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One option – Jaccard coefficient

  • A commonly-used measure of overlap

  • Let X and Y be two sets; then the J.C. is

  • Equals 1 when X and Y have the same elements and zero when they are disjoint

  • X and Y don’t have to be of the same size

  • Always assigns a number between 0 and 1

    • Now threshold to decide if you have a match

    • E.g., if J.C. > 0.8, declare a match 


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