NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

A Note on Adapting Propensity Score Matching and Selection Models to Choice Based Samples

James J. Heckman, Petra E. Todd

NBER Working Paper No. 15179
Issued in July 2009

---- Acknowledgements -----

This research was supported by NSF SBR 93-21-048 and NSF 97-09-873 and NICHD 40-4043-000-85-261. 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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