A classification model's precision and recall can change when its decision threshold changes. A default threshold is not necessarily the optimal choice for every machine learning application. When evaluating a machine learning classification model, accuracy alone does not always tell the complete story. Imagine an email spam detector that correctly classifies 98% of emails. That sounds impressive. But what if it incorrectly sends important customer emails to the spam folder? Or imagine a disease detection model that finds almost every patient who may have a disease, but also incorrectly flags many healthy patients. This is where precision and recall become important. Precision and recall are two of the most useful metrics for understanding classification models. They are closely connected to the true positives, false positives, and false negatives found in a confusion matrix. If you are new to confusion matrices, start with Mastering the Confusion ...
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