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st: how to use stcox in time-varying covariate model?


From   feng lu <lufengs@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: how to use stcox in time-varying covariate model?
Date   Wed, 31 May 2006 12:30:15 -0700 (PDT)

duration model with time-varying covariates, how do I
realize it by stcox?

         For Example, 

Id  time-varying variable year failure    duration
1          1.1           2000       0           1
1          1.35          2001        1          2   2 
        1.14         2000       0            1
2         1.39          2001        0            2   
2          1.61         2002     0               3
2           1.89         2003       0          4    
3         1.03           2000    0               1
3        1.30            2001    0               2
3          1.68         2002      1             3

           I read the stata book and found that the
example for time-varying covariate model is different
from mine.

          I tried two ways but both are wrong.

         One way: stset duration, id(id) failure(some
variable)
                Stcox

         It seems that this way only used the
time-varying variable in the first year.

        Another way, adopt the option  ˇ°tvcˇ±, but
the following words confused me
        If tvc(varlist) is used without texp(exp),
Stata understands
        that you mean texp(_t), and thus multiplies
the time-varying
        covariates by the analysis time.
          Could you give me some advice on how to do
time-varying model in Stata?
        Thanks a lot!



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