Balancing, Regression, Difference-In-Differences and Synthetic Control Methods: A Synthesis
---- Acknowledgments ----
We are grateful for comments by seminar participants at the California Econometrics Conference. 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 Guido W. Imbens ----
I have consulted for Microsoft Corporation, Facebook, Amazon, and Lilly Corporation.