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Line 26: SDC = 2 × \|A∩B\| / (\|A\| + \|B\|) ~~it being understood that~~where 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.

Sorensen–Dice coefficient (view source)