NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Dummy Endogenous Variables in a Simultaneous Equation System

James J. Heckman

NBER Working Paper No. 177
Issued in May 1977

---- Acknowledgements -----

This research was supported by NSF and ASPER Department of Labor grants to the National Bureau of Economic Research. Takeshi Ainemiya, R. Bahadur, Linda Edwards Zvi Griliches, Tom MaCurdy, Marc Nerlove, Randy Olsen, Donald Sant, Peter Schmidt and Arnold Zellner all made valuable comments on drafts of this paper. I assume all responsibility for any remaining errors. The first draft of this paper appeared under the same title as an unpublished NEER paper in April 1973. A second draft was circulated under a different title and presented at the World Econometric Society Meetings at Toronto, 1975.

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