I am running a two-way anova with Type III sums of squares and would like to be able to understand what the different SS mean when I use different contrasts, e.g. treatment contrasts vs helmert contrasts. I have read John Fox's "An R and S-Plus Companion to Applied Regression" approach -p. 140- suggesting that treatment contrasts do not usually result in meaningful results with Type III SS but it's not clear to me why. Any suggestions on a stats text discussing this would be greatly appreciated. Thanks, Mel
-- Menelaos Stavrinides Ph.D. Candidate Environmental Science, Policy and Management 137 Mulford Hall MC #3114 University of California Berkeley, CA 94720-3114 USA Tel: 510 717 5249 ______________________________________________ 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.
