首先寫出confusion matrix。
常見指標
accuracy = (TP + TN) / (TP + TN + FN + FP)
precision = TP / (TP + FP)
recall = TP / (TP + FN)
誤報率 = false alarm rate = false positive rate = FP / (FP + TN)
漏報率 = false negative rate = FN / (TP + FN)
靈敏度 = sensitivity = true positive rate = recall = TP / (TP + FN)
特異度 = specificity = false positive rate = 誤報率 = FP / (FP + TN)
ROC曲線
ROC曲線的縱軸是true positive rate,縱軸是false positive rate。曲線集中在左上角比較好一點。
PR曲線
PR曲線的縱軸是precision,橫軸是recall。曲線集中在右上角比較好一點。