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Re: st: multiple observations


From   Ronan Conroy <rconroy@rcsi.ie>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: multiple observations
Date   Tue, 9 Sep 2008 10:25:39 +0100

Replying on how to tag the last observation for each case,

On 8 Sep 2008, at 13:14, fjc fjc wrote:

You can also try:

gen newid = .
bysort id: replace newid = 1 if _n == _N
The problem is to make sure that the last observation for each id is really the last observation.

To be doubly sure, you need a variable that identifies the observation, then make sure that it too is sorted

bysort id (obsnumber) : replace newid=1 if _n == _N


Ronan Conroy
=================================

rconroy@rcsi.ie
Royal College of Surgeons in Ireland
Epidemiology Department,
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http://www.flickr.com/photos/ronanconroy/sets/72157601895416740/

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