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What does the F1 score represent?

  1. A The harmonic mean of precision and recall
  2. B The average of precision and accuracy
  3. C The area under the ROC curve
  4. D The ratio of true to false positives
Answer

The harmonic mean of precision and recall

The harmonic mean penalises imbalance between the two, so a model with high precision and near-zero recall scores poorly.

All Machine Learning MCQs

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