[R] survreg() with frailty

From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.be>
Date: Thu, 17 Apr 2008 14:59:38 +0200

Dear R-users,

I have noticed small discrepencies in the reported estimate of the variance of the frailty by the print method for survreg() and the 'theta' component included in the object fit:

# Examples in R-2.6.2 for Windows

library(survival) # version 2.34-1 (2008-03-31)

# discrepancy

fit1 <- survreg(Surv(time, status) ~ rx + frailty(litter), rats) fit1

# OK

fit2 <- survreg(Surv(time, status) ~ rx + frailty(litter, df = 13), rats)

# discrepancy

fit3 <- survreg(Surv(time, status)~ age + sex + frailty(id), kidney) fit3

# OK

fit4 <- survreg(Surv(time, status)~ age + frailty(id), kidney) fit4

Am I missing something? Thanks in advance for any pointers!


Dimitris Rizopoulos
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium

Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/

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