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st: RE: numbering observations when variables change


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: numbering observations when variables change
Date   Tue, 23 Sep 2008 17:34:29 +0200

-h egen, group()-


HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Fabian Brenner
Sent: Tuesday, September 23, 2008 5:33 PM
To: statalist@hsphsun2.harvard.edu
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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