Proceedings of the New Zealand Ecological Society (1972) 19: 158- 162

A modification to Lefkovitch's index of spatial distribution.

Research Article
K. W. Duncan  
  1. Department of Zoology, University of Canterbury, Christchurch

A new index for contagion based on Taylor's Power Law is proposed. It is defined by D = 4/π arctan [log (variance)/log (mean)]-l. A method of calculating confidence limits for this index and the coefficient of dispersion is given.