Dear Mark, -------------------------------- John Fox, Professor Department of Sociology McMaster University Hamilton, Ontario Canada L8S 4M4 905-525-9140x23604 http://socserv.mcmaster.ca/jfox --------------------------------
> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Leeds, Mark (IED) > Sent: Wednesday, October 03, 2007 5:49 PM > To: [EMAIL PROTECTED] > Subject: [R] Forcing zero intercept in two predictor case - > stat questionnot R question > > When one is doing simple regression and needs to force a zero > intercept ( for whatever reason. I realize it's a > controversial issue ), then subtracting the means of the left > hand side and the right hand side from themselves does the > trick. Does anyone know if there is a similar trick when the > RHS has two variables ? Thanks. Yes, express all three variables as deviations from their means. (This follows from the observation that the LS regression surface goes through the centroid of the variables.) Regards, John ______________________________________________ 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.
