data T; input ID L EXP; Datalines; 1 1 10 1 2 10 1 2 20 1 3 30 2 1 10 2 1 10 2 2 60 3 2 60 ; data want; set t; by id; if first.id and first.L > 1 then exp=. ; run;
Hi,
in this sample I want to update exp to null in case that in every first ID the first L is >1 which is the case with ID = 3
Where is the mistake in the code?
Thanks for the help.
A first. variable is only created for variables named in the BY statement, and it is boolean, meaning it will only take on the values 0 or 1.
Corrected code:
data want; set t; by id; if first.id and L > 1 then exp = .; run;
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