Re: [R] How to draw the decision boundaries for LDA and Rpart object

From: Am Stat <amstat2006_at_gmail.com>
Date: Thu 10 Aug 2006 - 07:45:08 EST

Dr. Ripley,

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?

Thanks very much!

Leon

> 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, ripley@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 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. Received on Thu Aug 10 08:04:13 2006

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.1.8, at Thu 10 Aug 2006 - 18:23:21 EST.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.