Figure 1.

Sample illustration of the change of pair consistency probability C. Lower curves: sample illustration of the probability density functions in the healthy group (f_h) and in the diseased group (f_d); Upper curve: pair consistency probability C (=(1- (α + β)/2)) as a function of cutoff point z. The sum of the two types of errors, α + β, takes a local minimum at the point where f_h and f_d intersect.