Thank you very much, Weiwei and Jim! Yeah, I did read the post by Andy, the contributor of this package. It seems that classwt is not implemented yet. For Weiwei's options, I have a few more questions. Thanks!
"1. try to use rf in fortran by following the linky below http://www.stat.berkeley.edu/~breiman/RandomForests/cc_software.htm"; I read the Fortran code briefly. But I did not find the options for down sampling. So does that mean I need to do down sampling myself? Could you explain a little more about "2. make a wrapper function to do the down sampling by yourself"? You mean I can do it in R or in Fortran? Some links plz? I haven't done this before. Yeah, cut off did change for the final classification results. However from what I tried, they did not influence how the nodes are split. So I would go further in the above 2 options. Thank you again! Betty On 1/28/07, Weiwei Shi <[EMAIL PROTECTED]> wrote: > > 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 > [[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.
