Scoring & evidence
F1 score
A combined measure of precision and recall.
Also known as: F1
Definition
F1 is the harmonic mean of precision and recall, balancing false positives against missed relevant results.
Why it matters
It is useful for extraction and classification, but the business costs of false positives and false negatives may not be equal.
Related concepts
- Metric
A defined quantity used to assess an aspect of performance.
- False positive
A system flags something as present or risky when it is not.
- False negative
A system misses something that is genuinely present or risky.