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Patterns In NatureThe Analysis of Species Co-Occurrences$
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James G. Sanderson and Stuart L. Pimm

Print publication date: 2015

Print ISBN-13: 9780226292724

Published to Chicago Scholarship Online: May 2016

DOI: 10.7208/chicago/9780226292861.001.0001

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How to Fill the Sample Null Space

How to Fill the Sample Null Space

(p.73) Chapter Five How to Fill the Sample Null Space
Patterns In Nature

James G. Sanderson

Stuart L. Pimm

University of Chicago Press

Chapter 5 describes how sample random, or null, matrices are created so that each is representative of the actual, or observed, incidence matrix. Four different methods, or algorithms, to create each null matrix are described: enumeration, swap, construction, and quasi-swap. The quasi-swap method produces a collection of null matrices that is representative of the full null space and samples the full null space uniform-random

Keywords:   algorithm, construction, enumeration, full null space, quasi-swap, sample null space, swap

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