R help - Feb 2007 - rpart

Hello,
I have a question for rpart,
I try to use it to do prediction for a continuous variable.
But I get the different prediction accuracy for same training set, 
anyone know why?

Aimin

are you sure you are using the same setting,  tree size, and so on?

On 2/5/07, Aimin Yan <aiminy at iastate.edu>
wrote:
> Hello,
> I have a question for rpart,
> I try to use it to do prediction for a continuous variable.
> But I get the different prediction accuracy for same training set,
> anyone know why?
>
> Aimin
>
> ______________________________________________
> R-help at 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.
>

-- 
WenSui Liu
A lousy statistician who happens to know a little programming
(http://spaces.msn.com/statcompute/blog)

Yes, I use the same setting, and I calculate MSE and CC as
prediction accuracy measure.
Someone told me  I should not trust one tree and should do bagging.
Is this correct?
Aimin

At 03:11 PM 2/5/2007, Wensui Liu wrote:
>are you sure you are using the same setting,  tree size, and so on?
>
>On 2/5/07, Aimin Yan <aiminy at iastate.edu> wrote:
>>Hello,
>>I have a question for rpart,
>>I try to use it to do prediction for a continuous variable.
>>But I get the different prediction accuracy for same training set,
>>anyone know why?
>>
>>Aimin
>>
>>______________________________________________
>>R-help at 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.
>
>
>--
>WenSui Liu
>A lousy statistician who happens to know a little programming
>(http://spaces.msn.com/statcompute/blog)