On Tue, 7 Nov 2006, yongchuan wrote:
I'm doing a cox regression with frailty:
model - coxph(Surv(Start,Stop,Terminated)~ X + frailty(id),table)
I understand that model$frail returns the group level frailty
terms. Does this mean this is the average of the frailty
values for the respective groups?
It is the frailty value that is common to all the measurements with the
same id value.
Also, if I'm fitting it to
a gamma frailty, how do I extract the rate and scale
parameters for the different gamma distributions fit to each
group? Thanks.
There are not different gamma distribution fit to each group. There is one
gamma distribution.
-thomas
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