[R] question regression trees

[Darin A. England]

Claudia,
Can you send us the actual call you are making to rpart()?
The call to plot() doesn't really help.
Darin

On Wed, Feb 28, 2007 at 11:53:45AM -0500, Wensui Liu wrote:
> with seeing more code and output, i guess your tree fails to grow.
> 
> On 2/28/07, Claudia Romero <cromero at botany.ufl.edu> wrote:
> > Hello,
> > This is my first time addressing such a big audience so apologies in
> > advance in case I fail to formulate this question.
> >
> > I am working with 13 species of trees, and the data I have are:
> >   1 continuous (phenolic concentration in xylem and in phloem) and 2
> > categorical variables: lineage (3 subclades) and habitat (fire and non
> > fire).
> >
> > I am trying to see how species can be splitted 'objectively' based on
> > these variables. I tried to do a regression tree using the rpart
> > library, but repeatedly got the following answer, even when I tried to
> > run it using ONLY the categorical variables:
> >
> >  > plot(fit, compress=TRUE)
> > Error in plot.rpart(fit, compress = TRUE) :
> >          fit is not a tree, just a root
> >
> > Can anyone please help me think about this?
> >
> > Many thanks,
> > claudia romero
> >
> > ______________________________________________
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> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
> 
> 
> -- 
> WenSui Liu
> A lousy statistician who happens to know a little programming
> (http://spaces.msn.com/statcompute/blog)
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.