Thank you, Andy I just read a paper, and they try to compare error rate among oob, test set, and training set and throung a figure showing random forest is not overfitting. when error rate in the training set come to zero, and oob and test set error rate do not increase. I am just a beginner, so I need learn a lot. Thank you kevin
å¨2010-01-12ï¼"Liaw, Andy [via R]" <ml-node+1011366-1798256...@n4.nabble.com> åéï¼ -----åå§é®ä»¶----- å件人:"Liaw, Andy [via R]" <ml-node+1011366-1798256...@n4.nabble.com> åéæ¶é´:2010å¹´1æ12æ¥ ææäº æ¶ä»¶äºº:bbslover <dlu...@yeah.net> 主é¢:Re: [R] Help me! using random Forest package, how to calculate Error Rates in the training set ? From: bbslover > > now I am learining random forest and using random forest > package, I can get > the OOB error rates, and test set rate, now I want to get the > training set > error rate, how can I do? > > pgp.rf<-randomForest(x.tr,y.tr,x.ts,y.ts,ntree=1e3,keep.forest > =FALSE,do.trace=1e2) > using the code can get oob and test set error rate, if I > replace x.ts and > y.ts with x.tr and y.tr,respectively, is the error rate in > the training set > ? > > pgp.rf<-randomForest(x.tr,y.tr,x.tr,y.tr,ntree=1e3,keep.forest > =FALSE,do.trace=1e2) > > this time, I get oob error rates and training set error rate, > is right? Yes, or if you used keep.forest=TRUE, feed predict() with your x.tr and compare that with y.tr. However, I really don't understand why people compute "training error rate": what useful information can you get from it? Andy > thank you! > -- > View this message in context: >http://n4.nabble.com/Help-me-using-random-Forest-package-how-t > o-calculate-Error-Rates-in-the-training-set-tp1010987p1010987.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ >[hidden email]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. > Notice: This e-mail message, together with any attachme...{{dropped:10}} ______________________________________________ [hidden email]mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. View message @http://n4.nabble.com/Help-me-using-random-Forest-package-how-to-calculate-Error-Rates-in-the-training-set-tp1010987p1011366.html To unsubscribe from Help me! using random Forest package, how to calculate Error Rates in the training set ?,click here. -- View this message in context: http://n4.nabble.com/Help-me-using-random-Forest-package-how-to-calculate-Error-Rates-in-the-training-set-tp1010987p1011752.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]]
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