[R] rpart with circular data?

[Rainer M Krug]

Hi

I am planning to use a CART analysis with rpart() to analyse the
impact of, among others, slope, altitude and aspect on mortality
rates.
My question is:
Is there a p[roblem with using aspect as a predictor as it is circular?
And if it is a problem (which I suspect), is there a transformation I
could use to transform aspect?

Thanks

Rainer

-- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

Plant Conservation Unit
Department of Botany
University of Cape Town
Rondebosch 7701
South Africa