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Patterns In NatureThe Analysis of Species Co-Occurrences$
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Patterns In Nature: The Analysis of Species Co-Occurrences

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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PRINTED FROM CHICAGO SCHOLARSHIP ONLINE (www.chicago.universitypressscholarship.com). (c) Copyright University of Chicago Press, 2022. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CHSO for personal use.date: 25 June 2022

How to Fill the Sample Null Space

How to Fill the Sample Null Space

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

James G. Sanderson

Stuart L. Pimm

Publisher:
University of Chicago Press
DOI:10.7208/chicago/9780226292861.003.0005

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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