matrices and Data Frames              33
+## 5040             R Programming         Matrices and Data Frames              34
+## 5041             R Programming         Matrices and Data Frames              34
+## 5042             R Programming         Matrices and Data Frames              35
+## 5043             R Programming         Matrices and Data Frames              37
+## 5044             R Programming         Matrices and Data Frames              38
+## 5045             R Programming         Matrices and Data Frames              39
+## 5046 Getting and Cleaning Data          Tidying Data with tidyr              39
+## 5047 Getting and Cleaning Data          Tidying Data with tidyr              39
+## 5048 Getting and Cleaning Data          Tidying Data with tidyr              39
+## 5049 Getting and Cleaning Data          Tidying Data with tidyr              42
+## 5050 Getting and Cleaning Data          Tidying Data with tidyr              43
+## 5051 Getting and Cleaning Data          Tidying Data with tidyr              46
+## 5052 Getting and Cleaning Data          Tidying Data with tidyr              46
+## 5053 Getting and Cleaning Data          Tidying Data with tidyr              47
+## 5054 Getting and Cleaning Data          Tidying Data with tidyr              48
+## 5055 Getting and Cleaning Data          Tidying Data with tidyr              52
+## 5056 Getting and Cleaning Data          Tidying Data with tidyr              53
+## 5057 Getting and Cleaning Data Grouping and Chaining with dplyr               9
+## 5058 Getting and Cleaning Data Grouping and Chaining with dplyr              10
+## 5059 Getting and Cleaning Data Grouping and Chaining with dplyr              11
+## 5060 Getting and Cleaning Data Grouping and Chaining with dplyr              14
+## 5061 Getting and Cleaning Data Grouping and Chaining with dplyr              16
+## 5062 Exploratory_Data_Analysis                 Plotting_Systems              35
+## 5063 Exploratory_Data_Analysis                 Plotting_Systems              36
+## 5064 Exploratory_Data_Analysis                 Plotting_Systems              38
+## 5065 Getting and Cleaning Data Grouping and Chaining with dplyr              22
+## 5066 Getting and Cleaning Data Grouping and Chaining with dplyr              23
+## 5067 Getting and Cleaning Data Grouping and Chaining with dplyr              25
+## 5068 Getting and Cleaning Data Grouping and Chaining with dplyr              26
+## 5069 Getting and Cleaning Data Grouping and Chaining with dplyr              27
+## 5070 Getting and Cleaning Data Grouping and Chaining with dplyr              31
+## 5071 Getting and Cleaning Data     Manipulating Data with dplyr              25
+## 5072 Getting and Cleaning Data     Manipulating Data with dplyr              26
+## 5073 Getting and Cleaning Data     Manipulating Data with dplyr              27
+## 5074 Getting and Cleaning Data     Manipulating Data with dplyr              28
+## 5075 Exploratory_Data_Analysis                 Plotting_Systems              16
+## 5076 Exploratory_Data_Analysis                 Plotting_Systems              17
+## 5077 Exploratory_Data_Analysis                 Plotting_Systems              19
+## 5078 Exploratory_Data_Analysis                 Plotting_Systems              19
+## 5079             R Programming                  Looking at Data               4
+## 5080 Getting and Cleaning Data Grouping and Chaining with dplyr              48
+## 5081 Getting and Cleaning Data Grouping and Chaining with dplyr              49
+## 5082 Getting and Cleaning Data Grouping and Chaining with dplyr              50
+## 5083 Exploratory_Data_Analysis                 Plotting_Systems               5
+## 5084 Exploratory_Data_Analysis                 Plotting_Systems               5
+## 5085 Exploratory_Data_Analysis                 Plotting_Systems               7
+## 5086 Exploratory_Data_Analysis                 Plotting_Systems               9
+## 5087 Exploratory_Data_Analysis                 Plotting_Systems              11
+## 5088 Exploratory_Data_Analysis                 Plotting_Systems              34
+## 5089 Getting and Cleaning Data     Manipulating Data with dplyr              46
+## 5090 Getting and Cleaning Data     Manipulating Data with dplyr              47
+## 5091 Getting and Cleaning Data     Manipulating Data with dplyr              48
+## 5092 Exploratory_Data_Analysis                 Plotting_Systems              20
+## 5093 Exploratory_Data_Analysis                 Plotting_Systems              21
+## 5094 Exploratory_Data_Analysis                 Plotting_Systems              25
+## 5095 Getting and Cleaning Data     Manipulating Data with dplyr               5
+## 5096 Exploratory_Data_Analysis                 Plotting_Systems              28
+## 5097 Exploratory_Data_Analysis                 Plotting_Systems              31
+## 5098 Exploratory_Data_Analysis                 Plotting_Systems              32
+## 5099 Exploratory_Data_Analysis                 Plotting_Systems              33
+## 5100 Exploratory_Data_Analysis                 Plotting_Systems              34
+## 5101 Getting and Cleaning Data     Manipulating Data with dplyr              45
+## 5102             R Programming                  Looking at Data              16
+## 5103             R Programming                  Looking at Data              17
+## 5104             R Programming                  Looking at Data              20
+## 5105 Exploratory_Data_Analysis                 Plotting_Systems              39
+## 5106 Exploratory_Data_Analysis                 Plotting_Systems              40
+## 5107 Getting and Cleaning Data     Manipulating Data with dplyr              23
+## 5108 Getting and Cleaning Data     Manipulating Data with dplyr              23
+## 5109 Getting and Cleaning Data     Manipulating Data with dplyr              23
+## 5110 Getting and Cleaning Data     Manipulating Data with dplyr              24
+## 5111 Getting and Cleaning Data     Manipulating Data with dplyr              40
+## 5112 Getting and Cleaning Data     Manipulating Data with dplyr              41
+## 5113 Getting and Cleaning Data     Manipulating Data with dplyr              44
+## 5114             R Programming                  Looking at Data              15
+## 5115 Getting and Cleaning Data     Manipulating Data with dplyr              50
+## 5116             R Programming                  Looking at Data               6
+## 5117             R Programming                  Looking at Data               8
+## 5118 Getting and Cleaning Data     Manipulating Data with dplyr              49
+## 5119 Getting and Cleaning Data     Manipulating Data with dplyr              39
+## 5120 Getting and Cleaning Data     Manipulating Data with dplyr              57
+## 5121 Getting and Cleaning Data Grouping and Chaining with dplyr               9
+## 5122             R Programming                  Looking at Data               9
+## 5123             R Programming                  Looking at Data              22
+## 5124             R Programming                  Looking at Data              26
+## 5125 Getting and Cleaning Data     Manipulating Data with dplyr              53
+## 5126             R Programming                  Looking at Data              13
+## 5127 Getting and Cleaning Data     Manipulating Data with dplyr              56
+## 5128 Getting and Cleaning Data     Manipulating Data with dplyr              56
+## 5129             R Programming                  Looking at Data              10
+## 5130 Getting and Cleaning Data     Manipulating Data with dplyr              55
+## 5131 Exploratory_Data_Analysis                 Plotting_Systems              27
+## 5132 Getting and Cleaning Data Grouping and Chaining with dplyr               5
+## 5133 Getting and Cleaning Data Grouping and Chaining with dplyr               6
+## 5134             R Programming                  Looking at Data              11
+## 5135             R Programming                  Looking at Data              28
+## 5136 Exploratory_Data_Analysis                 Plotting_Systems              26
+## 5137             R Programming                  Looking at Data              27
+## 5138 Getting and Cleaning Data Grouping and Chaining with dplyr               8
+## 5139 Getting and Cleaning Data Grouping and Chaining with dplyr               7
+## 5140             R Programming                        Functions               3
+## 5141             R Programming                        Functions              50
+## 5142             R Programming                            Logic               4
+## 5143             R Programming                            Logic               7
+## 5144             R Programming                        Functions              48
+## 5145             R Programming                        Functions               8
+## 5146             R Programming                        Functions              47
+## 5147             R Programming               Subsetting Vectors              10
+## 5148             R Programming                            Logic               6
+## 5149             R Programming                        Functions               5
+## 5150             R Programming               Subsetting Vectors               9
+## 5151             R Programming               Subsetting Vectors              13
+## 5152             R Programming                        Functions               8
+## 5153             R Programming               Subsetting Vectors               5
+## 5154             R Programming                        Functions               9
+## 5155             R Programming               Subsetting Vectors               8
+## 5156             R Programming                        Functions              42
+## 5157             R Programming               Subsetting Vectors              10
+## 5158             R Programming              Workspace and Files              40
+## 5159             R Programming               Subsetting Vectors              11
+## 5160             R Programming                          Vectors              19
+## 5161             R Programming               Subsetting Vectors               3
+## 5162             R Programming                          Vectors              17
+## 5163             R Programming                        Functions              40
+## 5164             R Programming                        Functions              41
+## 5165             R Programming                        Functions              42
+## 5166             R Programming            Basic Building Blocks              22
+## 5167             R Programming            Basic Building Blocks              41
+## 5168             R Programming                          Vectors              18
+## 5169             R Programming                        Functions              42
+## 5170             R Programming                   Missing Values              10
+## 5171             R Programming               Subsetting Vectors              14
+## 5172             R Programming               Subsetting Vectors              21
+## 5173             R Programming                        Functions              42
+## 5174             R Programming               Subsetting Vectors              14
+## 5175             R Programming                   Missing Values              23
+## 5176             R Programming                          Vectors              11
+## 5177             R Programming               Subsetting Vectors              22
+## 5178             R Programming               Subsetting Vectors              23
+## 5179             R Programming            Basic Building Blocks              40
+## 5180             R Programming                        Functions              43
+## 5181             R Programming                        Functions              42
+## 5182             R Programming              Workspace and Files              29
+## 5183             R Programming                        Functions              43
+## 5184             R Programming               Subsetting Vectors              21
+## 5185             R Programming              Workspace and Files              35
+## 5186             R Programming                          Vectors              28
+## 5187             R Programming                          Vectors              28
+## 5188             R Programming                          Vectors              29
+## 5189             R Programming                          Vectors              30
+## 5190             R Programming              Workspace and Files              27
+## 5191             R Programming                          Vectors              33
+## 5192             R Programming              Workspace and Files              31
+## 5193             R Programming              Workspace and Files              31
+## 5194             R Programming               Subsetting Vectors              15
+## 5195             R Programming                        Functions              13
+## 5196             R Programming               Subsetting Vectors              17
+## 5197             R Programming              Workspace and Files              34
+## 5198             R Programming                        Functions              40
+## 5199             R Programming            Basic Building Blocks              36
+## 5200             R Programming            Basic Building Blocks              38
+## 5201             R Programming            Basic Building Blocks              39
+## 5202             R Programming                            Logic              54
+## 5203             R Programming                            Logic              55
+## 5204             R Programming              Workspace and Files               5
+## 5205             R Programming              Workspace and Files               6
+## 5206             R Programming              Workspace and Files               8
+## 5207             R Programming                        Functions              11
+## 5208             R Programming                   Missing Values              20
+## 5209             R Programming              Workspace and Files              14
+## 5210             R Programming              Workspace and Files              15
+## 5211             R Programming                        Functions              51
+## 5212             R Programming                        Functions              52
+## 5213             R Programming              Workspace and Files              19
+## 5214             R Programming                          Vectors               5
+## 5215             R Programming                          Vectors               5
+## 5216             R Programming                          Vectors               6
+## 5217             R Programming                          Vectors               7
+## 5218             R Programming                          Vectors               8
+## 5219             R Programming                  Dates and Times              23
+## 5220             R Programming              Workspace and Files               9
+## 5221             R Programming              Workspace and Files              11
+## 5222             R Programming              Workspace and Files              33
+## 5223             R Programming              Workspace and Files              34
+## 5224             R Programming            Basic Building Blocks              18
+## 5225             R Programming            Basic Building Blocks              21
+## 5226             R Programming                   Missing Values               6
+## 5227             R Programming                   Missing Values               7
+## 5228             R Programming                   Missing Values               8
+## 5229             R Programming                   Missing Values               9
+## 5230             R Programming                        Functions              28
+## 5231             R Programming                   Missing Values              12
+## 5232             R Programming                   Missing Values              17
