On Thu, Mar 10, 2011 at 6:33 AM, hongsheng wu <comp...@gmail.com> wrote: > Dear all, > > When I ran a frailty model like, > > model <- coxph(Surv(Day, Indicator) ~ trt + frailty(group, > distribution="gaussian")) > > The variance of effect estimate of trt was estimated by conditional model or > marginal model?
The frailty model is a conditional model, that is, the hazards for different treatment groups are assumed proportional conditional on the frailty. -thomas -- Thomas Lumley Professor of Biostatistics University of Auckland ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.