On 11-03-16 07:55 PM, Peter Ehlers wrote: > On 2011-03-16 15:02, Ben Bolker wrote: >> <JLucke<at> ria.buffalo.edu> writes: >> >>> >>> lm(y~x+0) yields the regression on x without the constant, i.e., y=bx+e, >>> not y = a +e >>> >>> derek<jan.kacaba<at> gmail.com> >>> Sent by: r-help-bounces<at> r-project.org >>> 03/16/2011 03:49 PM >>> >> >> Would someone like to (please!) write this up and submit it to >> Kurt Hornik for inclusion in the R FAQ? > > Not to belittle Joseph's succinct comment, but I think > that it's more precise to say that the model through > the origin is regression with an intercept fixed at zero > rather than "without the constant". This seems to me > to be a crucial distinction here and Thomas' post made > that point very eloquently with: > > "If you don't know a priori that E[Y]=0 when x=0 > you shouldn't be fitting a line through the origin." > > Peter Ehlers
I didn't mean this particular comment: I meant as long a discussion of the topic as seems appropriate for the FAQ. ______________________________________________ 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.
