On Wed, 2006-04-19 at 21:18 +0200, Marco Girardello wrote: > Hi, > > is there an R function which can compute the R-squared > for a mars model fitted using the mda package? > > many thanks in advance > > best regards > > Marco Girardello
Julian Faraway's "Extending the Linear Model with R" Chapman & Hall/CRC (page 248)has a small section on MARS and compares the MARS fit with other methods by using the MARS basis functions in a linear model to get an R^2: # page 248 example library(faraway) library(mda) data(ozone) a <- mars(ozone[,-1], ozone[,]) (a.summ <- summary(lm(ozone[,1] ~ a$x-1))) a.summ$r.squared HTH G -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% *Note new Address and Fax and Telephone numbers from 10th April 2006* %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Gavin Simpson [t] +44 (0)20 7679 0522 ECRC [f] +44 (0)20 7679 0565 UCL Department of Geography Pearson Building [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street London, UK [w] http://www.ucl.ac.uk/~ucfagls/cv/ WC1E 6BT [w] http://www.ucl.ac.uk/~ucfagls/ %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% ______________________________________________ [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
