Re: [R] Testing strata by covariate interactions in coxph

From: Thomas Lumley <tlumley_at_u.washington.edu>
Date: Fri 07 Oct 2005 - 02:25:29 EST

On Thu, 6 Oct 2005, Pyy-Martikainen Marjo wrote:

> I specify a model with strata by covariate interactions. I would like to
> conduct a Wald test
> for the null hypothesis "no differences between any covariate effects in the 3
> groups".

The "survey" package has a function regTermTest (which isn't specific to survey models -- it works on anything with vcov() and coef() methods).

         -thomas



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