[SPAM Detected: 81%] [R] rpart with circular data?

From: Rainer M Krug <r.m.krug_at_gmail.com>
Date: Mon, 12 May 2008 11:35:07 +0200


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

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