The Receiver Operating Characteristic curve is a useful summary of how well the full logistic regression model functions as a predictor of outcome.

http://en.wikipedia.org/wiki/Receiver_operating_characteristic

## Dialog

**Predictive Probabilities** displays the empirical probability of the model correctly classifying the data at each point on the ROC curve.
**Diagonal Line** Displays a red diagonal line indicating the ROC curve associated with randomly guessing.
**AUC** or Area Under the Curve is a single numerical measure of predictive power.