+## 5233             R Programming                  Dates and Times              24
+## 5234             R Programming              Workspace and Files              32
+## 5235             R Programming                   Missing Values              20
+## 5236             R Programming                   Missing Values              21
+## 5237             R Programming                   Missing Values              22
+## 5238             R Programming                          Vectors              41
+## 5239             R Programming                            Logic              50
+## 5240             R Programming                            Logic              51
+## 5241             R Programming                            Logic              53
+## 5242             R Programming              Workspace and Files              22
+## 5243             R Programming              Workspace and Files              22
+## 5244             R Programming                  Dates and Times               3
+## 5245             R Programming                  Dates and Times               4
+## 5246             R Programming                  Dates and Times               5
+## 5247             R Programming                  Dates and Times               7
+## 5248             R Programming              Workspace and Files              10
+## 5249             R Programming                  Dates and Times              11
+## 5250             R Programming                            Logic               9
+## 5251             R Programming                        Functions              13
+## 5252             R Programming                        Functions              13
+## 5253             R Programming                        Functions              13
+## 5254             R Programming              Workspace and Files              21
+## 5255             R Programming              Workspace and Files              41
+## 5256             R Programming              Workspace and Files              42
+## 5257             R Programming              Workspace and Files              23
+## 5258             R Programming              Workspace and Files              25
+## 5259             R Programming            Basic Building Blocks              11
+## 5260             R Programming            Basic Building Blocks              12
+## 5261             R Programming                  Dates and Times              27
+## 5262             R Programming                  Dates and Times              27
+## 5263             R Programming                  Dates and Times              27
+## 5264             R Programming                  Dates and Times              27
+## 5265             R Programming                  Dates and Times              28
+## 5266             R Programming                  Dates and Times              29
+## 5267             R Programming                  Dates and Times              30
+## 5268             R Programming                        Functions              13
+## 5269             R Programming                        Functions              13
+## 5270             R Programming                  Dates and Times              37
+## 5271             R Programming                  Dates and Times              38
+## 5272             R Programming                  Dates and Times              39
+## 5273             R Programming                   Missing Values              18
+## 5274             R Programming                   Missing Values              19
+## 5275             R Programming                          Vectors              35
+## 5276             R Programming                        Functions              36
+## 5277             R Programming                        Functions              38
+## 5278             R Programming            Basic Building Blocks              33
+## 5279             R Programming                            Logic              49
+## 5280             R Programming              Workspace and Files              17
+## 5281             R Programming                            Logic              37
+## 5282             R Programming                            Logic              38
+## 5283             R Programming            Basic Building Blocks               3
+## 5284             R Programming            Basic Building Blocks               8
+## 5285             R Programming            Basic Building Blocks              10
+## 5286             R Programming               Subsetting Vectors              27
+## 5287             R Programming               Subsetting Vectors              29
+## 5288             R Programming                  Dates and Times               8
+## 5289             R Programming                  Dates and Times               9
+## 5290             R Programming                  Dates and Times              12
+## 5291             R Programming                  Dates and Times              13
+## 5292             R Programming              Workspace and Files              17
+## 5293             R Programming                          Vectors              28
+## 5294             R Programming                            Logic              12
+## 5295             R Programming                  Dates and Times              16
+## 5296             R Programming            Basic Building Blocks              22
+## 5297             R Programming            Basic Building Blocks              22
+## 5298             R Programming                          Vectors              32
+## 5299             R Programming            Basic Building Blocks              22
+## 5300             R Programming            Basic Building Blocks              23
+## 5301             R Programming            Basic Building Blocks              14
+## 5302             R Programming            Basic Building Blocks              15
+## 5303             R Programming                          Vectors              22
+## 5304             R Programming                          Vectors              23
+## 5305             R Programming                          Vectors              25
+## 5306             R Programming                            Logic              10
+## 5307             R Programming                            Logic              36
+## 5308             R Programming               Subsetting Vectors              36
+## 5309             R Programming                  Dates and Times              16
+## 5310             R Programming                  Dates and Times              17
+## 5311             R Programming                  Dates and Times              18
+## 5312             R Programming               Subsetting Vectors              26
+## 5313             R Programming                        Functions              13
+## 5314             R Programming                          Vectors              33
+## 5315             R Programming            Basic Building Blocks              26
+## 5316             R Programming                          Vectors              39
+## 5317             R Programming                          Vectors              40
+## 5318             R Programming                        Functions              35
+## 5319             R Programming            Basic Building Blocks              17
+## 5320             R Programming               Subsetting Vectors              33
+## 5321             R Programming                  Dates and Times              14
+## 5322             R Programming               Subsetting Vectors              37
+## 5323             R Programming                  Dates and Times              32
+## 5324             R Programming                  Dates and Times              33
+## 5325             R Programming            Basic Building Blocks              22
+## 5326             R Programming               Subsetting Vectors              42
+## 5327             R Programming                        Functions              13
+## 5328             R Programming               Subsetting Vectors              30
+## 5329             R Programming               Subsetting Vectors              31
+## 5330             R Programming            Basic Building Blocks              16
+## 5331             R Programming            Basic Building Blocks              17
+## 5332             R Programming                            Logic              47
+## 5333             R Programming                        Functions              13
+## 5334             R Programming               Subsetting Vectors              34
+## 5335             R Programming                            Logic              13
+## 5336             R Programming                            Logic              14
+## 5337             R Programming                            Logic              15
+## 5338             R Programming                            Logic              17
+## 5339             R Programming                            Logic              18
+## 5340             R Programming                        Functions              27
+## 5341             R Programming            Basic Building Blocks              25
+## 5342             R Programming                        Functions              32
+## 5343             R Programming            Basic Building Blocks              27
+## 5344             R Programming            Basic Building Blocks              31
+## 5345             R Programming               Subsetting Vectors              32
+## 5346             R Programming                            Logic              46
+## 5347             R Programming                        Functions              14
+## 5348             R Programming                   Missing Values               3
+## 5349             R Programming                   Missing Values               4
+## 5350             R Programming                        Functions              19
+## 5351             R Programming                        Functions              21
+## 5352             R Programming                  Dates and Times              35
+## 5353             R Programming                  Dates and Times              19
+## 5354             R Programming                  Dates and Times              20
+## 5355             R Programming                        Functions              13
+## 5356             R Programming                        Functions              13
+## 5357             R Programming               Subsetting Vectors              32
+## 5358             R Programming                        Functions              35
+## 5359             R Programming                            Logic              27
+## 5360             R Programming                            Logic              28
+## 5361             R Programming                        Functions              16
+## 5362             R Programming                  Dates and Times              15
+## 5363             R Programming                        Functions              16
+## 5364             R Programming                        Functions              17
+## 5365             R Programming               Subsetting Vectors              38
+## 5366             R Programming                        Functions              25
+## 5367             R Programming                            Logic              41
+## 5368             R Programming                            Logic              43
+## 5369             R Programming                  Dates and Times              22
+## 5370             R Programming                        Functions              34
+## 5371             R Programming                        Functions              13
+## 5372             R Programming               Subsetting Vectors              41
+## 5373             R Programming                            Logic              20
+## 5374             R Programming                            Logic              30
+## 5375             R Programming                            Logic              33
+## 5376             R Programming                            Logic              44
+## 5377             R Programming               Subsetting Vectors              40
+## 5378             R Programming                            Logic              35
+## 5379             R Programming                        Functions              23
+## 5380             R Programming                            Logic              32
+## 5381             R Programming                            Logic              23
+## 5382             R Programming                            Logic              42
+## 5383             R Programming                  Dates and Times              23
+## 5384             R Programming                            Logic              21
+## 5385             R Programming                            Logic              39
+## 5386             R Programming            Basic Building Blocks               3
+## 5387             R Programming            Basic Building Blocks               8
+## 5388             R Programming            Basic Building Blocks              41
+## 5389             R Programming            Basic Building Blocks              23
+## 5390             R Programming            Basic Building Blocks              40
+## 5391             R Programming            Basic Building Blocks              10
+## 5392             R Programming            Basic Building Blocks              11
+## 5393             R Programming            Basic Building Blocks              25
+## 5394             R Programming            Basic Building Blocks              26
+## 5395             R Programming            Basic Building Blocks              15
+## 5396             R Programming            Basic Building Blocks              16
+## 5397             R Programming            Basic Building Blocks              17
+## 5398             R Programming            Basic Building Blocks              18
+## 5399             R Programming            Basic Building Blocks              21
+## 5400             R Programming            Basic Building Blocks              22
+## 5401             R Programming            Basic Building Blocks              31
+## 5402             R Programming            Basic Building Blocks              12
+## 5403             R Programming            Basic Building Blocks              14
+## 5404             R Programming            Basic Building Blocks              27
+## 5405             R Programming            Basic Building Blocks              33
+## 5406             R Programming            Basic Building Blocks              36
+## 5407             R Programming            Basic Building Blocks              38
+## 5408             R Programming            Basic Building Blocks              31
+## 5409             R Programming            Basic Building Blocks              39
+## 5410             R Programming              Workspace and Files              40
+## 5411             R Programming                            Logic              41
+## 5412             R Programming              Workspace and Files              34
+## 5413             R Programming              Workspace and Files              32
+## 5414             R Programming              Workspace and Files              32
+## 5415             R Programming              Workspace and Files              33
+## 5416             R Programming              Workspace and Files              35
+## 5417             R Programming                            Logic              38
+## 5418             R Programming                            Logic              38
+## 5419             R Programming                            Logic              38
+## 5420             R Programming              Workspace and Files              34
+## 5421             R Programming                            Logic              41
+## 5422             R Programming                        Functions               9
+## 5423             R Programming                            Logic              42
+## 5424             R Programming                            Logic              39
+## 5425             R Programming              Workspace and Files              31
