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. 2019 Mar 15;14(3):e0200458. doi: 10.1371/journal.pone.0200458

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© 2019 Cougoul et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 1 — For the occurrence data: the testability zones defined by OTU prevalence for the Fisher’s exact test (A), and the proportion of testable associations as a function of N assuming prevalence follows a uniform distribution (B). Testability zones defined by OTU prevalence for the Phi coefficient (C), and the proportion of testable associations as a function of N assuming prevalence follows a uniform distribution (D). For the read abundance data: testability zones defined by OTU prevalence for the Pearson and Spearman correlation coefficients (E), and the proportion of testable associations as a function of N assuming prevalence follows a uniform distribution (F). The alpha level for the tests was 5%. For (A), (C) and (E), N = 50.