IDF Score

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A IDF Score is non-negative real numeric score from an IDF function.

  • Context:
  • Example(s):
    • [math]\displaystyle{ 0 }[/math], when every multiset contains the member.
    • [math]\displaystyle{ 2.301... }[/math], for [math]\displaystyle{ \operatorname{idf}(``\text{quaint}'', \text{Newsgroups 20 corpus}) }[/math], i.e. [math]\displaystyle{ \log(200) \equiv \log(\frac{8,000}{40}) }[/math], if the word quaint is contained in 40 documents from a corpus with 8,000 documents.
    • [math]\displaystyle{ \log(\mid C \mid) }[/math], when only one multiset contains the member.
  • Counter-Example(s):
  • See: TF Score, Vocabulary Member.


References