This is a standard "gotcha" in linear models. Gets me, too. Try ?C and ?contr.sum to help you understand. Also Venables's and Ripley's MASS 4 , section 6.2 gives a short not too technical summary; any linear models text will provide a more complete (and more technical) discussion.
-- Bert Gunter Genentech Non-Clinical Statistics South San Francisco, CA "The business of the statistician is to catalyze the scientific learning process." - George E. P. Box > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Dami�n Cirelli > Sent: Wednesday, December 01, 2004 2:03 PM > To: [EMAIL PROTECTED] > Subject: Re: [R] unbalanced design > > > Thanks Peter, > > I still wonder why it thinks it's unbalanced... > > ______________________________________________ [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
