Prof Brian Ripley <[EMAIL PROTECTED]> writes: > A multistratum aov() fit is just a list of aov() fits, so you can apply > functions such as Anova to the individual strata. > > However, why do you want types II and III sums of squares? It is usual > to do this type of analysis only with balanced designs. In the cases I > can envisage that these make any sense, they are the same as type I > (and in cases with only one treatment effect, they always are).
I was about to make a similar comment. A possible exception is ANCOVA where you likely want to test both the within-stratum effect of a covariate and the effect of design factors adjusted for the covariate. > On Tue, 8 Nov 2005, Jarrett Byrnes wrote: > > > I've recently run into the problem of using aov with nested factors, > > and wanting to get the type II and III sums of squares. Normally Anova > > from the car package would do fine, but it doesn't like having an Error > > included, so > > > > my.aov <-aov(Response ~ Treatment + Error(Treatment:Replicate)) > > Anova(my.aov, type="II") > > > > yields > > > > Error in Anova(nested.anova) : no applicable method for "Anova" > > > > And lm does not take Error as an argument. > > Nor does log()! Is that relevant? > > > Error in eval(expr, envir, enclos) : couldn't find function "Error" > > > > Is there a way to get these additional types of sums of squares when > > Error is included in an aov model? > > Have you read the reference on the aov help page? That might be a good > step to deepening your understanding of what Error() does. > > -- > Brian D. Ripley, [EMAIL PROTECTED] > Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ > University of Oxford, Tel: +44 1865 272861 (self) > 1 South Parks Road, +44 1865 272866 (PA) > Oxford OX1 3TG, UK Fax: +44 1865 272595 > > ______________________________________________ > [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 > -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [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
