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A fast and unbiased procedure to randomize ecological binary matrices with fixed row and column totals
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Introduces the Curveball algorithm for randomizing presence-absence matrices without altering row and column totals, and reports that it samples the set of matrix configurations uniformly at far lower computational effort than earlier swap methods. The fixed-margin null of §5.3 uses its trade: two rows exchange a random part of the entries only one of them holds.
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