Hi - first time poster here so will try my best to describe the problem I am facing. Also fairly newish to SAS.   I have a number of variables all in one data set called: Coefficient_t0 Coefficient_t1 Coefficient_t2  Coefficient_t3 etc up to a large number of coefficients (~100).   I would like to somehow rename these to  Jun18 July18 August18 Spetember 18 etc...   I was hoping to loop over the values of t0, t1, t2 and assign each = intnx('month',Start_Date,i,"BEGINNING") this way each value of i should be a new month.   Something like:   %let nvars=20;   %macro doit;   data Maturity_Coeffient_all_t_date; set Maturity_Coeffient_all_t;   %do i = 1 %to &nvars.; rename Coefficient_t&i. = intnx('month',Start_Date,i,"BEGINNING"); %end;   run; %mend; %doit   However this won't work...   Any way to fix this? ... View more