i have data as seen below. Instructors have a unique email address but may have multiple IDs if they serve more than one school. The restriction on the file I'm submitting is only one ID per instructor. I want to find all cases such as hsmith@yahoo.com and give him the same ID in all obs. (It doesn't matter which one as long as he only has one.) Right now, I'm running a PROC FREQ with a TABLE statement of email*tchid/list and doing a visual inspection (not exactly an elegant solution.) email tchid jdoe@aol.com 01 sjones@hotmail.com 02 hsmith@yahoo.com 03 hsmith@yahoo.com 04
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