Design-based Analysis in Difference-In-Differences Settings with Staggered Adoption
---- Acknowledgments ----
We are grateful for comments by participations in the conference in honor of Gary Chamberlain at Harvard in May 2018, and in particular by Gary Chamberlain. Gary's insights over the years have greatly affected our thinking on these problems. We also wish to thank Sylvia Kloskin and Michael Pollmann for superb research assistance. This research was generously supported by ONR grant N00014-17-1-2131. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.
---- Disclosure of Financial Relationships for Susan Athey ----
Susan Athey serves on the boards of directors of Expedia (EXPE), Lending Club (LC), Rover, Ripple, and CoinCenter. She also advises venture capital firms X/Seed Capital and NYCA Partners.
---- Disclosure of Financial Relationships for Guido W. Imbens ----
I have consulted for Microsoft Corporation, Facebook, Amazon, and Lilly Corporation.