Notes, Comments and Preliminary results Apr 15 2009 José de Hevia and María Arrazola   Marginal effects in the double selection regression model: an illustration for the wages of women in Spain   Abstract  Contact Information  Citation  Full Text  -  Note   Mar 19 2007 José de Hevia and María Arrazola   AN AGGREGATED INDEX OF HUMAN CAPITAL   Abstract  Contact Information  Citation  Full Text  -  Note