Scatterplot of the case risk percentiles (CRPs). The horizontal and vertical coordinates of points give the BCRAT and IBIS CRPs, respectively, for the 83 breast cancer cases. Points above the diagonal line represent cases better identified by IBIS than BCRAT (since their IBIS risk percentiles are higher than their BCRAT risk percentiles). Points below the line correspond to cases better identified by BCRAT than IBIS. The mean CRP for a model is its area under the receiver-operator characteristic curve (AUC). A Wilcoxon signed-rank test of the 83 CRP pairs indicates that the IBIS AUC is significantly different than that of BCRAT (two-tailed P value = (0.04)).