Re: [R] Two-way non-parametric ANOVA?

From: Matthias Gondan <matthias-gondan_at_gmx.de>
Date: Wed, 23 Jan 2008 14:45:36 +0100

Hi Diana,

Look at Edgar Brunner's Homepage

http://www.ams.med.uni-goettingen.de/en/sta/e.brunner.html

and here:

http://www.ams.med.uni-goettingen.de/en/sof/index.html

Unfortunately, the R script for a 2x2 design with two groups and two timepoints (f1.ld.f1.r) seems to be broken. Uncommenting the branch to the special case "case2x2" in the script should do well, and more than 2 groups or timepoints seem to be working, too.

The basic problem with non-parametric (i.e. ordinal) Anova with more than one factor is that the covariance matrix is not homoscedastic anymore after a rank transformation, and autoregressive or compound symmetry covariance structures are destroyed.

Best wishes,

Matthias

Diana Perdiguero schrieb:
> We need a two-way non-parametric ANOVA in order to analysis properly some
> ecological data, do you know any reference in R? or how to do it?
> Thank you very much
> All the best
>
> diana
>



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