I need to program market share based on a rolling 3 months average. I am using patient claims data. I would need to use a do loop to calculate the moving average by group (moving average of patients by brand by month) then calculate market share. Can someone help me with this?
Do you have ETS? You could use PROC EXPAND (https://blogs.sas.com/content/iml/2016/01/27/moving-average-in-sas.html)
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