Message-ID: <Pine.LNX.4.63a.0510060923480.29173@homer24.u.washington.edu>
Date: 2005-10-06T16:25:29Z
From: Thomas Lumley
Subject: Testing strata by covariate interactions in coxph
In-Reply-To: <JA8AAAAAAnjfpAABYQABU5AQ2thU@postila.stat.fi>
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