On Thu, 2007-10-11 at 10:24 -0700, Menelaos Stavrinides wrote: > 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
A good place to start would be Prof. Venables' "Exegeses on Linear Models": www.stats.ox.ac.uk/pub/MASS3/Exegeses.pdf Searching the r-help archives will also yield many discussions. Also, see R FAQ 7.18. HTH, Marc Schwartz ______________________________________________ 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.
