[Gretl-users] Number of valid observations.

Dear Gretl Useres! I've 30 variables and want to generate vector n with number of valid observations for each variable. I'm using 'ok' function but something is wrong (see script below). Probably '$i' is not taken as a i-th variable but as a series containg only "i". What do you think about it? How to be sure that '$i' is taken as a i-th variable? <hansl> n=zeros(30,1) loop i=1..30 a=sum(ok($i)) n[i,1]=a endloop print n Regards, Mariusz -- Mariusz Doszyń