Accession Number : ADA113866

Title :   Moments of Particle Size Distributions under Sequential Breakage with Applications to Species Abundance.

Descriptive Note : Technical rept.,


Personal Author(s) : Siegel,Andrew F ; Sugihara,George

PDF Url : ADA113866

Report Date : Nov 1981

Pagination or Media Count : 15

Abstract : The sequential broken stick model has appeared in numerous contexts, including biology, physics, engineering and geology. Kolmogorov showed that under appropriate conditions, sequential breakage processes often yield a lognormal distribution of particle sizes. Of particular interest to ecologists is the observed variance of the logarithms of the sizes, which characterizes the evenness of an assemblage of species. We derive the first two moments for the logarithms of the sizes in terms of the underlying distribution used to determine the successive breakages. In particular, for a process yielding n pieces, the expected sample variance behaves asymptotically as n log(n). These results also yield a new identity for moments of path lengths in random binary trees. (Author)

Descriptors :   Biostatistics, Ecology, Distribution theory, Sequences(Mathematics), Analysis of variance, Asymptotic series, Paths, Length, Binary arithmetic, Random variables, Ecosystems, Mathematical models

Subject Categories : Biology
      Statistics and Probability

Distribution Statement : APPROVED FOR PUBLIC RELEASE