On the Validity of the Regression Discontinuity Design for Estimating Electoral Effects: New Evidence from over 40,000 Close Races
London School of Economics
University of Chicago - Irving B. Harris Graduate School of Public Policy Studies
Stanford University - Department of Political Science; Stanford Graduate School of Business
Andrew B. Hall
Harvard University - Department of Government
James M. Snyder Jr.
American Journal of Political Science (Forthcoming)
Formerly MIT Political Science Department Working Paper Series No 2013-26
The regression discontinuity (RD) design is a valuable tool for identifying electoral effects, but this design is only effective when relevant actors do not have precise control over election results. Several recent papers contend that such precise control is possible in large elections, pointing out that the incumbent party is more likely to win very close elections in the U.S. House of Representatives in recent periods. In this paper, we examine whether similar patterns occur in other electoral settings, including the U.S. House in other time periods, statewide, state legislative, and mayoral races in the U.S., and national or local elections in a variety of other countries. No other case exhibits this pattern. We also cast doubt on suggested explanations for incumbent success in close House races. We conclude that the assumptions behind the RD design are likely to be met in a wide variety of electoral settings and offer a set of best practices for RD researchers going forward.
Number of Pages in PDF File: 47
Keywords: regression discontinuity, election, causal inference
JEL Classification: C14; C21
Date posted: May 16, 2013 ; Last revised: March 16, 2014
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