[R] Rpart - best split selection for class method and Gini splitting index
Prof Brian Ripley
ripley at stats.ox.ac.uk
Thu May 21 09:17:10 CEST 2009
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
> 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 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
> e-mail paolo.radaelli at unimib.it
> Tel +39 02 6448 3163
> Fax +39 02 6448 3105
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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