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tf-idf weighting

  • The tf-idf weight of a term is the product of its tf weight and its idf weight.

    Wt,d = log(1+ tft,d) x log10(N/dft)

  • Best known weighting scheme in information retrieval

    • Note: the “-” in tf-idf is a hyphen, not a minus sign!

    • Alternative names: tf.idf, tf x idf

  • Increases with the number of occurrences within a document

  • Increases with the rarity of the term in the collection


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