Thanks a lot Joe! I will take a further look at the article...
On 3/8/06, Joseph Retzer <[EMAIL PROTECTED]> wrote: > > Hi Michael, > I've looked into this a bit and the only parameter that seems to be > suggested (by Brieman and a Salford Systems white paper) as one which may > have an impact on the RF model is that which sets the number of potential > split variables (mtry) for each tree split. The default for categorical > response is root(total number of attributes) and (total number of > attributes)/3 for regression. Take a look at the tuneRF function in > randomForest which takes the default and searches above and below to see if > the OOB error rate can be improved by changing mtry. Based on my very > limited experimentation with the program, the default value seems to > be tough to improve on. > Best of luck & take care, > Joe Retzer > > *Michael <[EMAIL PROTECTED]>* wrote: > > It did not have a legend showing on which color is for class1, which color > is for class2, etc... > > I've read the R-help page. > > It lists a lot of options, but it did not say which ones are the key > parameters that people use most for improving performance... > > Do you know? > > On 3/7/06, Liaw, Andy wrote: > > > > As ?plot.randomForest says, it plots error rates. In addition to overall > > error rates, it also plots error rates for each class. > > > > As to the options in randomForest, read about the options in the help > page > > and the reference linked from the help page. > > > > Andy > > > > From: Michael > > > > > > When I plot the randomForest object, it shows a graph with 3 > > > lines, green, red and black, what's the meaning of these three lines? > > > > > > On 3/7/06, Michael wrote: > > > > > > > > Hi all, > > > > > > > > I am trying to play around with the randomForest function for > > > > classification. I know its performance is great. > > > > > > > > I am currently using the default options. > > > > > > > > It has many options. > > > > > > > > How do I further tweak the options so that I can make its > > > performance > > > > even better? > > > > > > > > What are the options that are mostly used? > > > > > > > > Thanks a lot! > > > > > > > > M > > > > > > > > > > [[alternative HTML version deleted]] > > > > > > ______________________________________________ > > > [email protected] mailing list > > > https://stat.ethz.ch/mailman/listinfo/r-help > > > PLEASE do read the posting guide! > > > http://www.R-project.org/posting-guide.html > > > > > > > > > > > > > > > ------------------------------------------------------------------------------ > > Notice: This e-mail message, together with any attachment...{{dropped}} > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > > [[alternative HTML version deleted]] ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
