Hi,
I have dataset as follows:
Group Value
a 1
a 2
a 3
b 1
b 2
b 3
....
Is there a way to add group id to the dataset like follows:
Group Value group_id
a 1 1
a 2 1
a 3 1
b 1 2
b 2 2
b 3 2
....
I can use proc sql and join to do this, but is there any other simpler way?
Assuming the data is sorted by group
data want;
set have;
by group;
retain group_id 0;
if first.group then group_id+1;
run;
If the data is grouped by the group variable but not in sort order:
data want;
set have;
by group notsorted;
retain group_id 0;
if first.group then group_id+1;
run;
Assuming the data is sorted by group
data want;
set have;
by group;
retain group_id 0;
if first.group then group_id+1;
run;
If the data is grouped by the group variable but not in sort order:
data want;
set have;
by group notsorted;
retain group_id 0;
if first.group then group_id+1;
run;
Thank you very much. It worked.
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