what is a method for assigning first.var and last.var to the by groupvariable on unsorted data? : Sas programming
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Answer / Kuldeep Chahal
"A method for assigning FIRST.VAR and LAST.VAR to the BY GROUPVARIABLE on unsorted data is to use Proc Sort beforehand, or use the 'keep=first' and 'drop=last' options within a DATA step."
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