Hi. I have a small problem with creating a dataset I need for an analysis. Lets assume I have an ID variable "serial", and two different string variables: - "period" in the form 201403 - "period_renewed" in the same form First what I want to do is to delete all data where period>period_renewed. Further I want to keep only the observations from the last 6 periods from the point in time where period=period_renewed. Someone out there might have a simple solution to this problem, but I'm completely blank as I'm quite new to using SAS. Any feedback would be extremely welcome. /petter
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