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Re: st: Re: multiple imputation and survival analysis


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: multiple imputation and survival analysis
Date   Fri, 1 May 2009 20:37:09 +0000 (GMT)

--- From: "Stephanie L Kent" wrote:
> > I'd like to run a cox regression in data declared
> > survival after using multiple imputation.
> > 
> > I ran the "ice" command then using the imputed data,
> > the micombine command followed by the stcox model. 
> > However, this produced models with coefficients rather
> > than hazard rates.  

--- On Fri, 1/5/09, Martin Weiss wrote:
> The example from the help file produces hazard ratios as
> default, and you have to request coefficients. I am having a
> hard time to believe that it behaves differently because of
> the imputation..

This is actually normal behavior, as -stcox- is not run separately
as Stephanie wrote, but within -micombine-. Stephanie can specify
the -eform- option within -micombine- to get hazard ratios. 

As a matter of terminology it is good to know that -stcox- never 
gives you hazard rates, but always hazard ratios. The whole point
of -stcox- is that you do not have to specify a functional form 
for the baseline hazard rate.
 
-- Maarten

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

http://home.fsw.vu.nl/m.buis/
-----------------------------------------




      

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