Precision
Fraction of retrieved documents that are relevant to user's information need
Recall
Fraction of relevant documents in collection that are retrieved
F-measure(F-value)
Combined measure that assesses precision/recall tradeoff
This harmonic mean is a conservative average that is appropriate for averaging rate values.
- C: Desired documents that are actually retrieved(제대로 찾은 문서)
- M: Retrieved documents(검색된 문서)
- N: Desired documents(찾으려는 문서)