Difference-in-differences with variation in treatment timing

Abstract

nber working paper series difference-in-differences with variation in treatment timing andrew goodman-bacon working paper 25018 www.nber.org/papers/w25018 national bureau of economic research 1050 massachusetts avenue cambridge, ma 02138 september 2018 i thank michael anderson, martha bailey, marianne bitler, brantly callaway, kitt carpenter, eric chyn, bill collins, john dinardo, andrew dustan, federico gutierrez, brian kovak, emily lawler, doug miller, sayeh nikpay, pedro sant’anna, jesse shapiro, gary solon, isaac sorkin, sarah west, and seminar participants at the southern economics association, ashecon 2018, the university of california, davis, university of kentucky, university of memphis, university of north carolina charlotte, the university of pennsylvania, and vanderbilt university. all errors are my own. the views expressed herein are those of the author and do not necessarily reflect the views of the national bureau of economic research. nber working papers are circulated for discussion and comment purposes. they have not been peer-reviewed or been subject to the review by the nber board of directors that accompanies official nber publications. © 2018 by andrew goodman-bacon. all rights reserved. short sections of text, not to exceed two paragraphs, may be quoted without explicit permission provided that full credit, including © notice, is given to the source. difference-in-differences with variation in treatment timing andrew goodman-bacon nber working paper no. …

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