Fig. 3From: Optimal futility stopping boundaries for binary endpointsProbability of early termination under the null hypothesis \(p_0\) for \(p_a-p_0 = 0.15\), \(\alpha = 0.05\), and \(\beta = 0.2\). PET(\(p_0\)) corresponds to the probability of correctly stopping for futility at the interim analysisBack to article page