Confusion Matrix

True Positive 中的Positive，指的是预测为Positive。

Evaluation Metric

precision, positive predictive value (PPV)

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

specificity, selectiveity, true negative rate (TNR)

accuracy (ACC)

F1 score

is the harmonic mean of precision and recall.

Decide Which ML Method Would Be Best

We can use sensitivity and specificity to help us decide which machine learning method would be best for our data.