Harmonic mean of precision and recall; balances sensitivity and positive predictive value
Expansion
F1 Score
Purpose
Single metric for classification performance
Clinical Context
F1 score equals 2 times (precision times recall) divided by (precision plus recall). Useful when false positives and false negatives equally costly.
Related Terms
- Precision
- Recall
Key Points
- F1 score ranges 0 to 1; higher equals better; useful for imbalanced datasets where accuracy misleading