ROC curve 1.0 四≥2 0 A A 巴≥=00 0.6 0.4 0.4 0.2 0.60.81.0 0.2 False positive rate False Positive rate ROC curves show the tradeoff between sensitivity and specificity The closer the curve follows the upper -left border of the Roc space the more accurate the test The closer the curve comes to the 45-degree diagonal of the roc space the less accurate the test a common method is to calculate the area under the roc curveROC curve ◼ ROC curves show the tradeoff between sensitivity and specificity. ◼ The closer the curve follows the upper –left border of the ROC space, the more accurate the test. ◼ The closer the curve comes to the 45-degree diagonal of the ROC space, the less accurate the test. ◼ A common method is to calculate the area under the ROC curve