R help - May 2010 - "rpart": how to use each variable only once?

Hi list,

Is there a way in "rpart" to force the variables only used once when
doing the splits?

This is how the question came about.  Often time, the tree constructed uses the
same variable (say X1) for the first and second splits, for example.  However,
due to practical reason, the researcher doesn't like this.  The prefer to
see the second split using other variables (say X2).  Therefore the question.  I
understand the performance will suffer.  However if there is a performance
improvement for the tree with X1 as 1st split and X2 as 2nd split comparing the
tree with one single split using X1, I guess it's still a reasonable thing
to do, right?

Many thanks!

...Tao

is this random decision tree, I dont know is there any package can run it.
If you know, please let me know.



On Fri, May 14, 2010 at 10:23 AM, Shi, Tao <shidaxia@yahoo.com> wrote:
> Hi list,
>
> Is there a way in "rpart" to force the variables only used once
when doing
> the splits?
>
> This is how the question came about.  Often time, the tree constructed uses
> the same variable (say X1) for the first and second splits, for example.
>  However, due to practical reason, the researcher doesn't like this. 
The
> prefer to see the second split using other variables (say X2).  Therefore
> the question.  I understand the performance will suffer.  However if there
> is a performance improvement for the tree with X1 as 1st split and X2 as
2nd
> split comparing the tree with one single split using X1, I guess it's
still
> a reasonable thing to do, right?
>
> Many thanks!
>
> ...Tao
>
> ______________________________________________
> 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.
>


-- 
Sincerely,
Changbin
--

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