+## 5426             R Programming              Workspace and Files              11
+## 5427             R Programming              Workspace and Files              14
+## 5428             R Programming              Workspace and Files              15
+## 5429             R Programming              Workspace and Files              15
+## 5430             R Programming              Workspace and Files              17
+## 5431             R Programming              Workspace and Files              19
+## 5432             R Programming              Workspace and Files              21
+## 5433             R Programming              Workspace and Files              22
+## 5434             R Programming              Workspace and Files              22
+## 5435             R Programming              Workspace and Files              23
+## 5436             R Programming              Workspace and Files              25
+## 5437             R Programming              Workspace and Files              27
+## 5438             R Programming              Workspace and Files              29
+## 5439             R Programming                        Functions              27
+## 5440             R Programming                        Functions              27
+## 5441             R Programming                        Functions              28
+## 5442             R Programming                        Functions              28
+## 5443             R Programming                        Functions              32
+## 5444             R Programming                        Functions              34
+## 5445             R Programming                        Functions              34
+## 5446             R Programming                        Functions              34
+## 5447             R Programming                        Functions              34
+## 5448             R Programming              Workspace and Files              41
+## 5449             R Programming              Workspace and Files              42
+## 5450             R Programming                  Dates and Times              12
+## 5451             R Programming                  Dates and Times              13
+## 5452             R Programming                  Dates and Times              14
+## 5453             R Programming                  Dates and Times              15
+## 5454             R Programming                  Dates and Times              16
+## 5455             R Programming                  Dates and Times              16
+## 5456             R Programming                  Dates and Times              17
+## 5457             R Programming                  Dates and Times              18
+## 5458             R Programming                  Dates and Times              19
+## 5459             R Programming                  Dates and Times              20
+## 5460             R Programming                  Dates and Times              22
+## 5461             R Programming                  Dates and Times              23
+## 5462             R Programming                  Dates and Times              24
+## 5463             R Programming                        Functions              11
+## 5464             R Programming                        Functions              13
+## 5465             R Programming                        Functions              13
+## 5466             R Programming                        Functions              14
+## 5467             R Programming                        Functions              16
+## 5468             R Programming                        Functions              17
+## 5469             R Programming                        Functions              19
+## 5470             R Programming                        Functions              21
+## 5471             R Programming                        Functions              23
+## 5472             R Programming                        Functions              25
+## 5473             R Programming                        Functions              27
+## 5474             R Programming                        Functions              27
+## 5475             R Programming                        Functions              27
+## 5476             R Programming                        Functions              27
+## 5477             R Programming                        Functions              27
+## 5478             R Programming                        Functions              27
+## 5479             R Programming                            Logic              30
+## 5480             R Programming                            Logic              32
+## 5481             R Programming                            Logic              33
+## 5482             R Programming                            Logic              35
+## 5483             R Programming                            Logic              36
+## 5484             R Programming                            Logic              37
+## 5485             R Programming               Subsetting Vectors              27
+## 5486             R Programming               Subsetting Vectors              29
+## 5487             R Programming               Subsetting Vectors              30
+## 5488             R Programming               Subsetting Vectors              30
+## 5489             R Programming               Subsetting Vectors              31
+## 5490             R Programming               Subsetting Vectors              32
+## 5491             R Programming               Subsetting Vectors              33
+## 5492             R Programming                            Logic              43
+## 5493             R Programming                            Logic              44
+## 5494             R Programming                            Logic              46
+## 5495             R Programming                            Logic              47
+## 5496             R Programming                            Logic              49
+## 5497             R Programming                            Logic              49
+## 5498             R Programming                            Logic              50
+## 5499             R Programming                            Logic              51
+## 5500             R Programming                            Logic              53
+## 5501             R Programming                            Logic              54
+## 5502             R Programming                   Missing Values              19
+## 5503             R Programming                   Missing Values              20
+## 5504             R Programming                   Missing Values              21
+## 5505             R Programming                   Missing Values              22
+## 5506             R Programming                   Missing Values              23
+## 5507             R Programming               Subsetting Vectors               3
+## 5508             R Programming               Subsetting Vectors               5
+## 5509             R Programming               Subsetting Vectors               8
+## 5510             R Programming               Subsetting Vectors               9
+## 5511             R Programming               Subsetting Vectors              10
+## 5512             R Programming               Subsetting Vectors              11
+## 5513             R Programming               Subsetting Vectors              13
+## 5514             R Programming               Subsetting Vectors              14
+## 5515             R Programming               Subsetting Vectors              15
+## 5516             R Programming               Subsetting Vectors              17
+## 5517             R Programming               Subsetting Vectors              21
+## 5518             R Programming               Subsetting Vectors              21
+## 5519             R Programming               Subsetting Vectors              21
+## 5520             R Programming               Subsetting Vectors              21
+## 5521             R Programming               Subsetting Vectors              22
+## 5522             R Programming               Subsetting Vectors              23
+## 5523             R Programming               Subsetting Vectors              23
+## 5524             R Programming               Subsetting Vectors              26
+## 5525             R Programming                          Vectors              33
+## 5526             R Programming                          Vectors              33
+## 5527             R Programming                          Vectors              33
+## 5528             R Programming                          Vectors              33
+## 5529             R Programming                          Vectors              35
+## 5530             R Programming                          Vectors              39
+## 5531             R Programming                          Vectors              40
+## 5532             R Programming               Subsetting Vectors              34
+## 5533             R Programming               Subsetting Vectors              34
+## 5534             R Programming               Subsetting Vectors              36
+## 5535             R Programming               Subsetting Vectors              37
+## 5536             R Programming               Subsetting Vectors              37
+## 5537             R Programming               Subsetting Vectors              38
+## 5538             R Programming               Subsetting Vectors              40
+## 5539             R Programming               Subsetting Vectors              41
+## 5540             R Programming               Subsetting Vectors              42
+## 5541             R Programming                            Logic               4
+## 5542             R Programming                            Logic               6
+## 5543             R Programming                            Logic               6
+## 5544             R Programming                            Logic               7
+## 5545             R Programming                            Logic               9
+## 5546             R Programming                            Logic              10
+## 5547             R Programming                            Logic              12
+## 5548             R Programming                            Logic              13
+## 5549             R Programming                            Logic              14
+## 5550             R Programming                            Logic              15
+## 5551             R Programming                            Logic              15
+## 5552             R Programming                            Logic              15
+## 5553             R Programming                            Logic              17
+## 5554             R Programming                            Logic              18
+## 5555             R Programming                            Logic              20
+## 5556             R Programming                            Logic              21
+## 5557             R Programming                            Logic              23
+## 5558             R Programming                            Logic              27
+## 5559             R Programming                            Logic              28
+## 5560             R Programming                          Vectors              30
+## 5561             R Programming                          Vectors              30
+## 5562             R Programming                          Vectors              30
+## 5563             R Programming                          Vectors              32
+## 5564             R Programming                          Vectors              32
+## 5565             R Programming                  Dates and Times               3
+## 5566             R Programming                  Dates and Times               4
+## 5567             R Programming                  Dates and Times               5
+## 5568             R Programming                  Dates and Times               7
+## 5569             R Programming                  Dates and Times               8
+## 5570             R Programming                  Dates and Times               9
+## 5571             R Programming                  Dates and Times               9
+## 5572             R Programming                          Vectors              41
+## 5573             R Programming                   Missing Values               3
+## 5574             R Programming                   Missing Values               4
+## 5575             R Programming                   Missing Values               6
+## 5576             R Programming                   Missing Values               7
+## 5577             R Programming                   Missing Values               8
+## 5578             R Programming                   Missing Values               9
+## 5579             R Programming                   Missing Values              10
+## 5580             R Programming                   Missing Values              12
+## 5581             R Programming                   Missing Values              17
+## 5582             R Programming                   Missing Values              18
+## 5583             R Programming              Workspace and Files               5
+## 5584             R Programming                          Vectors               5
+## 5585             R Programming                          Vectors               6
+## 5586             R Programming                          Vectors               7
+## 5587             R Programming                          Vectors               8
+## 5588             R Programming                          Vectors              11
+## 5589             R Programming                          Vectors              17
+## 5590             R Programming                          Vectors              18
+## 5591             R Programming                          Vectors              19
+## 5592             R Programming                          Vectors              22
+## 5593             R Programming                          Vectors              22
+## 5594             R Programming                          Vectors              23
+## 5595             R Programming                          Vectors              25
+## 5596             R Programming                          Vectors              28
+## 5597             R Programming                          Vectors              28
+## 5598             R Programming                          Vectors              29
+## 5599             R Programming                          Vectors              30
+## 5600             R Programming              Workspace and Files              25
+## 5601             R Programming              Workspace and Files              27
+## 5602             R Programming              Workspace and Files              29
+## 5603             R Programming              Workspace and Files              31
+## 5604             R Programming              Workspace and Files              31
+## 5605             R Programming            Basic Building Blocks              10
+## 5606             R Programming            Basic Building Blocks              11
+## 5607             R Programming            Basic Building Blocks              12
+## 5608             R Programming            Basic Building Blocks              14
+## 5609             R Programming            Basic Building Blocks              15
+## 5610             R Programming            Basic Building Blocks              16
+## 5611             R Programming            Basic Building Blocks              17
+## 5612             R Programming                  Dates and Times              11
+## 5613             R Programming                  Dates and Times              11
+## 5614             R Programming                        Functions              35
+## 5615             R Programming                        Functions              35
+## 5616             R Programming                        Functions              36
+## 5617             R Programming                        Functions              36
+## 5618             R Programming                        Functions              38
