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st: stcox with continuously time-varying covariates only


From   KRISTIEN VERHEYEN <kristien.verheyen@aht.org.uk>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: stcox with continuously time-varying covariates only
Date   Thu, 28 Aug 2003 14:48:49 +0100

Hello, 

I am trying to fit a Cox model on a dataset with both fixed and time-varying
covariates (tvc). However, Stata will not fit a model with tvc only. I have
received two different error messages when trying to do this: 

stcox, tvc(var)
last estimates not found 
(r301)   

or

stcox, tvc(var)
option tvc( ) not allowed
(r198)

It works fine when I also include a fixed variable in the model -
unfortunately none of my fixed variables are significant but the tvc are. I
have found a similar query in the Statalist archives but unfortunately no
answer! Please can somebody help. 

Thank you,
 
Kristien Verheyen
PhD student  

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