<<Cliffordy@tsrcom.com asks>> I have 4 category variables each with a different number of values. I need to know an easy way to generate all the possible combinations and output the results to a file. Example:

Var1: A1 A2 A3 Var2: B1 B2 Var3: C1 C2 C3 C4 Var4: D1

then the output would start and continue like so:

Var1 Var2 Var3 Var4 A1 B1 C1 D1 A1 B1 C2 D1 A1 B1 C3 D1 A1 B1 C4 D1 A1 B2 C1 D1 . . . A3 B2 C4 D1 <<end original question>>

In situations where the number of variables is small, and the number of possible values for each is small and known in advance, nested do-loops provide probably the most straightforward solution:

data out; do var1 = 'A1','A2','A3'; do var2 = 'B1','B2'; do var3 = 'C1','C2','C3','C4'; do var4 = 'D1'; output; end; end; end; end; run;

Mike Rhoads Westat RhoadsM1@Westat.com