A point on the positive diagonal on an ROC curve indicates which of the following:
A) extremely high sensitivity
B) a low criterion setting
C) chance responding; i.e., zero sensitivity)
D) optimal beta

Question

Quizplus · Accepted Answer

A point on the positive diagonal of an ROC (Receiver Operating Characteristic) curve represents a situation where the true positive rate equals the false positive rate, indicating that the model's predictions are no better than random chance. This is referred to as chance responding or zero sensitivity, as the model does not effectively discriminate between the classes more accurately than flipping a coin would.

A Point on the Positive Diagonal on an ROC Curve