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Term frequency tf

  • The term frequency tft,d of term t in document d is defined as the number of times that t occurs in d.

  • We want to use tf when computing query-document match scores. But how?

  • Raw term frequency is not what we want:

    • A document with 10 occurrences of the term is more relevant than a document with 1 occurrence of the term.

    • But not 10 times more relevant.

  • Relevance does not increase proportionally with term frequency.

  • NB: frequency = count in IR


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