[R] survreg with frailty
therneau at mayo.edu
Fri Apr 18 15:13:34 CEST 2008
The combination of survreg + gamma frailty = invalid model, i.e., the example
that you quote.
I did not realize that this had been added to the survreg help file until very
recently. I will try to fix the oversight. Other, more detailed documentation
states that Gaussian frailty + AIC is the only valid random effects choice for
Details: frailty(x) with no optional arguments defaults to "mle" as the method
of choosing the variance of the random effect, via a calculation that is
specific to the Cox model.
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