R help - Oct 2001 - Obtaining the surrogate splits from rpart

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.


Thanks in advance for your help,

Clayton



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)
-- 
Clayton Springer, Ph. D.
Sandia National Laboratories                      csprin at ca.sandia.gov
Biosystems Research Department                    (925) 294-2143
P.O. Box 969, MS 9951                fax:         (925) 294-3020
Livermore, CA, 94551-0969

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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,
>
> Clayton
>
> 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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