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 <[EMAIL PROTECTED]> 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 > > > > ______________________________________________ > > [email protected] 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. > > > > > -- > WenSui Liu > A lousy statistician who happens to know a little programming > (http://spaces.msn.com/statcompute/blog) > > ______________________________________________ > [email protected] 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. ______________________________________________ [email protected] 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.
