I'm by no means expert in such matter, but where did you get the idea that such manipulation is needed? If you center the response by its mean, that's the same as taking out the intercept. There's no reason to do that beforehand. As to centering by median, that's a first for me, and quite frankly I don't see what it buys you.
Andy > From: Martin Julien > > I want to fit a linear mixed-model with my data but I want to > know if I have > to center all my responses variables on their median and why > I have to do > it? > > Thank > > Julien Martin > > > > > [[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 > > ______________________________________________ [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
