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st: Time-varying coefficient in -stcox-

From   Prabal De <>
Subject   st: Time-varying coefficient in -stcox-
Date   Tue, 3 Mar 2009 02:17:57 -0500

Dear All,
 I am trying to fit an stcox model to explain school drop out. I am
confused about the time varying covariates. I have time-varying
covariates in principle as I want to see how previous semester’s grade
affects this semester drop out for several semesters. However, it
makes little sense to me to use -tvc- for this. I was planning to
create some lagged variables separately and use them as a regular
covariates in the regression. Is there a more elegant way? Can a
combination of -tvc- and -texp(_t)- do the same thing? I also have a
set of time-invariant coefficients like gender, race, standardized
scores etc. Any help will be wonderful.

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