Which `gam' are you using? If it's mgcv::gam then all the smooth terms are represented using a basis expansion, so it is possible to write down the functional form used. The forms used are given in Chapter 4 of my book (see ?gam for reference). It is also possible for `s' terms (but not `lo' terms) in gam::gam, although you might need to do a little digging into the source code for some of the details of the basis used. However, quite often when people ask for the functional form it is only in order to get at some other quantity, and there turns out to be an easier way to get to it. What were you plan to use the functional form for?
Simon On Monday 16 April 2007 02:13, Jin Huang wrote: > Hi, all, > > Does anyone know how to get the functional form of the smooth terms in > GAM? eg. I fit y=a+b*s(x) where s is the smooth function. > > After fitting this model with GAM in R, I want to know the form of the > s(x). Any suggestion is appreciated. > > Thanks, > Jin > > > --------------------------------- > Ahhh...imagining that irresistible "new car" smell? > > [[alternative HTML version deleted]] > > ______________________________________________ > [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 and provide commented, minimal, > self-contained, reproducible code. -- > Simon Wood, Mathematical Sciences, University of Bath, Bath, BA2 7AY UK > +44 1225 386603 www.maths.bath.ac.uk/~sw283 ______________________________________________ [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 and provide commented, minimal, self-contained, reproducible code.
