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Re: st: numbering observations when variables change


From   Nick Cox <n.j.cox@stata.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: numbering observations when variables change
Date   Tue, 23 Sep 2008 12:34:42 -0500

What you wrote gives the number of observations for each combination of variables. You want

. egen id = group(name year)

Nick
n.j.cox@durham.ac.uk

Fabian Brenner wrote:


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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