Fig. 2

Illustration of the theoretical false positive and theoretical false negative using the normal distribution curve of group-specific scores. Top, the black area represents the cumulative distribution corresponding to the false positives. This is defined as the area under the curve of the blue curve that is to the right of the intercept point of the curves corresponding to the pass/fail cut-off score. Bottom, the black area represents the cumulative distribution corresponding to the false negatives. This is defined as the area under the curve of the orange curve that is to the left of the intercept point of the curves corresponding to the pass/fail cut-off score