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Sample Selection Bias as a Specification Error

James J. Heckman
Econometrica
Vol. 47, No. 1 (Jan., 1979), pp. 153-161
Published by: The Econometric Society
DOI: 10.2307/1912352
Stable URL: http://www.jstor.org/stable/1912352
Page Count: 9
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Sample Selection Bias as a Specification Error
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Abstract

This paper discusses the bias that results from using nonrandomly selected samples to estimate behavioral relationships as an ordinary specification error or "omitted variables" bias. A simple consistent two stage estimator is considered that enables analysts to utilize simple regression methods to estimate behavioral functions by least squares methods. The asymptotic distribution of the estimator is derived.

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