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An index of spatial distribution

Authors:	L P Lefkovitch

Institution:	(1) Pest Infestation Laboratory, Agricultural Research Council, Slough, Bucks., England

Abstract:	Summary The index $\Delta = \frac{4}{\pi }\tan ^{ - 1} \left( {{{s^2 } \mathord{\left/ {\vphantom {{s^2 } {\sigma ^2 }}} \right. \kern-\nulldelimiterspace} {\sigma ^2 }}} \right) - 1$ , which takes the value of −1 for a perfectly regular distribution, +1 for a highly aggregated distribution and 0 for the distribution implied by the theoretical varianceσ ², is proposed and a significance table provided.

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