Dear Dani, I'll address your questions briefly below. They aren't unique to GAMs.
> -----Original Message----- > From: R-help [mailto:[email protected]] On Behalf Of dani > Sent: Thursday, August 30, 2018 12:47 PM > To: [email protected] > Subject: [R] standardized regression coefficients in GAM > > Hello everyone, > > > I was wondering if anyone can help me calculate standardized regression > coefficients from a GAM model. > > I have some dummy and some continuous covariates in my GAM model. I > know I could standardize only the continuous covariates and re-run the model > to get the standardized coefficients. Can anyone help with some R code to > create the standardized coefficients after obtaining a GAM model based on > unstandardized coefficients? Why one would want to do this isn't clear to me, but you can just multiply each such coefficient by the standard deviation of the corresponding X and divide by the standard deviation of Y. > > > Also, on a separate note, what do I do with the dummy covariates - should I > just include them as they are in the model with standardized variables? I do > not see how I can standardize dummy variables. Standardizing dummy regressors is nonsense, so don't do it. If there are interaction regressors in your model, don't standardize those either. I hope this helps, John ----------------------------------------------------------------- John Fox Professor Emeritus McMaster University Hamilton, Ontario, Canada Web: https://socialsciences.mcmaster.ca/jfox/ > > > Thank you! > > Best, > > Dani > > <http://aka.ms/weboutlook> > > [[alternative HTML version deleted]] > > ______________________________________________ > [email protected] 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. ______________________________________________ [email protected] 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.
