R help - Sep 2011 - "rpart" or "tree" function issue

I am trying to create a classification tree using either tree or rpart
functions but when it comes to plotting the results the formatting I get is
different than what I see in all the tutorials (like
http://www.youtube.com/watch?v=9XNhqO1bu0A or
http://www.youtube.com/watch?v=m3mLNpeke0I&feature=related or
http://www.statmethods.net/advstats/cart.html "tree for kyphosis").  I
am
trying to take a large demographic population and create a tree which
systematically and accurately divides them into 2 pre-defined
classifications using multiple predictor variables.  What I would like to
see is what I have seen in the tutorials similar to to the ones provided
above, where it shows something like "12/2" in each leaf or stem or
step of
the tree which is meant to be interpreded as "at this step/stage there are
12 people of this category and 2 of the other.  Instead I am presently
getting something like .342524 which I guess could be the result of
divideing the two groups inorder to find some porportion but im not sure,
and would that be 34% group a or group b?  I was also wondering how you know
which side is the side of each test where the individual passes or fails?
Is yes/pass always on the left?

I'm pretty sure this is just a mater of changing some sort of default
settings and is in no way a critique of the fine work the designers of R
have freely provided us.


Thank you

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Hi,

Use packages "rpart.plot" or "maptree" to enhance the tree
drawing.
Or another alternative, use "party" package that offers much more
graphing
possibilities.

Regards,
Carlos Ortega
www.qualityexcellence.es


On Thu, Sep 8, 2011 at 5:27 PM, Brian Jensvold <brnjnsvld@gmail.com>
wrote:
> I am trying to create a classification tree using either tree or rpart
> functions but when it comes to plotting the results the formatting I get is
> different than what I see in all the tutorials (like
> http://www.youtube.com/watch?v=9XNhqO1bu0A or
> http://www.youtube.com/watch?v=m3mLNpeke0I&feature=related or
> http://www.statmethods.net/advstats/cart.html "tree for
kyphosis").  I am
> trying to take a large demographic population and create a tree which
> systematically and accurately divides them into 2 pre-defined
> classifications using multiple predictor variables.  What I would like to
> see is what I have seen in the tutorials similar to to the ones provided
> above, where it shows something like "12/2" in each leaf or stem
or step of
> the tree which is meant to be interpreded as "at this step/stage there
are
> 12 people of this category and 2 of the other.  Instead I am presently
> getting something like .342524 which I guess could be the result of
> divideing the two groups inorder to find some porportion but im not sure,
> and would that be 34% group a or group b?  I was also wondering how you
> know
> which side is the side of each test where the individual passes or fails?
> Is yes/pass always on the left?
>
> I'm pretty sure this is just a mater of changing some sort of default
> settings and is in no way a critique of the fine work the designers of R
> have freely provided us.
>
>
> Thank you
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> 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.
>
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