From: Gavin Simpson > > On Tue, 2006-06-20 at 08:12 -0700, Scott Rollins wrote: > > Glenn De'ath published a paper in 'Ecology' several years ago and > > included S-Plus functions in the archives. I haven't looked at the > > files, so I'm not sure what modifications would be necessary for R. > > > > De'ath, G. 2002. Multivariate regression trees: a new technique for > > modeling species--environment relationships. Ecology 83:1105-1117. > > > > Archives: http://www.esapubs.org/archive/ecol/E083/017/ > > > > Scott > > Glenn's code is in package mvpart on CRAN. > > Not sure if the OP wanted this or not, but the multivariate > nature of mvpart is in allowing multivariate responses, > common in ecological data analysis. The fitting is still done > using rpart (actually a modified version of rpart to allow > for the multivariate response). > > Gavin
The OP's reply to my follow-up to Torsten's message seems to indicate that he has univariate response. He wants something that can split on linear combinations of predictors, as described in the CART book, I believe. What I thought he wanted was something that finds some optimal subset of predictors to split each node. I am not aware of any open source implementations of tree algorithms that does linear combination splits, perhaps others know better. I suppose Torsten's double bagging (in the ipred package) sort of does that, but in an ensemble rather than a single tree. Andy > > > > > > > Date: Mon, 19 Jun 2006 16:17:40 +0200 > > > From: " B?lint Cz?cz " <[EMAIL PROTECTED]> > > > Subject: [R] multivariate splits > > > To: r-help <r-help@stat.math.ethz.ch> > > > Message-ID: <[EMAIL PROTECTED]> > > > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > > > > > Dear R users! > > > > > > Does someone know about any algorithms / packages in R, > that perform > > > classification / regression / decision trees using multivariate > > > splits? > > > > > > I have done some research, but I found nothing. Packages > "tree" and > > > "rpart" seem only to be able to do CART with univariate splits. > > > > > > Thank you for your help! > > > > > > B?lint > > > > > > -- > > > Cz?cz B?lint > > > PhD hallgat? > > > BCE KTK Talajtan ?s V?zgazd?lkod?s Tansz?k > > > 1118 Budapest, Vill?nyi ?t 29-43. > > > > > > --------------------------------- > > > > > > [[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 > > ______________________________________________ > 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 > > ______________________________________________ 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
