Actual Value
Positive Negative
Predicted Value Predicted Positive True positive (TP) False positive (FP)
Predicted Negative False negative (FN) True negative (TN)

  • TP: hit

  • TN: correct rejection

  • FP: false alarm, Type I error

  • FN: miss, Type II error

相关计算：

accuracy (ACC)

ACC = (TP + TN) / (TP + TN + FP + FN)

sensitivity, recall, hit rate or true positive rate (TPR)

TPR = TP / (TP + FN)

miss rate or false negative rate (FNR)

FNR = FN / (TP + FN) = 1 - TPR

specificity, selectivity or true negative rate (TNR)

TNR = TN / (TN + FP)

fall-out or false positive rate (FPR)

FPR = FP / (TN + FP) = 1 - TNR

precision or positive prediction value (PPV)

PPV = TP / (TP + FP)

false discovery rate (FDR)

FDR = FP / (TP + FP) = 1 - PPV

negative prediction value (NPV)

NPV = TN / (TN + FN)

false omission rate (FOR)

FOR = FN / (TN + FN) = 1 - NPV

F1 score

harmonic mean of precision and sensitivity

F1 = 2 * (PPV * TPR) / (PPV + TPR) = 2TP / (2TP + FP + FN)