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