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...= "III")? How do anova() and Anova() handle incomplete designs, and how can interactions of variables with missing levels be interpreted? I realize these are fairly broad questions, but any insight would be helpful. Thanks, all. Below is code to illustrate my question(s): > lmMass <- lm(log(l.mass) ~ day*leaf.species + cond.time, data = growth.data) #lm() without cond.time interactions > lmMassInt <- lm(log(l.mass) ~ day*leaf.species*cond.time, data = growth.data) #lm() with cond.time interactions > anova(lmMass); anova(lmMassInt) #ANOVA summary...