[R] Two-way non-parametric ANOVA?

[David Airey]

> 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
>

A couple more references here are below. I liked the Scheirer reference.

/*
Scheirer CJ, Ray WS, Hare N (1976) The analysis of ranked data derived
from completely randomized factorial designs. Biometrics 32:429-434

Groggel DJ, Skillings JH (1986) Distribution-free tests for main effects
in multifactor designs. American Statistician 40:99-102
*/