Datum: Fri, 24 Nov 2006 17:54:38 +0100
Von: Paolo Radaelli [EMAIL PROTECTED]
An: r-help@stat.math.ethz.ch
Betreff: [R] Splitting criterion in tree and rpart
Dear all,
I'm interested in fitting a classification tree by using a
user-specified splitting criterion. If I am right, Tree package allows to
use only
deviance or gini while rpart package offers anova, poisson, class
or exp. and tries to make an intelligent guess if method is missing.
anova, ... are not splitting criteria, but the kind of tree you want to
construct, which depends on the dependent variable of your data.
I also found that, in rpart, method can be a list of functions named init,
split and eval but I really don't know how can I do it. Does someone can
suggest me some documentation I can have a look do define my splitting
criterion and pass it to rpart ?
Here you can find an Technical Report that might help you:
http://www.mayo.edu/hsr/techrpt/61.pdf
Henri
Thanks
Paolo
Paolo Radaelli
Dipartimento di Metodi Quantitativi per le Scienze Economiche ed Aziendali
Facoltà di Economia
Università degli Studi di Milano-Bicocca
e-mail [EMAIL PROTECTED]
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