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st: time-dependent covariates


From   Mohammad Khedr <mkhkheder@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: time-dependent covariates
Date   Fri, 5 Dec 2003 00:43:28 -0800 (PST)

I have a data set similar to Stanford heart transplant
data

1. some patients on waiting list who did not receive a
transplanted organ

2. others received a transplanted organ

if we want to consider transplantation as a time
dependent covariate " the risk of death before
transplantation is deferent form the risk after
transplantation". knowing that we have 

Listing date
Transplantation date
Last seen date

and one record per patient

how to generate a time dependent covariate in this
case.

thanks 

M. Khedr
Epidemiologist

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