Refactor estimators.py to reduce module size#39
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Split large estimators.py (~1812 lines) into smaller focused modules: - estimators.py (~975 lines): DifferenceInDifferences, MultiPeriodDiD - twfe.py (~355 lines): TwoWayFixedEffects - synthetic_did.py (~540 lines): SyntheticDiD Backward compatibility maintained via re-exports from estimators.py. All 100 estimator tests pass. Updated CLAUDE.md and TODO.md.
- README.md: Use `from diff_diff import TwoWayFixedEffects` (preferred) - docs/api/estimators.rst: Document new module structure (twfe.py, synthetic_did.py) with backward-compatible import instructions
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Split large estimators.py (~1812 lines) into smaller focused modules:
Backward compatibility maintained via re-exports from estimators.py.
All 100 estimator tests pass. Updated CLAUDE.md and TODO.md.