Measurement of non-randomness in spatial distributions |
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Authors: | Roger H. Green |
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Affiliation: | (1) Department of Zoology, University of Queensland, Brisbane, Australia;(2) Present address: Systematics-Ecology Program, Marine Biological Laboratory, Woods Hole, Massachusetts, USA |
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Abstract: | Summary The measurement of departure from randomness in spatial distributions has widespread application in ecological work. Several “indices of non-randomness” are compared with regard to their dependence on sample number, sample size and density. Criteria for the best choice of index for specific situations are discussed. A new coefficientC x is proposed for use with positively contagious distributions and tests of significance are given. WhenC x and another index (S 2/m−1) are used for positive and negative contagion respectively, values ranging from −1 through 0 (random) to +1 are obtained, regardless of sample number, sample size or density. |
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