Credible range for the variance of a frailty term in a penalized Cox model

["Hunsicker, Lawrence" <lawrence-hunsicker@uiowa.edu>]

Hi, folks.  Another question.

If I do a coxph with a frailty term, the summary tells me that the variance of the frailty term is 0.0305.  But I am not sure what the credible range is for this variance.  The 'intervals' function doesn't work on a penalized Cox model, apparently.  Is there a good way to test whether there is significant residual variability by frailty term after correction for the fixed effects?

Larry Hunsicker