Hi, Am newish to stats and R, so I certainly appreciate any help. Basically I have 50 inidividuals whom I have 6 photos each of their optic nerve head. I want to check that the orientation of the nerve head is consistent, ie the 6 replicates show minimal or preferably no rotation differences. I'll draw an arbitrary line between some blood vessels (same reference in each set of replicates) and determine an angle of deviation from the vertical and that angle will be my dependent variable.
Subject Replicate Angle of Deviation 1 1 x 1 2 x 1 3 x 1 4 x 1 5 x 1 6 x 2 1 x 2 2 x 2 3 x 2 4 x 2 5 x 2 6 x etc I'm wanting to test for Sphericity (because I've read that you should - is this routine in a repeated measures ANOVA?) and can see that Anova.mlm in the CAR package offers this in addition to the alternative Greenhouse and Feldt tests. I just don't really know how to perform the test - can someone give me some help. Thank you. Paul Dept of Ophthalmology Uni Melbourne, Australia -- View this message in context: http://www.nabble.com/Q-about-how-to-use-Anova.mlm-tp21739443p21739443.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.