On Fri, 21 Jun 2013, Henrique Andrade wrote: You know, I didn't remember this at all, but now that I look at it again, I think it'd make a nice function package. If someone volunteers, I promise I'll do my best to help (I'll be online rather intermittently for a few days). ------------------------------------------------------- Riccardo (Jack) Lucchetti Dipartimento di Scienze Economiche e Sociali (DiSES) Università Politecnica delle Marche (formerly known as Università di Ancona) r.lucchetti(a)univpm.it http://www2.econ.univpm.it/servizi/hpp/lucchetti -------------------------------------------------------