Dear Katrina, You might look to the Anova() function (capital "A") in the "car" library by John Fox; it does Type II SS. There a few other helpful functions to streamline analyses and make pretty pictures.
Best, Jesse Dept. of Environmental and Forest Biology, SUNY-ESF 248 Illick Hall, 1 Forestry Dr., Syracuse, NY 13210 USA phone: 315.470.4937 fax: 315.470.6934 email: [EMAIL PROTECTED] http://www.esf.edu/efb/brunner/ > Message: 2 > Date: Thu, 13 Nov 2008 10:08:46 +0100 > From: "ONKELINX, Thierry" <[EMAIL PROTECTED]> > Subject: Re: [R-sig-eco] ANOVA Output > To: <[EMAIL PROTECTED]>, <r-sig-ecology@r-project.org> > Message-ID: > <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="us-ascii" > > Dear Katrina, > > The F-value are different because you test different hypotheses since > anova yields Type I SS. It looks like you expect Type III SS. > > HTH, > > Thierry > > > ------------------------------------------------------------------------ > ---- > ir. Thierry Onkelinx > Instituut voor natuur- en bosonderzoek / Research Institute for Nature > and Forest > Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, > methodology and quality assurance > Gaverstraat 4 > 9500 Geraardsbergen > Belgium > tel. + 32 54/436 185 > [EMAIL PROTECTED] > www.inbo.be > > To call in the statistician after the experiment is done may be no > more > than asking him to perform a post-mortem examination: he may be able > to > say what the experiment died of. > ~ Sir Ronald Aylmer Fisher > > The plural of anecdote is not data. > ~ Roger Brinner > > The combination of some data and an aching desire for an answer does > not > ensure that a reasonable answer can be extracted from a given body of > data. > ~ John Tukey > >> -----Oorspronkelijk bericht----- >> Van: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] Namens Katrina W. Chu >> Verzonden: woensdag 12 november 2008 22:27 >> Aan: r-sig-ecology@r-project.org >> Onderwerp: [R-sig-eco] ANOVA Output >> >> I have a question about my R-output when I run a three-way ANOVA. I >> just plugged in the >> interaction term into the formula and presto! ANOVA! But I noticed >> that if I change >> the order of the formula (or interaction term), I get slightly >> different >> ANOVA outputs. >> I've pasted the output at the bottom of this message. I didn't >> think >> that this should >> happen, so I would appreciate if anyone had any feedback on this >> problem. >> >> Thanks in advance, Kat. [[alternative HTML version deleted]] _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology
