Agreed, but you get order subid=4,1,2,3 and 4,1,3,2 was requested. Maybe they wanted data want; do i = 1 to ceil(last/2);      p = last - i + 1;      set have point=p nobs=last;      output;      if i < p then do;           set have point=i;           output;           end;      end; stop; drop i; run; PG ... View more