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The slide represents a ROC -“Receiver, Operating Characteristic Curve”. It combines on one picture the effect of differing sensitivities and specificities. Specificity is shown as increasing to the left at the top of the picture and 1- (one minus) specificity increasing to the right at the bottom. This is the custom except that the labeling is usually on the bottom. The ROC does show that it is usual for the sensitivity of a test to increase as the specificity decreases. The ROC curve is best when the line is curved as shown. The dotted line shows the relationship for a test that produced random results