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max number of variables in coxph

To: s-news@lists.biostat.wustl.edu
Subject: max number of variables in coxph
From: carol white <wht_crl@yahoo.com>
Date: Sun, 20 May 2007 06:11:51 -0700 (PDT)
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Dear All,
Knowing the number of samples and censored patients in a data set, is there any way to find out how many variables (max) should be used so that a solution for the maximum partial likelihood estimation in cox regression using coxph would exist?

thanks

carol


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