Site Selection Bias in Program Evaluation
NBER Working Paper No. 18373
---- Acknowledgments ----
This paper replaces an earlier version which was titled "External Validity and Partner Selection Bias." The earlier draft was jointly authored with Sendhil Mullainathan, and the project benefited substantially from his insight and collaboration. I thank Josh Angrist, Amitabh Chandra, Lucas Davis, Kyle Dropp, Meredith Fowlie, Xavier Gine, Chuck Goldman, Matt Harding, Joe Hotz, Guido Imbens, Larry Katz, Chris Knittel, Dan Levy, Jens Ludwig, Konrad Menzel, Emily Oster, Rohini Pande, Todd Rogers, Piyush Tantia, Ed Vytlacil, Heidi Williams, five anonymous referees, and seminar participants at the ASSA meetings, Berkeley, Columbia, Harvard, MIT, NBER Labor Studies, NBER Energy and Environmental Economics, NEUDC, the UCSB/UCLA Conference on Field Experiments, and the World Bank for insights and helpful advice. Thanks also to Tyler Curtis, Marc Laitin, Alex Laskey, Alessandro Orfei, Nate Srinivas, Dan Yates, and others at Opower for fruitful discussions. Christina Larkin provided timely research assistance. I am grateful to the Sloan Foundation for financial support of this paper and related research on the economics of energy efficiency. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.