NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Moving the Goalposts: Addressing Limited Overlap in the Estimation of Average Treatment Effects by Changing the Estimand

Richard K. Crump, V. Joseph Hotz, Guido W. Imbens, Oscar A. Mitnik

NBER Technical Working Paper No. 330
Issued in October 2006

---- Acknowledgements -----

We are grateful for helpful comments by Richard Blundell, Gary Chamberlain, Jinyong Hahn, Gary King, Michael Lechner, Robert Moffitt, Geert Ridder and Don Rubin, and by participants in seminars at the ASSA meetings in Philadelphia, University College London, UCLA, UC--Berkeley, UC--Riverside, MIT--Harvard, Johns Hopkins University, the Malinvaud seminar at CREST, and the IAB Empirical Evaluation of Labour Market Programmes conference. Imbens and Holtz acknowledge financial support from the National Science Foundation under grants SES 0452590 and SES 0339051 respestively. The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.

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