Table 2.

Definitions of evaluation metrics

Performance measures	Definitions
Precision	TP/(TP + FP)
Specificity/true negative rate (TNR)	TN/(TN + FP)
Sensitivity/true positive rate (TPR) or Recall	TP/(TP + FN)
Accuracy	(TP + TN)/(TP + TN + FP + FN)
F-measure	(2 × Precision × Recall)/ (Precision + Recall)

^*True positive (TP), true negative (TN), false positive (FP), false negative (FN)