Harvesting Differences-in-Differences and Event-Study Evidence

Alberto Abadie, Joshua Angrist, Brigham Frandsen and Jorn-Steffen Pischke

No 34550, NBER Working Papers from National Bureau of Economic Research, Inc

Abstract: This paper surveys econometric innovations related to differences-in-differences estimators and event-study models with time-varying treatment effects. Our discussion highlights tricky normalization issues, heterogeneous policy effects, the interpretation of exposure designs, pretrends pretesting, and the ever-bothersome question of logs versus levels. Key ideas are illustrated with applications.

JEL-codes: C23 C5 (search for similar items in EconPapers)
Date: 2025-12
Note: CH ED EH LE LS PE POL TWP
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