The receiver operator characteristic (ROC) for the OSRE rules’ accuracy on the out-of-sample HIV-1 PR 3261 data set. The triangles show the results for the OSRE HIV-1 PR 746 rules and the circles show the results for the OSRE HIV-1 PR 1625 rules (the five symbols correspond to results using 1, 2, 3, 4, and 5 rules, respectively). The diamonds and stars show the rough set rules’ prediction accuracy, Table III and Fig. 1b in . The diamonds and stars show the results when 1, 2, 3, ..., and 9 rules are used from . The squares and the crosses in the detail Figure, Fig. 4, are the results for Table IV and Fig. 1a in . The dots show the prediction accuracy for the HIVcleave web-server . The solid curve shows the ROC curve for the hitherto best predictor, a linear support vector machine trained on the HIV-1 PR 1625 data set , which does not provide any rules. The dashed diagonal line marks the expected results for random prediction.