Dear all, a new package is available on the server: stat_match. It allows gretl users to apply two methods of statistical matching, radius and one-to-one methods, using both the propensity score and the mahalanobis distance. I will be grateful to all those who send me suggestions to improve it or point out any bugs. Cheers, Paolo -- Paolo Chirico RU e Prof.Agg. di Statistica Economica Università del Piemonte Orientale Dip. di Giurisprudenza e Scienze Politiche, Economiche e Sociali (DIGSPES) Alessandria, Italia