Type unique(density) How many different unique values does density take? The wiggliness of the smooth term consumes degrees of freedom. That is, the more wiggly your smooth term, the more DFs it consumes. If you get the error you got, you have to reduce the degrees of freedom alloted to the smooth term manually. See ?gam
If however, the unique levels of density are very few, then gam may not be the right way to take anyway. Da. ------------------------- cuncta stricte discussurus ------------------------- -----Ursprüngliche Nachricht----- Von: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] Im Auftrag von Las dA Gesendet: Wednesday, March 04, 2009 1:04 PM An: r-help@r-project.org Betreff: [R] help with GAM Hi I'm trying to do a GAM analysis and have the following codes entered into R (density is = sample number, alive are the successes) density<-as.real(density) y<-cbind(alive,density-alive) library(mgcv) m1<-gam(y~s(density),binomial) at which point I get the following error message Error in smooth.construct.tp.smooth.spec(object, dk$data, dk$knots) : A term has fewer unique covariate combinations than specified maximum degrees of freedom What am I doing wrong? Please help! Thanks! ______________________________________________ R-help@r-project.org 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. ______________________________________________ R-help@r-project.org 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.
