On Mon, 22 Jan 2007, Paul Smith wrote: > Dear All > > I would like to use rpart to obtain a regression tree for a dataset > like the following: > > Y X1 X2 X3 X4 > 5.500033 B A 3 2 > 0.35625148 D B 6 5 > 0.8062546 E C 4 3 > 5.100014 C A 3 2 > 5.7000422 A A 3 2 > 0.76875436 C A 6 5 > 1.0312537 D A 4 1 > > Y is the objective variable. X1, X2, X3 and X4 can take, respectively, > the following values: > > X1: A,B,C,D,E > X2: A,B,C,D,E > X3: 3,4,5,6 > X4. 1,2,3,4,5 > > Should I convert X3 and X4 to factor before running rpart?
If they really are factors, yes. If they are ordered factors, no. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.
