Tsakas, EliasAkay, Alpaslan2006-12-192007-02-092007-02-0920061403-2465http://hdl.handle.net/2077/2667In this paper we discuss the differences between the average marginal effect and the marginal effect of the average individual in sample selection models, estimated by Heckman's two step procedure. We show that the bias that emerges as a consequence of interchanging them, could be very signifcant, even in the limit. We suggest a computationally cheap approximation method, which corrects the bias in a large extent. We illustrate the implications of our method with an empirical application of earnings assimilation and a small Monte Carlo simulation.16 pages238888 bytesapplication/pdfenHeckman's two step estimatoraverage marginal effectmarginal effect of the average individual; earnings assimilationReportEconomics