On Tue, 13 Nov 2012, Mariusz Doszyń wrote: For a start, you may want to use the version nobs(), but that's very marginal. In order to do what you want, you have to supply the name of the series to the function, not its number: you may do so in (at least) two ways. Method 1: <hansl> open AWM.gdt list L = CAN .. EER n = zeros(nelem(L),1) j = 1 loop foreach i L --quiet n[j] = nobs($i) j++ end loop print n </hansl> Method 2: <hansl> open AWM.gdt n = zeros(20,1) loop i=1..20 --quiet s = varname(i) n[j] = nobs(@s) end loop print n </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 --------------------------------------------------