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st: R: Initial failure in Cox hazard models


From   "Carlo Lazzaro" <carlo.lazzaro@tin.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: R: Initial failure in Cox hazard models
Date   Fri, 6 Jun 2008 07:54:16 +0200

Dear Zackary,

I miss to get your following statement: but a large number of my cases fail
in the first time period for which they are observed and thus are being
excluded from the analysis.  

Why are they excluded? Are they censored cases?

Kind Regards,

Carlo
-----Messaggio originale-----
Da: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Per conto di Shirkey, Zachary
C
Inviato: giovedý 5 giugno 2008 20.23
A: statalist@hsphsun2.harvard.edu
Oggetto: st: Initial failure in Cox hazard models

I am using stcox to do survival analysis, but a large number of my cases
fail in the first time period for which they are observed and thus are being
excluded from the analysis.  I 'm concerned this is biasing my results.  How
can I deal with this issue?  Is there a statistical technique I can use in
stcox, or do I need to add a t=0 period prior to the beginning of each of my
cases?
 
Zachary Shirkey
Assistant Professor
Political Science Department
St. John Fisher College
124 Basil Hall
3690 East Ave.
Rochester, NY 14618
(585) 385-5253
 
 

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