Dear Bob, Take a look at the effects package, described in <http://www.jstatsoft.org/v08/i15/paper>.
I hope this helps, John ------------------------------ John Fox, Professor Department of Sociology McMaster University Hamilton, Ontario, Canada web: socserv.mcmaster.ca/jfox > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On > Behalf Of Robert Michael Inman > Sent: January-19-09 8:17 AM > To: r-help@r-project.org > Subject: [R] termplot > > I have used glm and stepAIC to choose a best model. I can use termplot to > assess the contribution of each explanatory variable in the glm. However > the final model after running stepAIC includes interaction terms, and when I > do termplot I get "Error in `[.data.frame`(mf, , i) : undefined columns > selected". I also see the termplot detail saying "Nothing sensible happens > for interaction terms." > > Is it possilbe to determine explanatory power of final set of variables when > interactions are included? > > Thanks > > - Bob > > ______________________________________________ > 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.
