Re: [R] help with RandomForest classwt option

From: Weiwei Shi <helprhelp_at_gmail.com>
Date: Mon 29 Jan 2007 - 02:16:58 GMT

Dear Betty:

I could suggest 3 options:

  1. try to use rf in fortran by following the linky below http://www.stat.berkeley.edu/~breiman/RandomForests/cc_software.htm
  2. make a wrapper function to do the down sampling by yourself
  3. try to use cutoff in randomForest, which might help in your situation.

HTH, weiwei

On 1/28/07, Betty Health <betty.health@gmail.com> wrote:
> Hello there,
>
> I am working on an extremely unbalanced two class classification problems. I
> wanna use "classwt" with "down sampling" together. By checking the rfNews()
> in R, it looks that classwt is not working yet. Then I looked at the
> software from Salford. I did not find the down sampling option. I am
> wondering if you have any experience to deal with this problem. Do you know
> any method or softwares can handle this problem?
>
> Thank you very much!!
>
> Betty
>
> [[alternative HTML version deleted]]
>
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>

-- 
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.

"Did you always know?"
"No, I did not. But I believed..."
---Matrix III

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Received on Mon Jan 29 13:24:07 2007

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