Evaluation

F1 Score

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In Short

The harmonic mean of precision and recall, providing a single metric that balances both concerns.

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F1 score is useful when you need both precision and recall but want a single number for comparison.

Formula

F1 = 2 × (Precision × Recall) / (Precision + Recall)

Limitations

  • Assumes equal importance of precision and recall
  • Can hide important tradeoffs
  • Consider F-beta for weighted balance
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