Re: [R] survreg with frailty

From: Terry Therneau <therneau_at_mayo.edu>
Date: Fri, 18 Apr 2008 08:13:34 -0500 (CDT)

  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 survreg.   

  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.   

          Terry Therneau



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