> BTW, although I didn't read it carefully, the your web-page description of a > main effect in the presence of an interaction appears to imply that this > averages across all individuals, when in fact it averages across the levels > of the other factor; the result is different when there are unequal numbers > of observations in the cells. As well, you describe the model in your email > as an ANCOVA, when in fact it appears to be a two-way ANOVA.
And why not show the raw data on the model summary plots? That way you could spot potential outliers, or skewness etc. Hadley -- http://had.co.nz/ ______________________________________________ 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.
