No luck as in...? What error did you encounter? In your example data set, you only have 2 levels of each within-Ss factor, in which case you shouldn't expect to obtain tests of sphericity; as far as I understand it, sphericity necessarily holds when for repeated measures with only 2 levels and tests are really only possible for repeated measures with 3 or more levels.
I think it's analogous to how you don't need to test homogeneity of variance when performing a paired t-test; the test ends up representing the pairs as single distribution of difference scores with a single variance. Mike On Mon, Nov 9, 2009 at 5:30 PM, Sergios (Sergey) Charntikov <sergios...@gmail.com> wrote: > Tried EZanova, no luck with my particular dataset. > > > Sincerely, > > Sergios Charntikov (Sergey), MA > > Behavioral Neuropharmacology Lab > Department of Psychology > University of Nebraska-Lincoln > Lincoln, NE 68588-0308 USA > > > > > On Mon, Nov 9, 2009 at 2:25 PM, Mike Lawrence <mike.lawre...@dal.ca> wrote: >> >> Have you tried ezANOVA from the ez pacakge? It attempts to provide a >> simple user interface to car's ANOVA (and when that fails, aov). >> >> On Mon, Nov 9, 2009 at 1:44 PM, Sergios (Sergey) Charntikov >> <sergios...@gmail.com> wrote: >> > Hello everyone, >> > >> > I am trying to do within subjects repeated measures anova followed by >> > the >> > test of sphericity (sample dataset below). >> > I am able to get either mixed model or linear model anova and TukeyHSD, >> > but >> > have no luck with Repeated-Measures Assuming Sphericity or Separate >> > Sphericity Tests. >> > I am trying to follow example from "car" package, but it seems that I am >> > not >> > getting something right. >> > >> >> Dataset$Sessn <- as.factor(Dataset$Sessn) >> > >> >> LinearModel.1 <- lm(Response ~ Sessn*Trtmt, data=Dataset) >> > >> >> summary(LinearModel.1) >> > >> > All, good so far, but I have problem understanding "idata=" and >> > "idesign=" >> > functions pertaining to my example. Session is my repeated measure >> > (Sessn 1 >> > and Sessn 2 = two sessions, in reality I have more) and it is already >> > stacked. Any help or guidance on this matter. >> > >> > Thank you, my mock dataset is below. Each subject has two levels of >> > treatment throughout four calendar days which are recoded to Session 1 >> > and >> > Session 2 in order to compare treatments by the first and subsequent >> > days of >> > exposure (Treatment x Session; my DV is Response; Session is repeated). >> > >> > Subj Trtmt Sessn Response 1 N 1 5 1 D 1 6 1 N 2 4 1 D 2 7 2 N 1 >> > 8 >> > 2 D 1 9 2 N 2 2 2 D 2 1 3 N 1 4 3 D 1 5 3 N 2 6 3 D 2 2 4 N 1 5 >> > 4 D >> > 1 6 4 N 2 4 4 D 2 7 5 N 1 8 5 D 1 9 5 N 2 2 5 D 2 1 6 N 1 4 6 D >> > 1 5 >> > 6 N 2 6 6 D 2 2 >> > >> > Sincerely, >> > >> > Sergios Charntikov (Sergey), MA >> > >> > Behavioral Neuropharmacology Lab >> > Department of Psychology >> > University of Nebraska-Lincoln >> > Lincoln, NE 68588-0308 USA >> > >> > sergioschr-at-gmail-dot-com >> > >> > [[alternative HTML version deleted]] >> > >> > ______________________________________________ >> > 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. >> > >> > >> >> >> >> -- >> Mike Lawrence >> Graduate Student >> Department of Psychology >> Dalhousie University >> >> Looking to arrange a meeting? Check my public calendar: >> http://tr.im/mikes_public_calendar >> >> ~ Certainty is folly... I think. ~ > > -- Mike Lawrence Graduate Student Department of Psychology Dalhousie University Looking to arrange a meeting? Check my public calendar: http://tr.im/mikes_public_calendar ~ Certainty is folly... I think. ~ ______________________________________________ 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.