+## 5619             R Programming                        Functions              40
+## 5620             R Programming                        Functions              40
+## 5621             R Programming                        Functions              41
+## 5622             R Programming                        Functions              42
+## 5623             R Programming                        Functions              42
+## 5624             R Programming              Workspace and Files               6
+## 5625             R Programming              Workspace and Files               8
+## 5626             R Programming              Workspace and Files               9
+## 5627             R Programming              Workspace and Files              10
+## 5628             R Programming              Workspace and Files              11
+## 5629             R Programming              Workspace and Files              11
+## 5630             R Programming              Workspace and Files              11
+## 5631             R Programming              Workspace and Files              11
+## 5632             R Programming              Workspace and Files              14
+## 5633             R Programming              Workspace and Files              15
+## 5634             R Programming              Workspace and Files              17
+## 5635             R Programming              Workspace and Files              19
+## 5636             R Programming              Workspace and Files              21
+## 5637             R Programming              Workspace and Files              22
+## 5638             R Programming              Workspace and Files              23
+## 5639             R Programming              Workspace and Files              23
+## 5640             R Programming            Basic Building Blocks              21
+## 5641             R Programming            Basic Building Blocks              22
+## 5642             R Programming            Basic Building Blocks              23
+## 5643             R Programming            Basic Building Blocks               3
+## 5644             R Programming            Basic Building Blocks               8
+## 5645             R Programming            Basic Building Blocks              27
+## 5646             R Programming              Workspace and Files              32
+## 5647             R Programming              Workspace and Files              33
+## 5648             R Programming              Workspace and Files              34
+## 5649             R Programming              Workspace and Files              34
+## 5650             R Programming              Workspace and Files              35
+## 5651             R Programming              Workspace and Files              35
+## 5652             R Programming            Basic Building Blocks              18
+## 5653             R Programming                        Functions              43
+## 5654             R Programming                  Dates and Times              27
+## 5655             R Programming                  Dates and Times              28
+## 5656             R Programming            Basic Building Blocks              25
+## 5657             R Programming            Basic Building Blocks              26
+## 5658             R Programming                  Dates and Times              30
+## 5659             R Programming            Basic Building Blocks              31
+## 5660             R Programming            Basic Building Blocks              33
+## 5661             R Programming            Basic Building Blocks              36
+## 5662             R Programming            Basic Building Blocks              38
+## 5663             R Programming            Basic Building Blocks              39
+## 5664             R Programming                        Functions              42
+## 5665             R Programming                        Functions              42
+## 5666             R Programming              Workspace and Files              40
+## 5667             R Programming              Workspace and Files              41
+## 5668             R Programming              Workspace and Files              42
+## 5669             R Programming                  Dates and Times              28
+## 5670             R Programming                  Dates and Times              29
+## 5671             R Programming              Workspace and Files              10
+## 5672             R Programming                  Dates and Times              32
+## 5673             R Programming                  Dates and Times              33
+## 5674             R Programming                  Dates and Times              35
+## 5675             R Programming                  Dates and Times              37
+## 5676             R Programming                  Dates and Times              38
+## 5677             R Programming                  Dates and Times              39
+## 5678             R Programming            Basic Building Blocks              40
+## 5679             R Programming                            Logic              55
+## 5680             R Programming              Workspace and Files               5
+## 5681             R Programming              Workspace and Files               6
+## 5682             R Programming                        Functions              35
+## 5683             R Programming              Workspace and Files               9
+## 5684             R Programming                        Functions              47
+## 5685             R Programming                        Functions              48
+## 5686             R Programming                        Functions              48
+## 5687             R Programming                        Functions              48
+## 5688             R Programming                        Functions              48
+## 5689             R Programming                        Functions              50
+## 5690             R Programming                        Functions              51
+## 5691             R Programming                        Functions              52
+## 5692             R Programming                        Functions              35
+## 5693             R Programming            Basic Building Blocks              41
+## 5694             R Programming                        Functions               3
+## 5695             R Programming              Workspace and Files               8
+## 5696             R Programming                        Functions               5
+## 5697             R Programming                        Functions               8
+## 5698             R Programming                        Functions              48
+## 5699             R Programming                        Functions              47
+## 5700             R Programming            Basic Building Blocks              41
+## 5701             R Programming            Basic Building Blocks              40
+## 5702             R Programming            Basic Building Blocks              14
+## 5703             R Programming            Basic Building Blocks              25
+## 5704             R Programming            Basic Building Blocks               8
+## 5705             R Programming            Basic Building Blocks               3
+## 5706             R Programming            Basic Building Blocks              23
+## 5707             R Programming            Basic Building Blocks              39
+## 5708             R Programming            Basic Building Blocks              11
+## 5709             R Programming            Basic Building Blocks              12
+## 5710             R Programming            Basic Building Blocks              16
+## 5711             R Programming            Basic Building Blocks              22
+## 5712             R Programming            Basic Building Blocks              15
+## 5713             R Programming            Basic Building Blocks              27
+## 5714             R Programming            Basic Building Blocks              31
+## 5715             R Programming            Basic Building Blocks              36
+## 5716             R Programming            Basic Building Blocks              18
+## 5717             R Programming            Basic Building Blocks              38
+## 5718             R Programming            Basic Building Blocks              33
+## 5719             R Programming            Basic Building Blocks              21
+## 5720             R Programming            Basic Building Blocks              11
+## 5721             R Programming            Basic Building Blocks              26
+## 5722             R Programming            Basic Building Blocks              12
+## 5723             R Programming            Basic Building Blocks              17
+## 5724             R Programming            Basic Building Blocks              21
+## 5725             R Programming            Basic Building Blocks              10
+##      correct attempt skipped   datetime  hash
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+## 5407    TRUE       1   FALSE 1504841435 64610
+## 5408    TRUE       2   FALSE 1504841253 64610
+## 5409    TRUE       1   FALSE 1504841445 64610
+## 5410    TRUE       1   FALSE 1504888964 34362
+## 5411    TRUE       2   FALSE 1506118825 34362
+## 5412    TRUE       2    TRUE 1504888707 34362
+## 5413   FALSE       1   FALSE 1504888184 34362
+## 5414    TRUE       2   FALSE 1504888209 34362
+## 5415    TRUE       1   FALSE 1504888294 34362
+## 5416    TRUE       1   FALSE 1504888888 34362
+## 5417   FALSE       1   FALSE 1506117738 34362
+## 5418   FALSE       2   FALSE 1506117755 34362
+## 5419    TRUE       3   FALSE 1506117762 34362
+## 5420   FALSE       1   FALSE 1504888327 34362
+## 5421   FALSE       1   FALSE 1506118793 34362
+## 5422    TRUE       1   FALSE 1506136575 34362
+## 5423    TRUE       1   FALSE 1506118837 34362
+## 5424    TRUE       1   FALSE 1506118744 34362
+## 5425    TRUE       1   FALSE 1504888015 34362
+## 5426    TRUE       3   FALSE 1504886090 34362
+## 5427    TRUE       1    TRUE 1504886933 34362
+## 5428   FALSE       1   FALSE 1504886956 34362
+## 5429    TRUE       2   FALSE 1504886997 34362
+## 5430    TRUE       1    TRUE 1504887286 34362
+## 5431    TRUE       1   FALSE 1504887532 34362
+## 5432    TRUE       1   FALSE 1504887572 34362
+## 5433   FALSE       1   FALSE 1504887589 34362
+## 5434    TRUE       2   FALSE 1504887595 34362
+## 5435    TRUE       1   FALSE 1504887646 34362
+## 5436    TRUE       1   FALSE 1504887680 34362
+## 5437    TRUE       1    TRUE 1504887845 34362
+## 5438    TRUE       1   FALSE 1504887910 34362
+## 5439   FALSE       7   FALSE 1506138735 34362
+## 5440    TRUE       8   FALSE 1506138777 34362
+## 5441   FALSE       1   FALSE 1506139189 34362
+## 5442    TRUE       2   FALSE 1506139211 34362
+## 5443    TRUE       1   FALSE 1506139348 34362
+## 5444   FALSE       1   FALSE 1506139802 34362
+## 5445   FALSE       2   FALSE 1506139830 34362
+## 5446   FALSE       3   FALSE 1506139891 34362
+## 5447    TRUE       4    TRUE 1506139898 34362
+## 5448    TRUE       1   FALSE 1504889009 34362
+## 5449    <NA>       1   FALSE 1504889016 34362
+## 5450    TRUE       1   FALSE 1506119495 34362
+## 5451    TRUE       1   FALSE 1506119507 34362
+## 5452    TRUE       1   FALSE 1506119536 34362
+## 5453    TRUE       1   FALSE 1506119620 34362
+## 5454   FALSE       1   FALSE 1506119624 34362
+## 5455    TRUE       2   FALSE 1506119648 34362
+## 5456    TRUE       1   FALSE 1506119657 34362
+## 5457    TRUE       1   FALSE 1506132322 34362
+## 5458    TRUE       1   FALSE 1506132357 34362
+## 5459    TRUE       1   FALSE 1506132406 34362
+## 5460    TRUE       1   FALSE 1506132426 34362
+## 5461    TRUE       1   FALSE 1506132512 34362
+## 5462    TRUE       1   FALSE 1506132524 34362
+## 5463    TRUE       1   FALSE 1506136592 34362
+## 5464   FALSE       1   FALSE 1506136643 34362
+## 5465    TRUE       2   FALSE 1506136666 34362
+## 5466    TRUE       1   FALSE 1506136682 34362
+## 5467    TRUE       1   FALSE 1506136712 34362
+## 5468    TRUE       1   FALSE 1506136717 34362
+## 5469    TRUE       1   FALSE 1506136723 34362
+## 5470    TRUE       1   FALSE 1506136737 34362
+## 5471    TRUE       1   FALSE 1506136748 34362
+## 5472    TRUE       1   FALSE 1506136760 34362
+## 5473   FALSE       1   FALSE 1506137768 34362
+## 5474   FALSE       2   FALSE 1506137860 34362
+## 5475   FALSE       3   FALSE 1506138041 34362
+## 5476   FALSE       4   FALSE 1506138121 34362
+## 5477   FALSE       5   FALSE 1506138232 34362
+## 5478   FALSE       6   FALSE 1506138625 34362
+## 5479    TRUE       1   FALSE 1506117151 34362
+## 5480    TRUE       1   FALSE 1506117472 34362
+## 5481    TRUE       1   FALSE 1506117582 34362
+## 5482    TRUE       1   FALSE 1506117600 34362
+## 5483    TRUE       1   FALSE 1506117677 34362
+## 5484    TRUE       1   FALSE 1506117706 34362
+## 5485    TRUE       1   FALSE 1506114680 34362
+## 5486    TRUE       1   FALSE 1506114712 34362
+## 5487   FALSE       1   FALSE 1506114802 34362
+## 5488    TRUE       2   FALSE 1506114816 34362
+## 5489    TRUE       1   FALSE 1506114859 34362
+## 5490    TRUE       1   FALSE 1506114893 34362
+## 5491    TRUE       1   FALSE 1506114953 34362
+## 5492    TRUE       1   FALSE 1506118853 34362
+## 5493    TRUE       1   FALSE 1506118889 34362
+## 5494    TRUE       1   FALSE 1506118936 34362
+## 5495    TRUE       1   FALSE 1506118958 34362
+## 5496   FALSE       1   FALSE 1506118992 34362
+## 5497    TRUE       2   FALSE 1506119005 34362
+## 5498    TRUE       1   FALSE 1506119019 34362
+## 5499    TRUE       1   FALSE 1506119032 34362
+## 5500    TRUE       1   FALSE 1506119039 34362
+## 5501    TRUE       1   FALSE 1506119041 34362
+## 5502    TRUE       1   FALSE 1506112971 34362
+## 5503    TRUE       1   FALSE 1506113006 34362
+## 5504    TRUE       1   FALSE 1506113015 34362
+## 5505    TRUE       1   FALSE 1506113019 34362
+## 5506    <NA>       1   FALSE 1506113020 34362
+## 5507    TRUE       1   FALSE 1506113278 34362
+## 5508    TRUE       1   FALSE 1506113324 34362
+## 5509    TRUE       1   FALSE 1506113760 34362
+## 5510    TRUE       1   FALSE 1506113769 34362
+## 5511    TRUE       1   FALSE 1506113810 34362
+## 5512    TRUE       1   FALSE 1506113812 34362
+## 5513    TRUE       1   FALSE 1506113916 34362
+## 5514    TRUE       1   FALSE 1506113926 34362
+## 5515    TRUE       1   FALSE 1506113938 34362
+## 5516    TRUE       1   FALSE 1506113970 34362
+## 5517   FALSE       1   FALSE 1506114051 34362
+## 5518   FALSE       2   FALSE 1506114094 34362
+## 5519   FALSE       3   FALSE 1506114277 34362
+## 5520    TRUE       4   FALSE 1506114287 34362
+## 5521    TRUE       1   FALSE 1506114375 34362
+## 5522   FALSE       1   FALSE 1506114412 34362
+## 5523    TRUE       2   FALSE 1506114468 34362
+## 5524    TRUE       1   FALSE 1506114663 34362
+## 5525   FALSE       1   FALSE 1506110768 34362
+## 5526   FALSE       2   FALSE 1506111038 34362
+## 5527   FALSE       3   FALSE 1506111097 34362
+## 5528    TRUE       4   FALSE 1506111119 34362
+## 5529    TRUE       1   FALSE 1506111166 34362
+## 5530    TRUE       1   FALSE 1506111231 34362
+## 5531    TRUE       1   FALSE 1506111233 34362
+## 5532   FALSE       1   FALSE 1506114975 34362
+## 5533    TRUE       2   FALSE 1506115001 34362
+## 5534    TRUE       1   FALSE 1506115038 34362
+## 5535   FALSE       1   FALSE 1506115043 34362
+## 5536    TRUE       2   FALSE 1506115062 34362
+## 5537    TRUE       1   FALSE 1506115083 34362
+## 5538    TRUE       1   FALSE 1506115222 34362
+## 5539    TRUE       1   FALSE 1506115225 34362
+## 5540    <NA>       1   FALSE 1506115226 34362
+## 5541    TRUE       1   FALSE 1506115908 34362
+## 5542   FALSE       1   FALSE 1506115988 34362
+## 5543    TRUE       2   FALSE 1506116001 34362
+## 5544    TRUE       1   FALSE 1506116063 34362
+## 5545    TRUE       1   FALSE 1506116101 34362
+## 5546    TRUE       1   FALSE 1506116112 34362
+## 5547    TRUE       1   FALSE 1506116129 34362
+## 5548    TRUE       1   FALSE 1506116143 34362
+## 5549    TRUE       1   FALSE 1506116182 34362
