How can we do a window sum here in SAS VA?
See if this thread can help you.
https://communities.sas.com/t5/SAS-Procedures/Calculating-rolling-window-covariance-in-SAS/td-p/1465...
There is also a SUGI paper Easy Rolling Statistics with PROC EXPAND Premal P. Vora, Penn State Harrisburg, Middletown, PA. Google it.
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