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- W2791859701 abstract "The canonical difference-in-differences (DD) estimator contains two time periods, ”pre” and ”post”, and two groups, ”treatment” and ”control”. Most DD applications, however, exploit variation across groups of units that receive treatment at different times. This paper shows that the two-way fixed effects estimator equals a weighted average of all possible two-group/two-period DD estimators in the data. A causal interpretation of two-way fixed effects DD estimates requires both a parallel trends assumption and treatment effects that are constant over time. I show how to decompose the difference between two specifications, and provide a new analysis of models that include time-varying controls." @default.
- W2791859701 created "2018-03-29" @default.
- W2791859701 creator A5031283997 @default.
- W2791859701 date "2021-12-01" @default.
- W2791859701 modified "2023-10-17" @default.
- W2791859701 title "Difference-in-differences with variation in treatment timing" @default.
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- W2791859701 doi "https://doi.org/10.1016/j.jeconom.2021.03.014" @default.
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