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)