-h egen, group()-
HTH
Martin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Fabian Brenner
Sent: Tuesday, September 23, 2008 5:33 PM
To: [email protected]
Subject: st: numbering observations when variables change
Dear all,
I want to use variable "id" to number observations. Whenever "name" or
"year" changes, "id" should increase by 1. I have sorted the data by name
and year (-sort name year-). I tried to solve the problem by -bysort name
year: generate id=_N- but it did not work.
Hopefully someone can help me.
Regards,
Fabian
Example:
"id" "name" "year"
1 A 1990
1 A 1990
2 A 2001
3 B 2001
4 B 2003
5 B 2007
5 B 2007
6 C 2007
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