+## 5550   FALSE       1   FALSE 1506116220 34362
+## 5551   FALSE       2   FALSE 1506116393 34362
+## 5552    TRUE       3   FALSE 1506116401 34362
+## 5553    TRUE       1   FALSE 1506116527 34362
+## 5554    TRUE       1   FALSE 1506116542 34362
+## 5555    TRUE       1   FALSE 1506116948 34362
+## 5556    TRUE       1   FALSE 1506116972 34362
+## 5557    TRUE       1   FALSE 1506117021 34362
+## 5558    TRUE       1   FALSE 1506117051 34362
+## 5559    TRUE       1   FALSE 1506117065 34362
+## 5560   FALSE       2   FALSE 1506110381 34362
+## 5561   FALSE       3   FALSE 1506110401 34362
+## 5562    TRUE       4   FALSE 1506110484 34362
+## 5563   FALSE       1   FALSE 1506110533 34362
+## 5564    TRUE       2   FALSE 1506110591 34362
+## 5565    TRUE       1   FALSE 1506119115 34362
+## 5566    TRUE       1   FALSE 1506119126 34362
+## 5567    TRUE       1   FALSE 1506119137 34362
+## 5568    TRUE       1   FALSE 1506119259 34362
+## 5569    TRUE       1   FALSE 1506119448 34362
+## 5570   FALSE       1   FALSE 1506119453 34362
+## 5571    TRUE       2   FALSE 1506119458 34362
+## 5572    <NA>       1   FALSE 1506111234 34362
+## 5573    TRUE       1   FALSE 1506111521 34362
+## 5574    TRUE       1   FALSE 1506111528 34362
+## 5575    TRUE       1   FALSE 1506111608 34362
+## 5576    TRUE       1   FALSE 1506111636 34362
+## 5577    TRUE       1   FALSE 1506111683 34362
+## 5578    TRUE       1   FALSE 1506111716 34362
+## 5579    TRUE       1   FALSE 1506111720 34362
+## 5580    TRUE       1   FALSE 1506111759 34362
+## 5581    TRUE       1   FALSE 1506112837 34362
+## 5582    TRUE       1   FALSE 1506112865 34362
+## 5583    TRUE       1    TRUE 1504885877 34362
+## 5584    TRUE       1   FALSE 1506109084 34362
+## 5585    TRUE       1    TRUE 1506109339 34362
+## 5586    TRUE       1   FALSE 1506109387 34362
+## 5587    TRUE       1   FALSE 1506109391 34362
+## 5588    TRUE       1   FALSE 1506109755 34362
+## 5589    TRUE       1   FALSE 1506109906 34362
+## 5590    TRUE       1   FALSE 1506109918 34362
+## 5591    TRUE       1   FALSE 1506109951 34362
+## 5592   FALSE       1   FALSE 1506110113 34362
+## 5593    TRUE       2   FALSE 1506110152 34362
+## 5594    TRUE       1   FALSE 1506110158 34362
+## 5595    TRUE       1   FALSE 1506110209 34362
+## 5596   FALSE       1   FALSE 1506110295 34362
+## 5597    TRUE       2   FALSE 1506110315 34362
+## 5598    TRUE       1   FALSE 1506110320 34362
+## 5599   FALSE       1   FALSE 1506110359 34362
+## 5600    TRUE       1   FALSE 1506107547 34362
+## 5601    TRUE       1   FALSE 1506107860 34362
+## 5602    TRUE       1   FALSE 1506107992 34362
+## 5603   FALSE       1   FALSE 1506108017 34362
+## 5604    TRUE       2   FALSE 1506108034 34362
+## 5605    TRUE       1   FALSE 1506104895 34362
+## 5606    TRUE       1   FALSE 1506104920 34362
+## 5607    TRUE       1   FALSE 1506104924 34362
+## 5608    TRUE       1   FALSE 1506105185 34362
+## 5609    TRUE       1   FALSE 1506105211 34362
+## 5610    TRUE       1   FALSE 1506105226 34362
+## 5611    TRUE       1   FALSE 1506105951 34362
+## 5612   FALSE       1   FALSE 1506119480 34362
+## 5613    TRUE       2   FALSE 1506119491 34362
+## 5614   FALSE       3   FALSE 1506140142 34362
+## 5615    TRUE       4    TRUE 1506140241 34362
+## 5616   FALSE       1   FALSE 1506140322 34362
+## 5617    TRUE       2   FALSE 1506140327 34362
+## 5618    TRUE       1   FALSE 1506140378 34362
+## 5619   FALSE       1   FALSE 1506140933 34362
+## 5620    TRUE       2   FALSE 1506140983 34362
+## 5621    TRUE       1   FALSE 1506141096 34362
+## 5622   FALSE       1   FALSE 1506142241 34362
+## 5623   FALSE       2   FALSE 1506142386 34362
+## 5624    TRUE       1    TRUE 1504885915 34362
+## 5625    TRUE       1   FALSE 1504885972 34362
+## 5626    TRUE       1   FALSE 1504885986 34362
+## 5627    TRUE       1   FALSE 1504886007 34362
+## 5628   FALSE       1   FALSE 1504886026 34362
+## 5629   FALSE       2   FALSE 1504886063 34362
+## 5630   FALSE       1   FALSE 1506106778 34362
+## 5631    TRUE       2   FALSE 1506106797 34362
+## 5632    TRUE       1   FALSE 1506106940 34362
+## 5633    TRUE       1   FALSE 1506107201 34362
+## 5634    TRUE       1   FALSE 1506107296 34362
+## 5635    TRUE       1   FALSE 1506107336 34362
+## 5636    TRUE       1   FALSE 1506107362 34362
+## 5637    TRUE       1   FALSE 1506107383 34362
+## 5638   FALSE       1   FALSE 1506107452 34362
+## 5639    TRUE       2   FALSE 1506107463 34362
+## 5640    TRUE       1   FALSE 1506106018 34362
+## 5641    TRUE       1   FALSE 1506106043 34362
+## 5642    TRUE       1   FALSE 1506106055 34362
+## 5643    TRUE       1   FALSE 1506104741 34362
+## 5644    TRUE       1   FALSE 1506104870 34362
+## 5645    TRUE       1   FALSE 1506106117 34362
+## 5646    TRUE       1   FALSE 1506108350 34362
+## 5647    TRUE       1   FALSE 1506108369 34362
+## 5648   FALSE       1   FALSE 1506108421 34362
+## 5649    TRUE       2   FALSE 1506108577 34362
+## 5650   FALSE       1   FALSE 1506108806 34362
+## 5651    TRUE       2   FALSE 1506108820 34362
+## 5652    TRUE       1   FALSE 1506105962 34362
+## 5653    TRUE       1    TRUE 1506142792 34362
+## 5654    TRUE       1    TRUE 1506132695 34362
+## 5655   FALSE       1   FALSE 1506132764 34362
+## 5656    TRUE       1   FALSE 1506106088 34362
+## 5657    TRUE       1   FALSE 1506106112 34362
+## 5658    TRUE       1   FALSE 1506132845 34362
+## 5659    TRUE       1   FALSE 1506106207 34362
+## 5660    TRUE       1   FALSE 1506106233 34362
+## 5661    TRUE       1   FALSE 1506106320 34362
+## 5662    TRUE       1   FALSE 1506106358 34362
+## 5663    TRUE       1   FALSE 1506106366 34362
+## 5664   FALSE       3   FALSE 1506142573 34362
+## 5665    TRUE       4    TRUE 1506142686 34362
+## 5666    TRUE       1   FALSE 1506108879 34362
+## 5667    TRUE       1   FALSE 1506108883 34362
+## 5668    <NA>       1   FALSE 1506108884 34362
+## 5669    TRUE       2   FALSE 1506132825 34362
+## 5670    TRUE       1   FALSE 1506132831 34362
+## 5671    TRUE       1   FALSE 1506106670 34362
+## 5672    TRUE       1   FALSE 1506132908 34362
+## 5673    TRUE       1   FALSE 1506132929 34362
+## 5674    TRUE       1   FALSE 1506132958 34362
+## 5675    TRUE       1   FALSE 1506132975 34362
+## 5676    TRUE       1   FALSE 1506132977 34362
+## 5677    <NA>       1   FALSE 1506132978 34362
+## 5678    TRUE       1   FALSE 1506106370 34362
+## 5679    <NA>       1   FALSE 1506119042 34362
+## 5680    TRUE       1   FALSE 1506106592 34362
+## 5681    TRUE       1   FALSE 1506106606 34362
+## 5682   FALSE       2   FALSE 1506140133 34362
+## 5683    TRUE       1   FALSE 1506106656 34362
+## 5684    TRUE       2    TRUE 1506143157 34362
+## 5685   FALSE       2   FALSE 1506143252 34362
+## 5686   FALSE       3   FALSE 1506143268 34362
+## 5687   FALSE       4   FALSE 1506143292 34362
+## 5688    TRUE       5    TRUE 1506143300 34362
+## 5689    TRUE       1   FALSE 1506143310 34362
+## 5690    TRUE       1   FALSE 1506143312 34362
+## 5691    <NA>       1   FALSE 1506143314 34362
+## 5692   FALSE       1   FALSE 1506140022 34362
+## 5693    <NA>       1      NA 1506106377 34362
+## 5694    TRUE       1   FALSE 1506136516 34362
+## 5695    TRUE       1   FALSE 1506106648 34362
+## 5696    TRUE       1   FALSE 1506136526 34362
+## 5697    TRUE       1   FALSE 1506136538 34362
+## 5698   FALSE       1   FALSE 1506143231 34362
+## 5699   FALSE       1   FALSE 1506143130 34362
+## 5700    <NA>       1      NA 1505233838 35235
+## 5701    TRUE       1   FALSE 1505233830 35235
+## 5702    TRUE       1   FALSE 1505159998 35235
+## 5703    TRUE       1   FALSE 1505233569 35235
+## 5704    TRUE       1   FALSE 1505159873 35235
+## 5705    TRUE       1   FALSE 1505159831 35235
+## 5706    TRUE       1   FALSE 1505228886 35235
+## 5707    TRUE       1   FALSE 1505233824 35235
+## 5708    TRUE       2   FALSE 1505159957 35235
+## 5709   FALSE       1   FALSE 1505159959 35235
+## 5710    TRUE       1   FALSE 1505160038 35235
+## 5711    TRUE       1   FALSE 1505228880 35235
+## 5712    TRUE       1   FALSE 1505160013 35235
+## 5713    TRUE       1   FALSE 1505233585 35235
+## 5714    TRUE       1   FALSE 1505233657 35235
+## 5715    TRUE       1   FALSE 1505233766 35235
+## 5716    TRUE       1   FALSE 1505160064 35235
+## 5717    TRUE       1   FALSE 1505233815 35235
+## 5718    TRUE       1   FALSE 1505233722 35235
+## 5719    TRUE       2   FALSE 1505228867 35235
+## 5720   FALSE       1   FALSE 1505159909 35235
+## 5721    TRUE       1   FALSE 1505233578 35235
+## 5722    TRUE       2   FALSE 1505159969 35235
+## 5723    TRUE       1   FALSE 1505160053 35235
+## 5724   FALSE       1   FALSE 1505228847 35235
+## 5725    TRUE       1   FALSE 1505159886 35235
+

The variables are:

+

course_name - the name of the R course the student attempted
+lesson_name - the lesson name
+question_number - the question number attempted correct - whether the question was answered correctly
+attempt - how many times the student attempted the question
+skipped - whether the student skipped the question
+datetime - the date and time the student attempted the question
+hash - anonymyzed student ID

+
    +
  1. Create a new data frame that only includes the variables hash, lesson_name and attempt called DF2
  2. +
+
library(dplyr)
+DF2 <- dplyr::select(DF1, hash, lesson_name, attempt)
+DF2
+
##       hash                      lesson_name attempt
+## 1    30802                  Dates and Times       1
+## 2    30802                        Functions       1
+## 3    30802            Basic Building Blocks       1
+## 4    30802                  Dates and Times       1
+## 5    30802                  Dates and Times       1
+## 6    30802              Workspace and Files       1
+## 7    30802                        Functions       1
+## 8    30802                  Dates and Times       1
+## 9    30802                  Dates and Times       1
+## 10   30802                  Dates and Times       1
+## 11   30802            Basic Building Blocks       1
+## 12   30802                          Vectors       1
+## 13   30802            Basic Building Blocks       1
+## 14   30802                          Vectors       2
+## 15   30802              Workspace and Files       1
+## 16   30802               Subsetting Vectors       1
+## 17   30802                  Dates and Times       1
+## 18   30802               Subsetting Vectors       1
+## 19   30802                          Vectors       1
+## 20   30802                  Dates and Times       1
+## 21   30802               Subsetting Vectors       1
+## 22   30802                  Dates and Times       1
+## 23   30802                  Dates and Times       1
+## 24   30802               Subsetting Vectors       1
+## 25   30802                        Functions       1
+## 26   30802               Subsetting Vectors       1
+## 27   30802            Basic Building Blocks       1
+## 28   30802                          Vectors       1
+## 29   30802                            Logic       1
+## 30   30802            Basic Building Blocks       1
+## 31   30802              Workspace and Files       1
+## 32   30802              Workspace and Files       1
+## 33   30802               Subsetting Vectors       1
+## 34   30802                  Dates and Times       1
+## 35   30802              Workspace and Files       1
+## 36   30802                  Dates and Times       1
+## 37   30802                  Dates and Times       1
+## 38   30802                          Vectors       1
+## 39   30802               Subsetting Vectors       1
+## 40   30802               Subsetting Vectors       1
+## 41   30802            Basic Building Blocks       1
+## 42   30802                  Dates and Times       1
+## 43   30802                  Dates and Times       1
+## 44   30802            Basic Building Blocks       1
+## 45   30802               Subsetting Vectors       1
+## 46   30802                            Logic       1
+## 47   30802              Workspace and Files       1
+## 48   30802               Subsetting Vectors       1
+## 49   30802                            Logic       1
+## 50   30802                            Logic       2
+## 51   30802               Subsetting Vectors       1
+## 52   30802                        Functions       1
+## 53   30802                            Logic       1
+## 54   30802                  Dates and Times       1
+## 55   30802                          Vectors       1
+## 56   30802            Basic Building Blocks       1
+## 57   30802                            Logic       1
+## 58   30802                            Logic       1
+## 59   30802                   Missing Values       1
+## 60   30802                            Logic       2
+## 61   30802              Workspace and Files       1
+## 62   30802               Subsetting Vectors       1
+## 63   30802              Workspace and Files       1
+## 64   30802              Workspace and Files       1
+## 65   30802                  Dates and Times       1
+## 66   30802                            Logic       1
+## 67   30802            Basic Building Blocks       1
+## 68   30802                  Dates and Times       1
+## 69   30802                   Missing Values       1
+## 70   30802                   Missing Values       1
+## 71   30802                   Missing Values       1
+## 72   30802               Subsetting Vectors       1
+## 73   30802                            Logic       1
+## 74   30802                            Logic       1
+## 75   30802                            Logic       1
+## 76   30802                  Dates and Times       1
+## 77   30802                  Dates and Times       1
+## 78   30802                  Dates and Times       1
+## 79   30802                        Functions       1
+## 80   30802                  Dates and Times       1
+## 81   30802                            Logic       1
+## 82   30802                  Dates and Times       1
+## 83   30802                   Missing Values       1
+## 84   30802              Workspace and Files       1
+## 85   30802              Workspace and Files       1
+## 86   30802                        Functions       1
+## 87   30802            Basic Building Blocks       1
+## 88   30802            Basic Building Blocks       1
+## 89   30802            Basic Building Blocks       1
+## 90   30802               Subsetting Vectors       1
+## 91   30802                  Dates and Times       1
+## 92   30802               Subsetting Vectors       1
+## 93   30802                          Vectors       1
+## 94   30802                          Vectors       1
+## 95   30802              Workspace and Files       1
+## 96   30802              Workspace and Files       1
+## 97   30802                        Functions       1
+## 98   30802                            Logic       1
+## 99   30802              Workspace and Files       1
+## 100  30802              Workspace and Files       1
+## 101  30802                   Missing Values       1
+## 102  30802              Workspace and Files       1
+## 103  30802              Workspace and Files       1
+## 104  30802               Subsetting Vectors       1
+## 105  30802              Workspace and Files       2
+## 106  30802              Workspace and Files       1
+## 107  30802                  Dates and Times       1
+## 108  30802               Subsetting Vectors       1
+## 109  30802              Workspace and Files       1
+## 110  30802              Workspace and Files       1
+## 111  30802                            Logic       1
+## 112  30802                            Logic       1
+## 113  30802                            Logic       1
+## 114  30802                  Dates and Times       1
+## 115  30802               Subsetting Vectors       1
+## 116  30802               Subsetting Vectors       1
+## 117  30802               Subsetting Vectors       1
+## 118  30802               Subsetting Vectors       1
+## 119  30802                          Vectors       1
+## 120  30802               Subsetting Vectors       1
