Table 2.

Performance measures for binary classification based on the notation in Table 1.

Performance Measure	Formula
Number of misclassifications (NMC)	$FP+FN$
Accuracy	$\frac{TP+TN}{TP+FN+FP+TN}$
Sensitivity	$\frac{TP}{TP+FN}$
Specificity	$\frac{TN}{FP+TN}$
Area under the receiver operator curve (AUC)	$\frac{1}{2}\left(\frac{TP}{TP+FN}+\frac{TN}{FP+TN}\right)$