Basic regression model question.
Suppose I treated 3 groups of mice, group 1 with water, group 2 with drug A, and group 3 with drug B. The water treatment thus serves as baseline.
Now my question is what is a more appropriate linear model to use in order to assess the effect of each drug relative to the water treatment:
Do 2 pairwise comparisons: A vs. water and B vs. water?
Use a linear model:
response ~ treatment, where the levels in
treatmentare: water, A, and B with dummy coding.