Re: [R] mantelhaen.test for more than two groups?

From: Thomas Lumley <tlumley_at_u.washington.edu>
Date: Wed 27 Apr 2005 - 02:08:07 EST

On Tue, 26 Apr 2005, Katrin Schweitzer wrote:

> Dear All,
>
> I'd like to perform the generalized Cochran-Mantel-Haenszel-Test (as
> described in Agresti (1990), Categorical Data Analysis) for my nominal data.
>
> My problem is that I have more than two groups. In fact I think I'd need an
> 5-dimensional array for the response variable, the control variable and three
> group variables.
> Could you please tell me if this is possible in R - and if yes how I am
> supposed to do this?

You're supposed to have a three-dimensional array: exposure x response x group.

This means turning your three group variables into one variable. One way to do this is with the interaction() function.

         -thomas

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley@u.washington.edu	University of Washington, Seattle

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