Thanks for your reply! Actually, the dataset I listed there is the output from the proc freq on a larger dataset. But that only give me the combinations with one level from each variable. I'm looking for a way to grab multiple levels from each variable. For example, for V2, it can take the form of A, F or (A, F). For V1, it can take CO, KY, NY, (CO, KY), (CO, NY), (KY, NY) OR (CO, KY, NY). I have actually figured out a way to list all POSSIBLE combinations like this, but the part that I got stuck is how to identify the valid combinations out of all possible combinations. As I mentioned, [KY].. . . is not a valid combination as it didn't show up in the data. The single level combinations are easy, but when it is multiple levels combined, how do I verify if it's valid or not?
... View more
