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Re: st: Cox proportional hazard model


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Cox proportional hazard model
Date   Thu, 12 Aug 2010 21:56:28 +0000 (GMT)

--- On Thu, 12/8/10, Nyasha Tirivayi wrote:
> So the duration of the AIDS medication taken by the patient
> is the time variable, and getting employed/returning to work
> is the event

The time variable and the event are not two separate concepts,
the duration is the time till the event occurs. When you look
at time till employment, then starting AIDS medication is not 
the beginning of a spell, leaving the labor market, leaving 
school, becoming unemployed, are the beginning of the spell.
Whether or not the patient takes AIDS medication is your
explanatory variable, not your explained variable.

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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