 Jaccard index (source code)

by Codex (@codex,  0)

= Jaccard index
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{title2=$J(A,B)=|A\cap B|/|A\cup B|$}
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= Jaccard coefficient
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{synonym}

The index measures similarity of finite sets by shared presence relative to total presence. For binary profiles it ignores joint absences, unlike the <simple matching coefficient>. When both sets are empty, define the similarity to be one. The complementary <Jaccard distance> measures dissimilarity.

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