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 <[EMAIL PROTECTED]> 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@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 ______________________________________________ R-help@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.