+## 121  30802              Workspace and Files       1
+## 122  30802                   Missing Values       1
+## 123  30802                   Missing Values       1
+## 124  30802                   Missing Values       1
+## 125  30802                            Logic       1
+## 126  30802                            Logic       1
+## 127  30802                          Vectors       1
+## 128  30802                            Logic       1
+## 129  30802                            Logic       1
+## 130  30802            Basic Building Blocks       1
+## 131  30802            Basic Building Blocks       1
+## 132  30802               Subsetting Vectors       1
+## 133  30802                            Logic       1
+## 134  30802            Basic Building Blocks       2
+## 135  30802            Basic Building Blocks       1
+## 136  30802            Basic Building Blocks       1
+## 137  30802                            Logic       1
+## 138  30802                   Missing Values       1
+## 139  30802                   Missing Values       1
+## 140  30802              Workspace and Files       1
+## 141  30802              Workspace and Files       1
+## 142  30802                            Logic       1
+## 143  30802              Workspace and Files       1
+## 144  30802                            Logic       2
+## 145  30802                            Logic       1
+## 146  30802            Basic Building Blocks       1
+## 147  30802                   Missing Values       1
+## 148  30802                   Missing Values       1
+## 149  30802                            Logic       1
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+## 2317 68515               Subsetting Vectors       1
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+## 2331 68515               Subsetting Vectors       1
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+## 2336 68515               Subsetting Vectors       1
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+## 2341 67994         Matrices and Data Frames       1
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+## 2343 67994         Matrices and Data Frames       1
+## 2344 67994         Matrices and Data Frames       2
+## 2345 67994         Matrices and Data Frames       3
+## 2346 67994         Matrices and Data Frames       1
+## 2347 67994         Matrices and Data Frames       1
+## 2348 67994         Matrices and Data Frames       1
+## 2349 67994         Matrices and Data Frames       4
+## 2350 67994         Matrices and Data Frames       1
+## 2351 67994         Matrices and Data Frames       1
+## 2352 67994         Matrices and Data Frames       1
+## 2353 67994         Matrices and Data Frames       1
+## 2354 67994         Matrices and Data Frames       1
+## 2355 67994         Matrices and Data Frames       1
+## 2356 67994         Matrices and Data Frames       1
+## 2357 67994         Matrices and Data Frames       1
+## 2358 67994         Matrices and Data Frames       1
+## 2359 67994         Matrices and Data Frames       1
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+## 2367 67994         Matrices and Data Frames       1
+## 2368 67994         Matrices and Data Frames       1
+## 2369 67994         Matrices and Data Frames       1
+## 2370 20682                                       NA
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+## 2373 32870            Basic Building Blocks       1
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+## 2375 32870            Basic Building Blocks       1
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+## 2585 86730                                       NA
+## 2586 21536            Graphics_Devices_in_R       1
+## 2587 21536            Graphics_Devices_in_R       1
+## 2588 21536            Graphics_Devices_in_R       1
+## 2589 21536            Graphics_Devices_in_R       1
+## 2590 21536            Graphics_Devices_in_R       1
+## 2591 21536            Graphics_Devices_in_R       1
+## 2592 21536            Graphics_Devices_in_R       1
+## 2593 21536            Graphics_Devices_in_R       2
+## 2594 21536 Grouping and Chaining with dplyr       1
+## 2595 21536          Grouping and Chaining w      NA
+## 2596 21536            Graphics_Devices_in_R       1
+## 2597 21536            Graphics_Devices_in_R       1
+## 2598 21536             Base_Plotting_System       2
+## 2599 21536             Base_Plotting_System       3
+## 2600 21536             Base_Plotting_System       1
+## 2601 21536               Clustering_Example       1
+## 2602 21536               Clustering_Example       1
+## 2603 21536            Graphics_Devices_in_R       1
+## 2604 21536               K_Means_Clustering       1
+## 2605 21536          Tidying Data with tidyr       1
+## 2606 21536          Tidying Data with tidyr       1
+## 2607 21536     Manipulating Data with dplyr       1
+## 2608 21536            Graphics_Devices_in_R       1
+## 2609 21536            Graphics_Devices_in_R       1
+## 2610 21536             Base_Plotting_System       1
+## 2611 21536     Manipulating Data with dplyr       4
+## 2612 21536     Manipulating Data with dplyr       2
+## 2613 21536     Manipulating Data with dplyr       1
+## 2614 21536     Manipulating Data with dplyr       1
+## 2615 21536     Manipulating Data with dplyr       1
+## 2616 21536     Manipulating Data with dplyr       1
+## 2617 21536     Manipulating Data with dplyr       1
+## 2618 21536               K_Means_Clustering       1
+## 2619 21536               K_Means_Clustering       1
+## 2620 21536                                       NA
+## 2621 21536             Base_Plotting_System       2
+## 2622 21536             Base_Plotting_System       1
+## 2623 21536     Manipulating Data with dplyr       3
+## 2624 21536                  Looking at Data       1
+## 2625 21536                  Looking at Data       1
+## 2626 21536                  Looking at Data       1
+## 2627 21536                  Looking at Data       1
+## 2628 21536             Base_Plotting_System       1
+## 2629 21536             Base_Plotting_System       1
+## 2630 21536             Base_Plotting_System       2
+## 2631 21536                  Looking at Data       1
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+## 2634 21536    Principles_of_Analytic_Graphs       1
+## 2635 21536     Manipulating Data with dplyr       2
+## 2636 21536                  Looking at Data       1
+## 2637 21536               Clustering_Example       1
+## 2638 21536               Clustering_Example       1
+## 2639 21536               Clustering_Example       1
+## 2640 21536               Clustering_Example       1
+## 2641 21536               Clustering_Example       1
+## 2642 21536               Clustering_Example       1
+## 2643 21536                                       NA
+## 2644 21536 Grouping and Chaining with dplyr       2
+## 2645 21536          Tidying Data with tidyr       1
+## 2646 21536          Tidying Data with tidyr       2
+## 2647 21536          Tidying Data with tidyr       2
+## 2648 21536                  Looking at Data       1
+## 2649 21536    Principles_of_Analytic_Graphs       1
+## 2650 21536    Principles_of_Analytic_Graphs       1
+## 2651 21536    Principles_of_Analytic_Graphs       1
+## 2652 21536     Manipulating Data with dplyr       1
+## 2653 21536     Manipulating Data with dplyr       1
+## 2654 21536                  Looking at Data       1
+## 2655 21536                  Looking at Data       1
+## 2656 21536                  Looking at Data       1
+## 2657 21536                  Looking at Data       1
+## 2658 21536    Principles_of_Analytic_Graphs       2
+## 2659 21536    Principles_of_Analytic_Graphs       1
+## 2660 21536    Principles_of_Analytic_Graphs       2
+## 2661 21536                  Looking at Data       1
+## 2662 21536             Base_Plotting_System       1
+## 2663 21536               Clustering_Example       1
+## 2664 21536               Exploratory_Graphs       2
+## 2665 21536               Exploratory_Graphs       1
+## 2666 21536               Exploratory_Graphs       1
+## 2667 21536               Exploratory_Graphs       1
+## 2668 21536                          Looking      NA
+## 2669 21536               Exploratory_Graphs       1
+## 2670 21536               Exploratory_Graphs       1
+## 2671 21536             Base_Plotting_System       1
+## 2672 21536               Clustering_Example       1
+## 2673 21536               Clustering_Example       2
+## 2674 21536          Tidying Data with tidyr       1
+## 2675 21536               Clustering_Example       1
+## 2676 21536          Tidying Data with tidyr       2
+## 2677 21536                    Tidying Data       NA
+## 2678 21536               Exploratory_Graphs       1
+## 2679 21536               K_Means_Clustering       4
+## 2680 21536                  Looking at Data       1
+## 2681 21536                                       NA
+## 2682 21536               K_Means_Clustering       1
+## 2683 21536               K_Means_Clustering       1
+## 2684 21536                      Hierarchica      NA
+## 2685 21536          Tidying Data with tidyr       1
+## 2686 21536 Grouping and Chaining with dplyr       1
+## 2687 21536             Base_Plotting_System       1
+## 2688 21536               Clustering_Example       1
+## 2689 21536               Exploratory_Graphs       1
+## 2690 21536               Exploratory_Graphs       1
+## 2691 21536          Hierarchical_Clustering       3
+## 2692 21536          Hierarchical_Clustering       4
+## 2693 21536               K_Means_Clustering       5
+## 2694 21536    Principles_of_Analytic_Graphs       1
+## 2695 21536    Principles_of_Analytic_Graphs       1
+## 2696 21536    Principles_of_Analytic_Graphs       1
+## 2697 21536    Principles_of_Analytic_Graphs       1
+## 2698 21536               Exploratory_Graphs       1
+## 2699 21536             Base_Plotting_System       2
+## 2700 21536 Grouping and Chaining with dplyr       1
+## 2701 21536          Hierarchical_Clustering       1
+## 2702 21536          Hierarchical_Clustering       1
+## 2703 21536          Hierarchical_Clustering       2
+## 2704 21536               Exploratory_Graphs       1
+## 2705 21536               K_Means_Clustering       1
+## 2706 21536          Hierarchical_Clustering       5
+## 2707 21536               K_Means_Clustering       1
+## 2708 21536               K_Means_Clustering       2
+## 2709 21536               K_Means_Clustering       1
+## 2710 21536          Hierarchical_Clustering       1
+## 2711 21536 Grouping and Chaining with dplyr       1
+## 2712 21536 Grouping and Chaining with dplyr       2
+## 2713 21536          Hierarchical_Clustering       1
+## 2714 21536          Tidying Data with tidyr       1
+## 2715 21536               Exploratory_Graphs       1
+## 2716 21536               Exploratory_Graphs       1
+## 2717 21536          Hierarchical_Clustering       1
+## 2718 21536          Hierarchical_Clustering       1
+## 2719 21536               K_Means_Clustering       2
+## 2720 21536    Principles_of_Analytic_Graphs       1
+## 2721 21536          Tidying Data with tidyr       1
+## 2722 21536          Tidying Data with tidyr       1
+## 2723 21536          Hierarchical_Clustering       1
+## 2724 21536 Grouping and Chaining with dplyr       1
+## 2725 21536          Hierarchical_Clustering       1
+## 2726 21536 Grouping and Chaining with dplyr       1
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+## 3591 11801                                       NA
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+## 3607 11801     Manipulating Data with dplyr       1
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+## 3713 27264               Subsetting Vectors       2
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+## 3732 27264                            Logic       1
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+## 3766 27264                        Functions       2
+## 3767 27264                        Functions       1
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+## 3771 27264                        Functions       1
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+## 3773 27264                        Functions       2
+## 3774 27264                        Functions       3
+## 3775 27264                        Functions       1
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+## 3781 27264                        Functions       1
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+## 3784 27264                        Functions       2
+## 3785 27264                        Functions       1
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+## 3791 27264                        Functions       1
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+## 3799 27264                        Functions       1
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+## 3801 27264                        Functions       1
+## 3802 27264                        Functions       1
+## 3803 27264         Matrices and Data Frames       1
+## 3804 27264         Matrices and Data Frames       2
+## 3805 27264         Matrices and Data Frames       1
+## 3806 27264         Matrices and Data Frames       1
+## 3807 27264         Matrices and Data Frames       1
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+## 3809 27264         Matrices and Data Frames       1
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+## 3811 27264         Matrices and Data Frames       1
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+## 3813 27264         Matrices and Data Frames       1
+## 3814 27264         Matrices and Data Frames       1
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+## 3825 27264         Matrices and Data Frames       1
+## 3826 27264         Matrices and Data Frames       1
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+## 3830 27264                            Logic       1
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+## 3862 27264                 Plotting_Systems       1
+## 3863 27264                 Plotting_Systems       2
+## 3864 27264                 Plotting_Systems       1
+## 3865 27264                 Plotting_Systems       1
+## 3866 27264                 Plotting_Systems       1
+## 3867 27264                 Plotting_Systems       1
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+## 3870 27264                 Plotting_Systems       1
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+## 3872 27264                 Plotting_Systems       1
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+## 3876 27264                 Plotting_Systems       1
+## 3877 27264                 Plotting_Systems       1
+## 3878 27264                 Plotting_Systems       1
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+## 3882 27264                 Plotting_Systems       1
+## 3883 27264                 Plotting_Systems       1
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+## 3886 27264     Manipulating Data with dplyr       1
+## 3887 27264     Manipulating Data with dplyr       1
+## 3888 27264     Manipulating Data with dplyr       1
+## 3889 27264     Manipulating Data with dplyr       1
+## 3890 27264     Manipulating Data with dplyr       1
+## 3891 27264     Manipulating Data with dplyr       2
+## 3892 27264     Manipulating Data with dplyr       3
+## 3893 27264     Manipulating Data with dplyr       1
+## 3894 27264     Manipulating Data with dplyr       1
+## 3895 27264     Manipulating Data with dplyr       1
+## 3896 27264     Manipulating Data with dplyr       1
+## 3897 27264     Manipulating Data with dplyr       1
+## 3898 27264     Manipulating Data with dplyr       1
+## 3899 27264     Manipulating Data with dplyr       1
+## 3900 27264     Manipulating Data with dplyr       1
+## 3901 27264     Manipulating Data with dplyr       1
+## 3902 27264     Manipulating Data with dplyr       1
+## 3903 27264     Manipulating Data with dplyr       1
+## 3904 27264     Manipulating Data with dplyr       1
+## 3905 27264     Manipulating Data with dplyr       1
+## 3906 27264     Manipulating Data with dplyr       1
