Sorensen–Dice coefficient: Difference between revisions
clarification about A ∩ B
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(clarification about A ∩ B) |
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Sørensen–Dice measures the similarity of two groups by dividing twice the intersection token count by the total token count of both groups:
SDC = 2 × |
it being understood that A, B and A∩B are to be understood as multisets, and that if an item, x, has multiplicity a in A and b in B, then it will have multiplicity min(a,b) in A∩B.
The Sørensen–Dice coefficient is thus a ratio between 0.0 and 1.0 giving the "percent similarity" between the two populations.
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