search for: watercont

...I realize that if I just use aov() to perform a two-way ANOVA the order in which the terms ("oxygen content" and "medium") are entered will give different results because of the sequential SS. What I have done in the past is utilize drop1() in conjunction with aov() drop1(aov(WaterContent~Oxygen*Medium, data), test="F") to see if the interaction term was significant (F, p-value) and if its inclusion improved model fit (AIC). If from this I determine that the interaction term can be removed and the model can be rerun without it, I am able to test for main-effects and ge...