Precision vs. recall trade-off plot resulting after evaluation on test set for three different bootstrapped iterations. Blue lines correspond to PMS classification and grey lines to classical Be classification. Different probability thresholds (p) for selecting candidate objects correspond to different locations on the line. Upwards arrows (p ≥ 75%), circles (p ≥ 50%), and downwards arrows (p ≥ 25%) are examples of such probability thresholds. Some lines do not cover the whole metric space because evaluation stops whenever there are no longer true positives in the corresponding test set. The precision values are lower limits to the real precisions.