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Consistency of Heckman-type two-step estimators for the multivariate sample-selection model

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Abstract:

This analysis shows that multivariate generalizations to the classical Heckman (1976, 1979) two-step estimator that account for cross-equation correlation and use the inverse Mills ratio as correction term are consistent only if certain restrictions apply to the true error-covariance structure. An alternative class of generalizations to the classical Heckman two-step approach is derived that condition on the entire selection pattern rather than selection in particular equations and, therefore, use modified correction terms. It is shown that this class of estimators is consistent. In addition, Monte-Carlo results illustrate that these estimators display a smaller mean square prediction error.

Document Type: Research Article

DOI: https://doi.org/10.1080/00036840802360179

Affiliations: RWI Essen, Essen D-45128, Germany

Publication date: 2010-12-01

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