hello,
I want to add a column of obs which count the number of observations by id
table
id a
1 2
1 6
1 5
2 4
2 9
2 5
I want to have
id a obs
1 2 1
1 6 2
1 5 3
2 4 1
2 9 2
2 4 3
2 5 4
data want;
set have;
by id;
if first.id then obs=0;
obs+1;
run;
View solution in original post
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