[EMAIL PROTECTED] wrote: > Dear All, > > I've a question about scaling the input variables for an analysis with svm > (package e1071). Most of my variables are factors with 4 to 6 levels but > there are also some numeric variables. > > I'm not familiar with the math behind svms, so my assumtions maybe completely > wrong ... or obvious. Will the svm automatically expand the factors into a > binary matrix? If I add numeric variables outside the range of 0 to 1 do I > have to scale them to have 0 to 1 range?
Well, this depends on the kernel in use. For radial basis functions (as an example), you do not have to rescale, but a transformation of variables might make sense in order to get better results, though. Uwe Ligges > > thanks a lot for help, > > +kind regards, > > Arne > > ______________________________________________ > [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 ______________________________________________ [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
