Use this identifier to quote or link this document: http://hdl.handle.net/2072/1813

Parametric and semiparametric estimation of sample selection models: an empirical application to the female labour force in Portugal
Coelho, Danilo; Veiga, Helena; Ferenc, Veszteg Róbert
Universitat Autònoma de Barcelona. Unitat de Fonaments de l'Anàlisi Econòmica; Institut d'Anàlisi Econòmica
This comment corrects the errors in the estimation process that appear in Martins (2001). The first error is in the parametric probit estimation, as the previously presented results do not maximize the log-likelihood function. In the global maximum more variables become significant. As for the semiparametric estimation method, the kernel function used in Martins (2001) can take on both positive and negative values, which implies that the participation probability estimates may be outside the interval [0,1]. We have solved the problem by applying local smoothing in the kernel estimation, as suggested by Klein and Spady (1993).
2006-05-09
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Working Paper
Working papers; 636.05
         

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