On Wed, 9 Aug 2006, Am Stat wrote: > Dr. Ripley,
R-help is not the address of `Dr. Ripley', nor even that of the person who wrote to you. > Thanks very much for your help. I have used your partition tree and it works > well. I am not familiar with the 'tree' package but I found that the > threshold to make a cut returned by tree and rpart is almost the same > value. > > Does that mean the decision boundaries for Rpart and Tree are the same for a > same data when using the default value of parameters, no matter what the > structure of data is? No, they can differ. There are comparisons in MASS (the book). > > Thanks very much! > > Leon > > > > > ----- Original Message ----- > From: "Prof Brian Ripley" <[EMAIL PROTECTED]> > To: "Am Stat" <[EMAIL PROTECTED]> > Cc: <r-help@stat.math.ethz.ch> > Sent: Wednesday, August 09, 2006 3:04 AM > Subject: Re: [R] How to draw the decision boundaries for LDA and Rpart > object > > > > On Wed, 9 Aug 2006, Am Stat wrote: > > > >> Hello useR, > >> > >> Could you please tell me how to draw the decision boundaries in a > >> scatterplot of the original data for a LDA or Rpart object. > > > > There are examples in MASS (the book). > > > >> For example: > >> > library(rpart) > >> >fit.rpart <- rpart(as.factor(group.id)~., data=data.frame(Data) ) > >> > >> > >> How can I draw the cutting lines on the orignial Data? > >> > >> Or is there any built in functions that can read the rpart object > >> 'fit.rpart' to do that? > > > > See partition.tree in package tree. > > > >> 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, [EMAIL PROTECTED] > > 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 > > ______________________________________________ > R-help@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. > -- Brian D. Ripley, [EMAIL PROTECTED] 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 ______________________________________________ R-help@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.