+## 3907 27264     Manipulating Data with dplyr       1
+## 3908 27264     Manipulating Data with dplyr       1
+## 3909 27264     Manipulating Data with dplyr       1
+## 3910 27264     Manipulating Data with dplyr       1
+## 3911 27264     Manipulating Data with dplyr       2
+## 3912 27264     Manipulating Data with dplyr       1
+## 3913 27264     Manipulating Data with dplyr       1
+## 3914 27264     Manipulating Data with dplyr       1
+## 3915 27264     Manipulating Data with dplyr       1
+## 3916 27264     Manipulating Data with dplyr       1
+## 3917 27264     Manipulating Data with dplyr       1
+## 3918 27264     Manipulating Data with dplyr       1
+## 3919 27264     Manipulating Data with dplyr       1
+## 3920 27264     Manipulating Data with dplyr       1
+## 3921 27264     Manipulating Data with dplyr       1
+## 3922 27264     Manipulating Data with dplyr       1
+## 3923 27264     Manipulating Data with dplyr       1
+## 3924 27264     Manipulating Data with dplyr       1
+## 3925 27264     Manipulating Data with dplyr       1
+## 3926 27264     Manipulating Data with dplyr       1
+## 3927 27264     Manipulating Data with dplyr       1
+## 3928 27264     Manipulating Data with dplyr       1
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+## 3930 27264             Base_Plotting_System       1
+## 3931 27264             Base_Plotting_System       1
+## 3932 27264             Base_Plotting_System       1
+## 3933 27264             Base_Plotting_System       2
+## 3934 27264             Base_Plotting_System       3
+## 3935 27264             Base_Plotting_System       1
+## 3936 27264             Base_Plotting_System       1
+## 3937 27264             Base_Plotting_System       1
+## 3938 27264             Base_Plotting_System       1
+## 3939 27264             Base_Plotting_System       1
+## 3940 27264 Grouping and Chaining with dplyr       2
+## 3941 27264 Grouping and Chaining with dplyr       1
+## 3942 27264 Grouping and Chaining with dplyr       1
+## 3943 27264 Grouping and Chaining with dplyr       1
+## 3944 27264 Grouping and Chaining with dplyr       1
+## 3945 27264 Grouping and Chaining with dplyr       1
+## 3946 27264 Grouping and Chaining with dplyr       1
+## 3947 27264 Grouping and Chaining with dplyr       1
+## 3948 27264 Grouping and Chaining with dplyr       2
+## 3949 27264 Grouping and Chaining with dplyr       3
+## 3950 27264 Grouping and Chaining with dplyr       1
+## 3951 27264 Grouping and Chaining with dplyr       1
+## 3952 27264 Grouping and Chaining with dplyr       1
+## 3953 27264 Grouping and Chaining with dplyr       1
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+## 3960 27264 Grouping and Chaining with dplyr       1
+## 3961 27264 Grouping and Chaining with dplyr       1
+## 3962 27264 Grouping and Chaining with dplyr       1
+## 3963 27264 Grouping and Chaining with dplyr       1
+## 3964 27264 Grouping and Chaining with dplyr       1
+## 3965 27264 Grouping and Chaining with dplyr       1
+## 3966 27264 Grouping and Chaining with dplyr       1
+## 3967 27264 Grouping and Chaining with dplyr       1
+## 3968 27264 Grouping and Chaining with dplyr       1
+## 3969 27264 Grouping and Chaining with dplyr       1
+## 3970 27264 Grouping and Chaining with dplyr       1
+## 3971 27264 Grouping and Chaining with dplyr       1
+## 3972 27264 Grouping and Chaining with dplyr       1
+## 3973 27264 Grouping and Chaining with dplyr       1
+## 3974 27264 Grouping and Chaining with dplyr       2
+## 3975 27264 Grouping and Chaining with dplyr       1
+## 3976 27264 Grouping and Chaining with dplyr       1
+## 3977 27264 Grouping and Chaining with dplyr       1
+## 3978 27264 Grouping and Chaining with dplyr       1
+## 3979 27264 Grouping and Chaining with dplyr       1
+## 3980 27264             Base_Plotting_System       1
+## 3981 27264             Base_Plotting_System       1
+## 3982 27264             Base_Plotting_System       1
+## 3983 27264             Base_Plotting_System       2
+## 3984 27264             Base_Plotting_System       1
+## 3985 27264             Base_Plotting_System       1
+## 3986 27264             Base_Plotting_System       2
+## 3987 27264             Base_Plotting_System       1
+## 3988 27264             Base_Plotting_System       1
+## 3989 27264             Base_Plotting_System       1
+## 3990 27264             Base_Plotting_System       1
+## 3991 27264             Base_Plotting_System       1
+## 3992 27264             Base_Plotting_System       1
+## 3993 27264             Base_Plotting_System       1
+## 3994 27264             Base_Plotting_System       1
+## 3995 27264             Base_Plotting_System       1
+## 3996 27264             Base_Plotting_System       1
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+## 4013 27264             Base_Plotting_System       1
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+## 4016 27264             Base_Plotting_System       1
+## 4017 27264             Base_Plotting_System       1
+## 4018 27264             Base_Plotting_System       1
+## 4019 27264             Base_Plotting_System       1
+## 4020 27264               Clustering_Example       1
+## 4021 27264               Clustering_Example       1
+## 4022 27264               Clustering_Example       1
+## 4023 27264               Clustering_Example       1
+## 4024 27264               Clustering_Example       1
+## 4025 27264               Clustering_Example       1
+## 4026 27264               Clustering_Example       1
+## 4027 27264               Clustering_Example       1
+## 4028 27264               Clustering_Example       1
+## 4029 27264               Clustering_Example       1
+## 4030 27264               Clustering_Example       1
+## 4031 27264               Clustering_Example       1
+## 4032 27264               Clustering_Example       1
+## 4033 27264               Clustering_Example       1
+## 4034 27264               Clustering_Example       1
+## 4035 27264               Clustering_Example       1
+## 4036 27264               Clustering_Example       1
+## 4037 27264               Clustering_Example       2
+## 4038 27264               Clustering_Example       1
+## 4039 27264             Base_Plotting_System       2
+## 4040 27264             Base_Plotting_System       1
+## 4041 27264             Base_Plotting_System       1
+## 4042 27264             Base_Plotting_System       2
+## 4043 27264             Base_Plotting_System       1
+## 4044 27264             Base_Plotting_System       1
+## 4045 27264             Base_Plotting_System       1
+## 4046 27264             Base_Plotting_System       1
+## 4047 27264             Base_Plotting_System       1
+## 4048 27264             Base_Plotting_System       1
+## 4049 27264             Base_Plotting_System       1
+## 4050 27264               Clustering_Example       1
+## 4051 27264               Clustering_Example       1
+## 4052 27264               Clustering_Example       1
+## 4053 27264               Clustering_Example       2
+## 4054 27264               Clustering_Example       1
+## 4055 27264               Clustering_Example       1
+## 4056 27264               Clustering_Example       2
+## 4057 27264               Clustering_Example       3
+## 4058 27264               Clustering_Example       1
+## 4059 27264               Clustering_Example       2
+## 4060 27264               Clustering_Example       1
+## 4061 27264               Clustering_Example       1
+## 4062 27264               Clustering_Example       1
+## 4063 27264               Clustering_Example       1
+## 4064 27264               Clustering_Example       1
+## 4065 27264               Clustering_Example       1
+## 4066 27264               Clustering_Example       1
+## 4067 27264               Clustering_Example       2
+## 4068 27264               Clustering_Example       1
+## 4069 27264               Clustering_Example       1
+## 4070 27264               Clustering_Example       1
+## 4071 27264               Clustering_Example       1
+## 4072 27264               Clustering_Example       1
+## 4073 27264               Clustering_Example       1
+## 4074 27264               Clustering_Example       1
+## 4075 27264               Clustering_Example       1
+## 4076 27264               Clustering_Example       1
+## 4077 27264               Clustering_Example       1
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+## 4079 94880            Basic Building Blocks       1
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+## 5358 24042                        Functions       1
+## 5359 24042                            Logic       1
+## 5360 24042                            Logic       1
+## 5361 24042                        Functions       1
+## 5362 24042                  Dates and Times       1
+## 5363 24042                        Functions       2
+## 5364 24042                        Functions       1
+## 5365 24042               Subsetting Vectors       1
+## 5366 24042                        Functions       1
+## 5367 24042                            Logic       1
+## 5368 24042                            Logic       1
+## 5369 24042                  Dates and Times       1
+## 5370 24042                        Functions       1
+## 5371 24042                        Functions      11
+## 5372 24042               Subsetting Vectors       1
+## 5373 24042                            Logic       1
+## 5374 24042                            Logic       1
+## 5375 24042                            Logic       1
+## 5376 24042                            Logic       1
+## 5377 24042               Subsetting Vectors       1
+## 5378 24042                            Logic       1
+## 5379 24042                        Functions       1
+## 5380 24042                            Logic       1
+## 5381 24042                            Logic       1
+## 5382 24042                            Logic       1
+## 5383 24042                  Dates and Times       1
+## 5384 24042                            Logic       1
+## 5385 24042                            Logic       1
+## 5386 64610            Basic Building Blocks       1
+## 5387 64610            Basic Building Blocks       1
+## 5388 64610            Basic Building Blocks       1
+## 5389 64610            Basic Building Blocks       1
+## 5390 64610            Basic Building Blocks       1
+## 5391 64610            Basic Building Blocks       1
+## 5392 64610            Basic Building Blocks       1
+## 5393 64610            Basic Building Blocks       1
+## 5394 64610            Basic Building Blocks       1
+## 5395 64610            Basic Building Blocks       1
+## 5396 64610            Basic Building Blocks       1
+## 5397 64610            Basic Building Blocks       1
+## 5398 64610            Basic Building Blocks       1
+## 5399 64610            Basic Building Blocks       1
+## 5400 64610            Basic Building Blocks       1
+## 5401 64610            Basic Building Blocks       1
+## 5402 64610            Basic Building Blocks       1
+## 5403 64610            Basic Building Blocks       1
+## 5404 64610            Basic Building Blocks       1
+## 5405 64610            Basic Building Blocks       1
+## 5406 64610            Basic Building Blocks       1
+## 5407 64610            Basic Building Blocks       1
+## 5408 64610            Basic Building Blocks       2
+## 5409 64610            Basic Building Blocks       1
+## 5410 34362              Workspace and Files       1
+## 5411 34362                            Logic       2
+## 5412 34362              Workspace and Files       2
+## 5413 34362              Workspace and Files       1
+## 5414 34362              Workspace and Files       2
+## 5415 34362              Workspace and Files       1
+## 5416 34362              Workspace and Files       1
+## 5417 34362                            Logic       1
+## 5418 34362                            Logic       2
+## 5419 34362                            Logic       3
+## 5420 34362              Workspace and Files       1
+## 5421 34362                            Logic       1
+## 5422 34362                        Functions       1
+## 5423 34362                            Logic       1
+## 5424 34362                            Logic       1
+## 5425 34362              Workspace and Files       1
+## 5426 34362              Workspace and Files       3
+## 5427 34362              Workspace and Files       1
+## 5428 34362              Workspace and Files       1
+## 5429 34362              Workspace and Files       2
+## 5430 34362              Workspace and Files       1
+## 5431 34362              Workspace and Files       1
+## 5432 34362              Workspace and Files       1
+## 5433 34362              Workspace and Files       1
+## 5434 34362              Workspace and Files       2
+## 5435 34362              Workspace and Files       1
+## 5436 34362              Workspace and Files       1
+## 5437 34362              Workspace and Files       1
+## 5438 34362              Workspace and Files       1
+## 5439 34362                        Functions       7
+## 5440 34362                        Functions       8
+## 5441 34362                        Functions       1
+## 5442 34362                        Functions       2
+## 5443 34362                        Functions       1
+## 5444 34362                        Functions       1
+## 5445 34362                        Functions       2
+## 5446 34362                        Functions       3
+## 5447 34362                        Functions       4
+## 5448 34362              Workspace and Files       1
+## 5449 34362              Workspace and Files       1
+## 5450 34362                  Dates and Times       1
+## 5451 34362                  Dates and Times       1
+## 5452 34362                  Dates and Times       1
+## 5453 34362                  Dates and Times       1
+## 5454 34362                  Dates and Times       1
+## 5455 34362                  Dates and Times       2
+## 5456 34362                  Dates and Times       1
+## 5457 34362                  Dates and Times       1
+## 5458 34362                  Dates and Times       1
+## 5459 34362                  Dates and Times       1
+## 5460 34362                  Dates and Times       1
+## 5461 34362                  Dates and Times       1
+## 5462 34362                  Dates and Times       1
+## 5463 34362                        Functions       1
+## 5464 34362                        Functions       1
+## 5465 34362                        Functions       2
+## 5466 34362                        Functions       1
+## 5467 34362                        Functions       1
+## 5468 34362                        Functions       1
+## 5469 34362                        Functions       1
+## 5470 34362                        Functions       1
+## 5471 34362                        Functions       1
+## 5472 34362                        Functions       1
+## 5473 34362                        Functions       1
+## 5474 34362                        Functions       2
+## 5475 34362                        Functions       3
+## 5476 34362                        Functions       4
+## 5477 34362                        Functions       5
+## 5478 34362                        Functions       6
+## 5479 34362                            Logic       1
+## 5480 34362                            Logic       1
+## 5481 34362                            Logic       1
+## 5482 34362                            Logic       1
+## 5483 34362                            Logic       1
+## 5484 34362                            Logic       1
+## 5485 34362               Subsetting Vectors       1
+## 5486 34362               Subsetting Vectors       1
+## 5487 34362               Subsetting Vectors       1
+## 5488 34362               Subsetting Vectors       2
+## 5489 34362               Subsetting Vectors       1
+## 5490 34362               Subsetting Vectors       1
+## 5491 34362               Subsetting Vectors       1
+## 5492 34362                            Logic       1
+## 5493 34362                            Logic       1
+## 5494 34362                            Logic       1
