[R] Testing strata by covariate interactions in coxph

[Thomas Lumley]

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