data ttt (drop=value period);
set testing;
by region;
if first.region and last.region then output ttt;
else output =duplicate;
run;
I get the error message that variable duplicate is uninitialized. PLease advice.
That's very simply because "duplicate" is not in the input data set.
It is not due to FIRST. or LAST.
Place the data set names in the Output like:
data ttt (drop=value period) duplicate;
Just one more thing - as you mentioned duplicate in the data step statement, would it create a new dataset which will capture other values excluding the first and the last obs of the group.
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