Hi, I have a question about the output for variance of random effect from a gamma frailty model using coxph in R. Is it the vairance of frailties themselves or variance of log frailties? Thanks. Guanghui
output of variance estimate of random effect from a gamma frailty model using Coxph in R
2 messages · ghwei@umich.edu, Thomas Lumley
On Thu, 21 Jul 2005 ghwei at umich.edu wrote:
Hi, I have a question about the output for variance of random effect from a gamma frailty model using coxph in R. Is it the vairance of frailties themselves or variance of log frailties? Thanks.
For a Gamma frailty model it is the variance of the Gamma distribution, so the variance of the frailties. For Gaussian frailty it will be the log frailties, though. -thomas