Dear R group, Simple anova question: I am attempting to recreate a figure (from chapter 10 of "Mordern Statistics for the Life Sciences", chapter 10, figure 10.8). It is an interaction diagram plotting BYIELD (continuous) as a function of BSPACING (categorical) with different lines/colours for another categorical variable BVARIETY. The data is replicated into four categorical BBLOCK(s). The corresponding analysis looks like this: BYIELD~BBLOCK+BSPACING+BVARIETY What I want to extract from this model is simply the expected value all possible combination of factors. I can do this by adding the correct combinations of model coefficients, but this seems silly. Surely there is a one-line function for sorting this sort of thing out? Many thanks, Allen -- View this message in context: http://www.nabble.com/simple-anova-question-tp23528280p23528280.html Sent from the R help mailing list archive at Nabble.com.