Dear R-Help list, I want to compare gam models including interaction with simpler models. For interaction models, I used gam(Y~ti(X1) + ti(X2) + ti(X1,X2)) removing the interaction, the models end as Y~ti(X1) + ti(X2)
How those models compare with models with the form Y ~ s(X1) + s(X2) In my case, the former (i.e. ti() ) have a better AIC value than those with s(). Should I keep the ti() form or use only the s() form when I have no interaction ? Thanks for your help ! Arnaud [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.