NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Weighting for External Validity

Isaiah Andrews, Emily Oster

NBER Working Paper No. 23826
Issued in September 2017, Revised in January 2018

---- Acknowledgments ----

Sophie Sun provided excellent research assistance. We thank Nick Bloom, Guido Imbens, Matthew Gentzkow, Peter Hull, Larry Katz, Ben Olken, Jesse Shapiro, Andrei Shleifer and participants in seminars at Brown University, Harvard University and University of Connecticut for helpful comments. Andrews gratefully acknowledges support from the Silverman (1978) Family Career Development chair at MIT, and from the National Science Foundation under grant number 1654234. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.

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