Fig. 2From: Comparison of Bayesian and frequentist group-sequential clinical trial designsStopping boundaries for Bayesian sequential tests with 5 looks using prior distributions from Figure 1 (∘). Solid lines give boundaries for O’Brien and Fleming test (steep sloping lines), Pocock test (horizontal lines) and for frequentist test with α∗(t)=αt (shallow sloping lines)Back to article page