Dear Erika et al., I'm not sure exactly what you want to do, but you might take a look at the Anova() function in the car package, which will compute "type-II" or "type-III" tests for multivariate linear models, including models with repeated measures; you can also get the traditional univariate tests. Be very careful of Type-III tests, especially if the covariate is involved in interactions, since it's very easy to test strange hypotheses (as is true even in a univariate context). There are some examples of repeated-measures ANOVAs and MANOVAs in ?Anova.
I hope this helps, John ------------------------------ John Fox, Professor Department of Sociology McMaster University Hamilton, Ontario, Canada web: socserv.mcmaster.ca/jfox > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of hadley wickham > Sent: September-10-08 8:53 PM > To: Erika Crispo > Cc: r-help@r-project.org > Subject: Re: [R] mixed model MANCOVA > > On Mon, Sep 8, 2008 at 1:06 PM, Erika Crispo > <[EMAIL PROTECTED]> wrote: > > Hello, > > > > I need to perform a mixed-model (with nesting) MANCOVA, using Type III sums > of squares. I know how to perform each of these types of tests individually, > but I am not sure if performing a mixed-model MANCOVA is possible. Please let > me know. > > Why? What is the purpose of your analysis? Why do you think a > mixed-effects MANCOVA is appropriate? What have simpler models told > you about the data? What exploratory graphics have you done? > > Hadley > > > -- > http://had.co.nz/ > > ______________________________________________ > 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. ______________________________________________ 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.
