On Thu, 21 May 2009, Paolo Radaelli wrote:
Dear R-users,
I'm working with the Rpart package and trying to understand how the procedure
I presume you mean 'rpart': R package names are case sensitive.
select the best split in the case the method "class" and the
splitting index "Gini" are used. In particular I'd like to have look
to the source code that works out the best split for un unordered
predictor.
Does anyone can suggest me which functions in the sources I should
consider ?
It done in C. Start with file bsplit.c, that says
** The routine which will find the best split for a node
Then look at gini.c (again, pretty obvious, I believe).
Any input would be highly appreciated.
Thank you
Paolo
Paolo Radaelli
Dipartimento di Metodi Quantitativi per le Scienze Economiche ed Aziendali
Facoltà di Economia
Università degli Studi di Milano-Bicocca
Via Bicocca degli Arcimboldi, 8
20126 Milano
Italy
e-mail paolo.radae...@unimib.it
Tel +39 02 6448 3163
Fax +39 02 6448 3105
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