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FW: group covariates in coxph with a frailty term?

To: <s-news@lists.biostat.wustl.edu>
Subject: FW: group covariates in coxph with a frailty term?
From: "Hunsicker, Lawrence" <lawrence-hunsicker@uiowa.edu>
Date: Fri, 22 Aug 2008 10:08:14 -0500
Thread-index: AckEXnNS5a4AurSpRtutenI250r3YwACmmAg
Thread-topic: [S] group covariates in coxph with a frailty term?

From: Hunsicker, Lawrence
Sent: Friday, August 22, 2008 8:53 AM
To: 's-news@lists.biostat.wustl.edu'
Subject: [S] group covariates in coxph with a frailty term?

Good morning, folks:

I would like to run a cox mixed model in which there are both individual covariates and group covariates.  When one is running a mixed linear model, one includes the group covariates in the specification of the random effects.  But so far as I can see, there is no way to do this with the “frailty” term in the coxph function.

What is the correct way to enter group covariates in the coxph model?

Many thanks in advance for your help or advice.

Larry Hunsicker

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