[R] help with RandomForest classwt option

Weiwei Shi helprhelp at gmail.com
Mon Jan 29 03:16:58 CET 2007

Dear Betty:

I could suggest 3 options:

1. try to use rf in fortran by following the linky below

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.



On 1/28/07, Betty Health <betty.health at 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.

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