R help - Apr 2011 - Rpart decision tree

Dear useRs:

I try to plot an rpart object but cannot get a nice tree structure plot.  I
am using plot.rpart and text.rpart (please see below) but the branches that
connect the nodes overlap the text in the ellipses and rectangles.  Is there
a way to get a clean nice tree plot (as in the Rpart Mayo report)?  I work
under Windows and use R2.11.1 with rpart version 3.1-46.

Thank you.

Tudor

...
plot(cart, uniform=TRUE, branch=0.25, compress=TRUE, margin=0.25)
text(cart, use.n=TRUE, all=TRUE, fancy=TRUE, fheight=0.95)
...


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Hi Tudor,
What type of tree did you create? (classification or regression?)
Could you give an explanation as to what is not looking nice?



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On Fri, Apr 8, 2011 at 2:03 PM, tudor <tudor_bodea@hotmail.com> wrote:
> Dear useRs:
>
> I try to plot an rpart object but cannot get a nice tree structure plot.  I
> am using plot.rpart and text.rpart (please see below) but the branches that
> connect the nodes overlap the text in the ellipses and rectangles.  Is
> there
> a way to get a clean nice tree plot (as in the Rpart Mayo report)?  I work
> under Windows and use R2.11.1 with rpart version 3.1-46.
>
> Thank you.
>
> Tudor
>
> ...
> plot(cart, uniform=TRUE, branch=0.25, compress=TRUE, margin=0.25)
> text(cart, use.n=TRUE, all=TRUE, fancy=TRUE, fheight=0.95)
> ...
>
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/Rpart-decision-tree-tp3435888p3435888.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org 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.
>
	[[alternative HTML version deleted]]

On Fri, 8 Apr 2011, tudor wrote:
> Dear useRs:
>
> I try to plot an rpart object but cannot get a nice tree structure plot.  I
> am using plot.rpart and text.rpart (please see below) but the branches that
> connect the nodes overlap the text in the ellipses and rectangles.  Is
there
> a way to get a clean nice tree plot (as in the Rpart Mayo report)?  I work
> under Windows and use R2.11.1 with rpart version 3.1-46.
You could check out whether you like the plots generated in the
"party"
package better. See example("ctree", package = "party").

If you like the plots but don't want to use ctree() instead of rpart():
Then you could install the "partykit" package from R-Forge and then do
plot(as.party(...)) for your "rpart" object.

hth,
Z
> Thank you.
>
> Tudor
>
> ...
> plot(cart, uniform=TRUE, branch=0.25, compress=TRUE, margin=0.25)
> text(cart, use.n=TRUE, all=TRUE, fancy=TRUE, fheight=0.95)
> ...
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Rpart-decision-tree-tp3435888p3435888.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org 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.
>

Hi Tal:

Thanks for your quick reply.

I tried to create a classification tree.  

The problem is that the branches overlap the text in the ellipses (inner
nodes) and rectangles (terminal nodes) - At times this makes it difficult
for the reader to correctly process the results.  One way to overcome this
behavior would be to force the node connectors to show only outside of
ellipses and rectangles - so far, however, I could not implement this
behavior.

Tudor

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Hi Achim:

I will give it a try and let you know how it goes.

Thanks.

Tudor


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