Message-ID: <FDD0F83B87BB0A4CA4CC8919C1502BFC045E9777@vicexchange.prant.praintl.local>
Date: 2005-12-13T18:13:51Z
From: Singh, Jatinder
Subject: Frailty with a Weibull PH Model
Hi,
I am trying to fit a Weibull PH model with a gaussian frailty term
(kidney data). Is the following approach correct?
1. Fit the model using survReg with the frailty term added in.
Kidn1<-survreg(formula = Surv(rtime, event)~
age+sex+gn+an+pkn+frailty.gaussian(patient), data=kidney,
dist='weibull')
2. Based on Venables and Ripley (350-353), divide the negative of the
coefficients by the scale parameter to obtain the Weibull PH model
coefficients.
Jindi
Jatinder Singh
Senior Manager, Analysis and Reporting
PRA International
300-730 View Street
Victoria, B.C. V8W 3Y7
Tel: 250-483-4416
Fax: 250 483 4588
http://www.prainternational.com
e-mail: singhjatinder at praintl.com