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Issues with Jaccard for scoring

  • It doesn’t consider term frequency (how many times a term occurs in a document)

  • Rare terms in a collection are more informative than frequent terms. Jaccard doesn’t consider this information

  • We need a more sophisticated way of normalizing for length

  • Later in this lecture, we’ll use 

  • . . . instead of |A ∩ B|/|A ∪ B| (Jaccard) for length normalization.

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