How to calculate rolling sum over period of 4 weeks

[fciciarelli]

Please, I've data organize in weeks. Now I'll do a total sum of last 4 weeks over last week.

Could you help me?

Thanks in advance.

F.

[PaigeMiller]

Examples are here: https://documentation.sas.com/?cdcId=pgmsascdc&cdcVersion=9.4_3.4&docsetId=etsug&docsetTarget=etsug_...