I wonder if this might be better asked on a statistical list -- e.g. stats.stackexchange.com -- as this seems to involve complex statistical model comparison issues, which are normally OT here.
-- Bert Bert Gunter Genentech Nonclinical Biostatistics (650) 467-7374 "Data is not information. Information is not knowledge. And knowledge is certainly not wisdom." Clifford Stoll On Mon, Feb 16, 2015 at 10:13 AM, Arnaud Mosnier <a.mosn...@gmail.com> wrote: > 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. ______________________________________________ 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.