Plots depicting effects of increasing the minimum membership probability upon the purity and completeness of the selected sample of a group. For each group (panel), increasing the probability cut on membership probability (x-axis) increases the purity of the selected group, but decreases the completeness (y-axis). We plot the true purity and completeness, and the expected purity and completeness calculated from the probability distribution. For groups that show evidence of being phase-clumped, we also plot the purity and completeness calculated without the additional phase considerations (see Sect. 4.2).