[R] help with RandomForest classwt option

[Weiwei Shi]

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 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]]
>
> ______________________________________________
> 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.
>


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

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