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Re: st: Capturing the date and which something first occurs


From   brendan.halpin@ul.ie (Brendan Halpin)
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Capturing the date and which something first occurs
Date   Fri, 06 Apr 2012 18:37:27 +0100

On Fri, Apr 06 2012, Richard T. Campbell wrote:

> So, for ID 1, the first time at which state = 1 occurs is the fourth
> record, for
> ID 2 it is the third record etc. I want to assign a value within an id
> equal to
> that index. For example, for ID 1 I want a variable that equals 4 for all
> ten cases, for ID 2 a variable equal to 3 for all cases etc. Put
> differently,
> I want to assign to all cases within an id, the value of _n when first = 1.
> I can't seem to get my head around how to do this.

by id (time), sort: egen starttime=max(time*first)

or 

gen st = time if first
by id (time), sort: egen starttime=max(st)

Brendan
-- 
Brendan Halpin,   Department of Sociology,   University of Limerick,   Ireland
Tel: w +353-61-213147  f +353-61-202569  h +353-61-338562;  Room F1-009 x 3147
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http://teaching.sociology.ul.ie/bhalpin/wordpress         twitter:@ULSociology
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