Abstract
Estimating Marginal Treatment Effectsin Heterogeneous PopulationsRobert MoffittJohns Hopkins UniversityDecember, 2006Revised, October, 2007The author would like to thank Marc Chan for research assistance and Lorraine Dearden forgenerous help in obtaining and using the data. Comments from Joshua Angrist, JamesHeckman, Guido Imbens, Matthew White, Tiemen Woutersen, and participants at workshops atseveral universities, research institutes, and conferences are appreciated, as well as commentsfrom two anonymous referees, Thierry Magnac, and other participants at the Conference onEconometric Evaluation of Public Policies: Methods and Applications,” Paris, December, 2005on an earlier closely related paper. The author also thanks Steffen Reinhold for correcting twoerrors in the Appendix. Research support from the National Institute of Child Health and HumanDevelopment is gratefully acknowledged. welfls0_v4.wpd10/3/07
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