Table 2. Model performance at optimal threshold using Youden’s J index.

A 2x2 confusion matrix for the optimal threshold showing physician-month counts and B classification performance statistics. PPV is Positive Predictive Value; NPV is Negative Predictive Value. F1 is the harmonic mean of PPV and Sensitivity.

A				B
		Predicted		Metric	Value
		Retained	Departed	Sensitivity	0.64
				Specificity	0.79
Ground Truth	Retained	1523	397	PPV	0.07
				NPV	0.99
	Departed	17	30	F1	0.86
				Accuracy	0.97