Model for ln ij Number of Parameters Deviance Deviance df (I) Baseline (i.e., 0) 1 90 39 (II) Main effect of the drug A only 2 85 38 (III) Main effect of drug B only 2 84 38 (IV) Main effects of both drug A and drug B 3 40 37 (V) All main effects and interaction 4 30 36 (here is the complete table