Hi, here are three results of random forest (version 4.0-1). The results seem to be more or less the same which is strange because I changed the classwt. I hoped that for example classwt=c(0.45,0.1,0.45) would result in fewer cases classified as class 2. Did I understand something wrong?
Christian x1rf <- randomForest(x=as.data.frame(mfilters[cvtrain,]), y=as.factor(traingroups), xtest=as.data.frame(mfilters[cvtest,]), ytest=as.factor(testgroups)) > x1rf$test$confusion 1 2 3 class.error 1 9954 30 19 0.00489853 2 139 1854 0 0.06974410 3 420 0 84 0.83333333 x1rf <- randomForest(x=as.data.frame(mfilters[cvtrain,]), y=as.factor(traingroups), xtest=as.data.frame(mfilters[cvtest,]), ytest=as.factor(testgroups),classwt=c(0.45,0.1,0.45)) > x1rf$test$confusion 1 2 3 class.error 1 9952 31 20 0.00509847 2 164 1828 1 0.08278976 3 440 0 64 0.87301587 x1rf <- randomForest(x=as.data.frame(mfilters[cvtrain,]), y=as.factor(traingroups), xtest=as.data.frame(mfilters[cvtest,]), ytest=as.factor(testgroups),classwt=c(0.49,0.02,0.49)) > x1rf$test$confusion 1 2 3 class.error 1 9948 35 20 0.00549835 2 170 1823 0 0.08529854 3 439 0 65 0.87103175 *********************************************************************** Christian Hennig Fachbereich Mathematik-SPST/ZMS, Universitaet Hamburg [EMAIL PROTECTED], http://www.math.uni-hamburg.de/home/hennig/ ####################################################################### ich empfehle www.boag-online.de ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html