Yes, rpart.control() has a bunch of parameters... I don't know which one can mostly improve the classification performance.
On 3/9/06, Carlos Ortega <[EMAIL PROTECTED]> wrote: > > Hello, > > Yes, check rpart.control() for details. > > Regards, > Carlos. > > > On 3/9/06, Michael <[EMAIL PROTECTED]> wrote: > > > > I see! So you mean I have to collect error counts myself manually... > > > > By the way, what parameters do I normally change to improve the default > > rpart performance? > > > > Thanks a lot! > > > > > > On 3/8/06, Carlos Ortega <[EMAIL PROTECTED]> wrote: > > > > > > Hello Michael, > > > > > > In some of the examples in the rpart function you will find that > > > comparison between the actual and the predicted values, although it is for > > > the "Classification" mode, not for the regression. > > > > > > Regards, > > > Carlos. > > > > > > > > > On 3/7/06, Michael < [EMAIL PROTECTED] > wrote: > > > > > > > Hi all, > > > > > > > > > > > > > > > > What parameter do I normally change in the rpart function? How do I > > > > set the > > > > "cp" option? > > > > > > > > > > > > > > > > Is there a way to read off error rate directly from the "rpart" > > > > function for > > > > training data; I imagine for testing data I have to apply a > > > > "predict", but > > > > for training data I guess the error count would be somewhere > > > > existing once > > > > the "rpart" function is finished. Looks like it is related to > > > > expressions > > > > such as "expected loss=0.8362365" when using "summary" function. > > > > > > > > Now I have to do this manually, and when it came to compare the > > > > correct vs. > > > > wrong and count the errors, it was always very tedious... > > > > > > > > > > > > > > > > Thanks a lot! > > > > > > > > > > > > > > > > M. > > > > > > > > [[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<http://www.r-project.org/posting-guide.html> > > > > > > > > > > > > > [[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
