Scrolling below the Performance over Time chart, you will see a Calibration Chart. This chart plots Average Actuals against Estimated Probability. The better calibrated the model, the closer the plotted points will be to the diagonal line. If the model points are below the line, that means the model has over-forecast in its prediction. Fore example, predicted a credit card charge was high probability fraud, when it wasn't. If the model points are above the line, that means the model has under-forecast in its prediction. For example, predicting a credit card charge was low likelihood to be fraudulent when it was in fact fraud.