o ha wang wrote: > Thanks! > > Yes, you were right. I loaded package 'tree'. > > I tried 'tree' and 'rpart' respectively, it looks like results for > regression tree are same, and very similar for classification tree. (more > biref using 'rpart' than using 'tree'). > > But my problems are still not been solved using rpart. > > 1. how to put number (n, ie. class counts) and probability (yprob) on the > plot for classification tree. There are only 0/1 on the plot. n and yprob > can be seen using 'myfit' but not on the plot. > > 2. The notation of Numbers are overlapped for regression tree. > > please see my rpart code: > > library (rpart) > myfit <- rpart (y ~ x1 + x2 + x3 + x4 ) > plot (myfit)); text (myfit, all= TRUE, cex=0.5, pretty=0) > myfit > summary(myfit)
I still cannot reproduce without y, x1, x2, x3, x4 Uwe Ligges > thanks, xiao yue > > > Uwe Ligges <[EMAIL PROTECTED]> wrote: > > > o ha wang wrote: >> Hi all, >> >> Can anyone who is familar with CART tell me what I missed in my tree code? >> >> library (MASS) >> myfit <- tree (y ~ x1 + x2 + x3 + x4 ) > > There is not function tree() in MASS. I guess you have loaded package > "tree"? > Note that the author and maintainer of the tree package suggests to use > package rpart instead. > > > >> # tree.screens () # useless >> plot(myfit); text (myfit, all= TRUE, cex=0.5, pretty=0) >> # tile.tree (myfit, fgl$type) # useless >> # close.screen (all= TRUE) # useless >> >> >> My current tree plot resulted from above code shows as: >> 1. overlapped #s caused by unsuitable length of branch. >> 2. no misclassification rates: 'misclass.tree' only brings up the error of ' >> misclassification error rate is appropriate for factor responses only', but >> my response y is 0/1 data. > > If you data is 0/1, you should make it a factor otherwise the cose will > assume you want a regression rather than a classification tree. > > >> 3. Unsuitable location of notations: there are not two notation of splitting >> criteria on the two branches when a node is split, instead only one notation >> of splitting criteria is on the node location. > > It indicates which items go into the left branch. > > Uwe Ligges > > >> thanks, >> xiao yue >> >> >> --------------------------------- >> >> [[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 >> and provide commented, minimal, self-contained, reproducible code. > > > > --------------------------------- > > [[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 > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ [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 and provide commented, minimal, self-contained, reproducible code.
