[R] Obtaining the surrogate splits from rpart
Prof Brian Ripley
ripley at stats.ox.ac.uk
Tue Oct 30 20:51:59 CET 2001
On Tue, 30 Oct 2001, Clayton Springer wrote:
> Dear r-help,
> I am trying to obtain the surrogate splits from an rpart object
> The documentation for rpart.object mentions splits (a matrix
> with the surrogate splits in it). But it does not seem to
> be quite right.
In what respect?
> Thanks in advance for your help,
> p.s. It would help my understanding,
> if you could give your answers using the built in "fit" example
> from rpart.
> > data(kyphosis)
> > fit <- rpart(Kyphosis ~ Age + Number + Start, data=kyphosis)
summary.rpart prints them out for you, so just examine its R code
to see how to extract them.
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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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