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Recap: tf-idf weighting

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

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

  • Best known weighting scheme in information retrieval

  • Increases with the number of occurrences within a document

  • Increases with the rarity of the term in the collection



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