From your macro, eps.slt_rlt is your original dataset, but what's your dataset 'ten', I don't understand the second part of your macro.

data _null_;
set ten;

[此贴子已经被作者于2007-5-16 1:54:22编辑过]

按g拆开数据集

data a;
input g c;
cards;
1 2
1 10
2 5
;
run;

proc sort data=a;by g;run;
data b;set a;by g;
if first.g then g1+1;
run;
proc sql noprint;
select max(g1) into :n from b;
quit;
%macro test;
%do i=1 %to &n;
data a&i;
set b;
if g1=&i;
run;
%end;
%mend;
%test