Sample selection bias as a specification error
JJ Heckman - Econometrica: Journal of the econometric society, 1979 - JSTOR
Econometrica: Journal of the econometric society, 1979•JSTOR
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.
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.
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.
JSTOR