Figure 3From: Pearls and perils of an implantable defibrillator trial using a common control: implications for the design of future studiesEfficiency of comparing two interventions, splitting the study wide alpha and beta equally, using the common control design compared to the optimal parallel group design (1:1 allocation) as a function of the allocation ratio 1:1:k across a wide spectrum of Type I (alpha) and Type II (beta) errors.Back to article page