I am using SAS 9. Let's say my data appears as the following: Pt Disease1 Disease2 Disease3 Disease4 1 . 1 . 1 2 . . 1 . 3 1 . . . 4 . . . 1 5 1 . 1 . 6 . 1 . . Most of my patients only have one disease, but I would like to capture patients with multiple diseases, so desired output would be Pt Disease1 Disease2 Disease3 Disease4 1 . 1 . 1 5 1 . 1 . I've tried something like "if (disease1 and disease2 and disease3 and disease4) ge 2 then diseaseMult=1" but that is not working. Is there a way to say something like "if at least 2 of (disease1 and disease2 and disease3 and disease4)=1 then diseaseMult=1"? Thanks!
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