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st: Initial failure in Cox hazard models

From   "Shirkey, Zachary C" <>
To   <>
Subject   st: Initial failure in Cox hazard models
Date   Thu, 5 Jun 2008 14:22:31 -0400

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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