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Shivi82
Quartz | Level 8

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.

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KachiM
Rhodochrosite | Level 12

It is not due to FIRST. or LAST.

Place the data set names in the Output like:

data ttt (drop=value period) duplicate;

Shivi82
Quartz | Level 8

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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