Figure 2.

All possible power functions for UMP‐tests in the situation $n_{\text{ped}}=40$, varying the threshold b for the observed number of responders, or equivalently the threshold c for the posterior probability. The values of $p_{\text{true}}=.2$ and $\alpha =.05$ are indicated as vertical and horizontal gray lines and the power curve for $b=13$, corresponding to the 5% level UMP test, is indicated in dashed red