SAS rolling average code using patient claims data

[jkimmel]

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?

[Reeza]

If you need help please post some sample data and include anything you’ve tried to date. It also speeds things up if you show an example of the output that aligns with the input provided so logic can be verified.

[cankrd]

Do you have ETS? You could use PROC EXPAND (https://blogs.sas.com/content/iml/2016/01/27/moving-average-in-sas.html)