Biggerstaff method for comparing case-management strategies. The blue diamond shows the positive management rate plotted against 1- negative management rate for the control group in . The red square shows the estimate of PMR and 1- NMR for the enhanced training group. Dotted red lines show equivalent PMR and NMR. The upper left rectangle (upward shading) shows the region where a strategy would be considered superior both in term of NMR and PMR; the lower right quadrant (downward shading) shows the region where a new strategy would be considered inferior in terms of NMR and PMR. The solid black line shows the line of constant likelihood ratio for positives, and the dashed black line shows the line of constant likelihood ratio for negatives. The blue shaded area shows the region where an alternative strategy would be considered superior on the basis of higher LR+ and lower LR-, as discussed in Biggerstaff .