Help using Base SAS procedures

processing data set

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processing data set

Relatively new to SAS and am struggling with a simple concept. I have a dataset with series of monthly sales figures and I just want to add a column that shows the sales for the last 12 months (I need to sum the last 12 months of the monthly column). I'm guessing there is a relatively simple way to do this, but have not been able to get anything to work. Any advice? Thanks in advance!
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Re: processing data set

Posted in reply to deleted_user
I think that this thread talks about just the question you are asking:
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