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Why is accuracy misleading on imbalanced data?

  1. A Always predicting the majority class produces high accuracy while detecting nothing
  2. B Accuracy cannot be computed
  3. C It requires balanced classes
  4. D It only applies to regression
Answer

Always predicting the majority class produces high accuracy while detecting nothing

Precision, recall, F1 and PR-AUC give a meaningful picture when the positive class is rare.

All Data Science MCQs

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