+## 5495 34362                            Logic       1
+## 5496 34362                            Logic       1
+## 5497 34362                            Logic       2
+## 5498 34362                            Logic       1
+## 5499 34362                            Logic       1
+## 5500 34362                            Logic       1
+## 5501 34362                            Logic       1
+## 5502 34362                   Missing Values       1
+## 5503 34362                   Missing Values       1
+## 5504 34362                   Missing Values       1
+## 5505 34362                   Missing Values       1
+## 5506 34362                   Missing Values       1
+## 5507 34362               Subsetting Vectors       1
+## 5508 34362               Subsetting Vectors       1
+## 5509 34362               Subsetting Vectors       1
+## 5510 34362               Subsetting Vectors       1
+## 5511 34362               Subsetting Vectors       1
+## 5512 34362               Subsetting Vectors       1
+## 5513 34362               Subsetting Vectors       1
+## 5514 34362               Subsetting Vectors       1
+## 5515 34362               Subsetting Vectors       1
+## 5516 34362               Subsetting Vectors       1
+## 5517 34362               Subsetting Vectors       1
+## 5518 34362               Subsetting Vectors       2
+## 5519 34362               Subsetting Vectors       3
+## 5520 34362               Subsetting Vectors       4
+## 5521 34362               Subsetting Vectors       1
+## 5522 34362               Subsetting Vectors       1
+## 5523 34362               Subsetting Vectors       2
+## 5524 34362               Subsetting Vectors       1
+## 5525 34362                          Vectors       1
+## 5526 34362                          Vectors       2
+## 5527 34362                          Vectors       3
+## 5528 34362                          Vectors       4
+## 5529 34362                          Vectors       1
+## 5530 34362                          Vectors       1
+## 5531 34362                          Vectors       1
+## 5532 34362               Subsetting Vectors       1
+## 5533 34362               Subsetting Vectors       2
+## 5534 34362               Subsetting Vectors       1
+## 5535 34362               Subsetting Vectors       1
+## 5536 34362               Subsetting Vectors       2
+## 5537 34362               Subsetting Vectors       1
+## 5538 34362               Subsetting Vectors       1
+## 5539 34362               Subsetting Vectors       1
+## 5540 34362               Subsetting Vectors       1
+## 5541 34362                            Logic       1
+## 5542 34362                            Logic       1
+## 5543 34362                            Logic       2
+## 5544 34362                            Logic       1
+## 5545 34362                            Logic       1
+## 5546 34362                            Logic       1
+## 5547 34362                            Logic       1
+## 5548 34362                            Logic       1
+## 5549 34362                            Logic       1
+## 5550 34362                            Logic       1
+## 5551 34362                            Logic       2
+## 5552 34362                            Logic       3
+## 5553 34362                            Logic       1
+## 5554 34362                            Logic       1
+## 5555 34362                            Logic       1
+## 5556 34362                            Logic       1
+## 5557 34362                            Logic       1
+## 5558 34362                            Logic       1
+## 5559 34362                            Logic       1
+## 5560 34362                          Vectors       2
+## 5561 34362                          Vectors       3
+## 5562 34362                          Vectors       4
+## 5563 34362                          Vectors       1
+## 5564 34362                          Vectors       2
+## 5565 34362                  Dates and Times       1
+## 5566 34362                  Dates and Times       1
+## 5567 34362                  Dates and Times       1
+## 5568 34362                  Dates and Times       1
+## 5569 34362                  Dates and Times       1
+## 5570 34362                  Dates and Times       1
+## 5571 34362                  Dates and Times       2
+## 5572 34362                          Vectors       1
+## 5573 34362                   Missing Values       1
+## 5574 34362                   Missing Values       1
+## 5575 34362                   Missing Values       1
+## 5576 34362                   Missing Values       1
+## 5577 34362                   Missing Values       1
+## 5578 34362                   Missing Values       1
+## 5579 34362                   Missing Values       1
+## 5580 34362                   Missing Values       1
+## 5581 34362                   Missing Values       1
+## 5582 34362                   Missing Values       1
+## 5583 34362              Workspace and Files       1
+## 5584 34362                          Vectors       1
+## 5585 34362                          Vectors       1
+## 5586 34362                          Vectors       1
+## 5587 34362                          Vectors       1
+## 5588 34362                          Vectors       1
+## 5589 34362                          Vectors       1
+## 5590 34362                          Vectors       1
+## 5591 34362                          Vectors       1
+## 5592 34362                          Vectors       1
+## 5593 34362                          Vectors       2
+## 5594 34362                          Vectors       1
+## 5595 34362                          Vectors       1
+## 5596 34362                          Vectors       1
+## 5597 34362                          Vectors       2
+## 5598 34362                          Vectors       1
+## 5599 34362                          Vectors       1
+## 5600 34362              Workspace and Files       1
+## 5601 34362              Workspace and Files       1
+## 5602 34362              Workspace and Files       1
+## 5603 34362              Workspace and Files       1
+## 5604 34362              Workspace and Files       2
+## 5605 34362            Basic Building Blocks       1
+## 5606 34362            Basic Building Blocks       1
+## 5607 34362            Basic Building Blocks       1
+## 5608 34362            Basic Building Blocks       1
+## 5609 34362            Basic Building Blocks       1
+## 5610 34362            Basic Building Blocks       1
+## 5611 34362            Basic Building Blocks       1
+## 5612 34362                  Dates and Times       1
+## 5613 34362                  Dates and Times       2
+## 5614 34362                        Functions       3
+## 5615 34362                        Functions       4
+## 5616 34362                        Functions       1
+## 5617 34362                        Functions       2
+## 5618 34362                        Functions       1
+## 5619 34362                        Functions       1
+## 5620 34362                        Functions       2
+## 5621 34362                        Functions       1
+## 5622 34362                        Functions       1
+## 5623 34362                        Functions       2
+## 5624 34362              Workspace and Files       1
+## 5625 34362              Workspace and Files       1
+## 5626 34362              Workspace and Files       1
+## 5627 34362              Workspace and Files       1
+## 5628 34362              Workspace and Files       1
+## 5629 34362              Workspace and Files       2
+## 5630 34362              Workspace and Files       1
+## 5631 34362              Workspace and Files       2
+## 5632 34362              Workspace and Files       1
+## 5633 34362              Workspace and Files       1
+## 5634 34362              Workspace and Files       1
+## 5635 34362              Workspace and Files       1
+## 5636 34362              Workspace and Files       1
+## 5637 34362              Workspace and Files       1
+## 5638 34362              Workspace and Files       1
+## 5639 34362              Workspace and Files       2
+## 5640 34362            Basic Building Blocks       1
+## 5641 34362            Basic Building Blocks       1
+## 5642 34362            Basic Building Blocks       1
+## 5643 34362            Basic Building Blocks       1
+## 5644 34362            Basic Building Blocks       1
+## 5645 34362            Basic Building Blocks       1
+## 5646 34362              Workspace and Files       1
+## 5647 34362              Workspace and Files       1
+## 5648 34362              Workspace and Files       1
+## 5649 34362              Workspace and Files       2
+## 5650 34362              Workspace and Files       1
+## 5651 34362              Workspace and Files       2
+## 5652 34362            Basic Building Blocks       1
+## 5653 34362                        Functions       1
+## 5654 34362                  Dates and Times       1
+## 5655 34362                  Dates and Times       1
+## 5656 34362            Basic Building Blocks       1
+## 5657 34362            Basic Building Blocks       1
+## 5658 34362                  Dates and Times       1
+## 5659 34362            Basic Building Blocks       1
+## 5660 34362            Basic Building Blocks       1
+## 5661 34362            Basic Building Blocks       1
+## 5662 34362            Basic Building Blocks       1
+## 5663 34362            Basic Building Blocks       1
+## 5664 34362                        Functions       3
+## 5665 34362                        Functions       4
+## 5666 34362              Workspace and Files       1
+## 5667 34362              Workspace and Files       1
+## 5668 34362              Workspace and Files       1
+## 5669 34362                  Dates and Times       2
+## 5670 34362                  Dates and Times       1
+## 5671 34362              Workspace and Files       1
+## 5672 34362                  Dates and Times       1
+## 5673 34362                  Dates and Times       1
+## 5674 34362                  Dates and Times       1
+## 5675 34362                  Dates and Times       1
+## 5676 34362                  Dates and Times       1
+## 5677 34362                  Dates and Times       1
+## 5678 34362            Basic Building Blocks       1
+## 5679 34362                            Logic       1
+## 5680 34362              Workspace and Files       1
+## 5681 34362              Workspace and Files       1
+## 5682 34362                        Functions       2
+## 5683 34362              Workspace and Files       1
+## 5684 34362                        Functions       2
+## 5685 34362                        Functions       2
+## 5686 34362                        Functions       3
+## 5687 34362                        Functions       4
+## 5688 34362                        Functions       5
+## 5689 34362                        Functions       1
+## 5690 34362                        Functions       1
+## 5691 34362                        Functions       1
+## 5692 34362                        Functions       1
+## 5693 34362            Basic Building Blocks       1
+## 5694 34362                        Functions       1
+## 5695 34362              Workspace and Files       1
+## 5696 34362                        Functions       1
+## 5697 34362                        Functions       1
+## 5698 34362                        Functions       1
+## 5699 34362                        Functions       1
+## 5700 35235            Basic Building Blocks       1
+## 5701 35235            Basic Building Blocks       1
+## 5702 35235            Basic Building Blocks       1
+## 5703 35235            Basic Building Blocks       1
+## 5704 35235            Basic Building Blocks       1
+## 5705 35235            Basic Building Blocks       1
+## 5706 35235            Basic Building Blocks       1
+## 5707 35235            Basic Building Blocks       1
+## 5708 35235            Basic Building Blocks       2
+## 5709 35235            Basic Building Blocks       1
+## 5710 35235            Basic Building Blocks       1
+## 5711 35235            Basic Building Blocks       1
+## 5712 35235            Basic Building Blocks       1
+## 5713 35235            Basic Building Blocks       1
+## 5714 35235            Basic Building Blocks       1
+## 5715 35235            Basic Building Blocks       1
+## 5716 35235            Basic Building Blocks       1
+## 5717 35235            Basic Building Blocks       1
+## 5718 35235            Basic Building Blocks       1
+## 5719 35235            Basic Building Blocks       2
+## 5720 35235            Basic Building Blocks       1
+## 5721 35235            Basic Building Blocks       1
+## 5722 35235            Basic Building Blocks       2
+## 5723 35235            Basic Building Blocks       1
+## 5724 35235            Basic Building Blocks       1
+## 5725 35235            Basic Building Blocks       1
+
    +
  1. Use the group_by function to create a data frame that sums all the attempts for each hash by each lesson_name called DF3
  2. +
+
library(dplyr)
+DF3 <- DF2 %>% group_by(hash, lesson_name) %>% summarise(sum = sum(attempt))
+
## `summarise()` regrouping output by 'hash' (override with `.groups` argument)
+
DF3
+
## # A tibble: 226 x 3
+## # Groups:   hash [41]
+##     hash lesson_name                sum
+##    <int> <chr>                    <int>
+##  1  2864 Basic Building Blocks       29
+##  2  4807 Basic Building Blocks       49
+##  3  4807 Dates and Times             51
+##  4  4807 Logic                      116
+##  5  4807 Matrices and Data Frames    43
+##  6  4807 Missing Values              19
+##  7  4807 Subsetting Vectors          35
+##  8  4807 Vectors                     35
+##  9  4807 Workspace and Files         39
+## 10  6487 Basic Building Blocks       25
+## # … with 216 more rows
+
    +
  1. On a scrap piece of paper draw what you think DF3 would look like if all the lesson names were column names script

  2. +
  3. Convert DF3 to this format

  4. +
+
library(tidyr)
+script <- spread(DF3, lesson_name, sum, fill = NA, convert = FALSE)
+
## Warning: The `x` argument of `as_tibble.matrix()` must have unique column names if `.name_repair` is omitted as of tibble 2.0.0.
+## Using compatibility `.name_repair`.
+## This warning is displayed once every 8 hours.
+## Call `lifecycle::last_warnings()` to see where this warning was generated.
+
    +
  1. Create a new data frame from DF1 called DF4 that only includes the variables hash, lesson_name and correct
  2. +
+
library(dplyr)
+DF4 <- select(DF1, hash, lesson_name, correct)
+
    +
  1. Convert the correct variable so that TRUE is coded as the number 1 and FALSE is coded as 0
  2. +
+
DF4$correct <- ifelse(DF4$correct == "FALSE", 0, 1)
+
    +
  1. Create a new data frame called DF5 that provides a mean score for each student on each course
  2. +
+
library(dplyr)
+course_name <- DF1[,1]
+DF5 <- bind_cols(DF4, course_name)
+
## New names:
+## * NA -> ...4
+
DF5 %>% group_by(hash, ...4) %>% summarise(mean = mean(correct))
+
## `summarise()` regrouping output by 'hash' (override with `.groups` argument)
+
## # A tibble: 66 x 3
+## # Groups:   hash [41]
+##     hash ...4                       mean
+##    <int> <chr>                     <dbl>
+##  1  2864 R Programming                NA
+##  2  4807 R Programming                NA
+##  3  6487 R Programming                NA
+##  4  8766 R Programming                NA
+##  5 11801 Getting and Cleaning Data    NA
+##  6 11801 R Pro                        NA
+##  7 11801 R Programming                NA
+##  8 12264 Getting and Cleaning Data    NA
+##  9 12264 R Programming                NA
+## 10 14748 R Programming                NA
+## # … with 56 more rows
+
    +
  1. Extra credit Convert the datetime variable into month-day-year format and create a new data frame (DF6) that shows the average correct for each day
  2. +
+

Finally use the knitr function to generate an html document from your work. Commit, Push and Pull Request your work back to the main branch of the repository. Make sure you include both the .Rmd file and the .html file.

+
+
+
+ + + + +
+ + + + + + + + + + + + + + +