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Data Science Academy · Lesson

Pick Metrics for Rare Events

PR curves over plain accuracy.

Choose the Right Yardstick

You already distrust accuracy on imbalance. Now you need metrics that actually reward catching the rare event.

Precision Asks Are We Sure

Precision is the share of flagged positives that are truly positive. High precision means few false alarms among your alerts.

All lessons in this course

  1. Why Accuracy Lies on Imbalance
  2. Resampling: SMOTE and Undersampling
  3. Class Weights and Thresholds
  4. Pick Metrics for Rare Events
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