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.