Regression Discontinuity Designs: A Guide to Practice
---- Acknowledgments ----
This paper was prepared as an introduction to a special issue of the Journal of Econometrics on regression discontinuity designs. We are grateful for discussions with David Card and Wilbert van der Klaauw. Financial support for this research was generously provided through NSF grant SES 0452590 and the SSHRC of Canada. The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.