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feat(duration-did): add DurationDiD estimator (Deaner & Ku 2026 causal duration DiD)
#2730
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feat(duration-did): add DurationDiD estimator (Deaner & Ku 2026 causal duration DiD)
feat(duration-did): add DurationDiD estimator (Deaner & Ku 2026 causal duration DiD)
#2730
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