proc factex;
factors a b c/nlev=3;  /*首先指定4个因素均为3水平。*/
size design=min;
model estimate=(a b c);
output out=mixed
a cvals=('正常' '较高'  '较高') /*在结果显示语句中将A因素降低为2个水平。*/
b cvals=('低度' '中度' '高度')
c cvals=('小' '中' '大')
designrep=3;
proc print;
run;


