The authors derive closed-form efficient influence functions for DiD and event study parameters under parallel trends, yielding estimators that achieve the smallest possible asymptotic variance.
Difference-in-differences with variation in treatment timing,
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Efficient Difference-in-Differences and Event Study Estimators
The authors derive closed-form efficient influence functions for DiD and event study parameters under parallel trends, yielding estimators that achieve the smallest possible asymptotic variance.