[R] how to obtain CI of the random effects variance in a frailty model?

From: SUBIRANA CACHINERO, ISAAC <isubirana_at_imim.es>
Date: Sat 16 Apr 2005 - 04:15:27 EST


Hello,  

Does anyone know how to obtain a confidence interval for the random effects variance in a frailty Proporcional Hazard Cox (PHC) model?.  

The sintaxis in R is of the form:  

>model<-coxph(Surv(time,cens)~frailty.gaussian(hospital))
 

from the 'survival' library.  

If I'm not wrong, the instruction  

>summary(model)
 

returns the estimation of the random effects (hospital) variance, but not the deviation of this estimation.  

Or, if there's another function instead, perhaps from another library, of 'coxph' that could estimate a frailty PHC model and the standard deviation of the random effects variance.    

Thanks in advance.



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