Receiver operating characteristic curve

A curve representing the relationship between sensitivity (true positive fraction and 1 – specificity (false positive fraction) in the case of a continous test result. It displays the trade-offs between sensitivity and specificity when the cut-off value for a positive test result is varied. The measure used to determine the overall accuracy of a test using the ROC curve is known as the area under ROC curve (AROC). In general, an AROC of 0.5–0.7 is associated with a marginally useful test, of 0.7–0.9 with a good test, and of greater than 0.9 with an excellent test.