Re: [Gretl-users] problem concerning dummies

Hi Jack, thanks for your help! I'm was experimenting with loop commands for each element of the 'dataset matrix' but the code soon got too 'long'. The unpacking of the list in conjunction with the dummify command is super - hansl impresses me more and more. Have a nice day Leon Am 28.05.2012 17:35, schrieb Riccardo (Jack) Lucchetti: On Mon, 28 May 2012, Paolo Caliò wrote: Hello! I need to create some dummy variables in order to capture all the possible combinations of a certain set of variables. [...] Does this help? <hansl> function list CombinDums(list X) scalar pwr = 1 series category = 0 loop foreach i X --quiet category += pwr * (X.$i>0) pwr *= 2 end loop list ret = dummify(category) return ret end function nulldata 32 set seed 1234 series a = normal() series b = normal() series c = normal() list X = a b c list D = CombinDums(X) </hansl> -------------------------------------------------- Riccardo (Jack) Lucchetti Dipartimento di Economia Università Politecnica delle Marche (formerly known as Università di Ancona) r.lucchetti(a)univpm.it http://www2.econ.univpm.it/servizi/hpp/lucchetti -------------------------------------------------- _______________________________________________ Gretl-users mailing listGretl-users@lists.wfu.eduhttp://lists.wfu.edu/mailman/listinfo/gretl-users _______________________________________________ Gretl-users mailing list Gretl-users(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-users