Hi SAS community, I have an issue regarding coding, I hope you can help me with. I have two data sets, a and b, containing three variables, hospitals, patient_id and date. For each patient_id there are multiple dates, and due to some definitions regarding what classifies as a new entry, I need to weed out excessive observations, which translated, code-wise corresponds to something like: data=a; if patient_id in a = patient_id in b and dates in b-30 days<date in a <dates in b+30 days then same=1; Else same=0; Basically, what I am have trouble with referencing across data sets, since a and b should be kept separated. Due to the information being sensitive, I cannot provide any concrete examples of data. Hope you guys can help me out. best, Chen
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