[R] is this a bug? problem saving and restoring coxph objects

Thomas Lumley thomas at biostat.washington.edu
Sat Mar 25 18:34:39 CET 2000

On 25 Mar 2000, Peter Dalgaard BSA wrote:

> Ramon Diaz-Uriarte <rdiazuri at students.wisc.edu> writes:
> > I am using R 1.0.0 on Linux, and I am running into a problem with coxph objects
> > (library survival5).
> > 
> > If I fit a model that includes a frailty term with sparse=F (e.g
> > my.model<-coxph(Surv(t,censor)~trt+frailty(id,sparse=F))),
> > 
> > when I try to save all the objects (e.g., save.image()) I get the error:
> > 
> It certainly quacks like a bug and walks like a bug...
> Does your example work (or rather: not work) with any old values of
> the variables t, censor, trt and id? If not could you provide us with
> a set of values that provokes the crash on your machine?

An example on my machine is

	rfit2a <- survreg(Surv(time, status) ~ rx + frailty(litter,df =
                     13, sparse = T), data = rats) 

so it doesn't even require sparse=F. It doesn't seem to happen with
frailty.gaussian, but I can't be sure since it doesn't happen with all


Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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