假设stratum为分层因素,分4层。
proc plan seed=20151223;
factors stratum=4 block=30 rand_code=4/noprint;
output out=a;
run;
data b;
set a;
id=_n_;
if rand_code in(1 2 4) then do;ARM=0;TRT="试验组";end;
else do;ARM=1;TRT="对照组";end;
run;