On the information-theoretical meaning of Hill's parametric evenness
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Updated: Oct 1, 2026

A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments
Published on: March 1, 2022
1Department of Plant Biology, University of Rome La Sapienza, Italy. carlo.ricotta@uniromal.it
Abstract:
The degree to which abundances are divided equitably among community species or evenness is a basic property of any biological community. Several evenness indices have been proposed to summarize community structure. However, despite their potential applicability in ecological research, none seems to be generally preferred. In this paper we show that, unlike other evenness indices without any clear information-theoretical meaning, Hill's parametric diversity measure E(alpha,0) has an immediate relation to Rényi's generalized information. Therefore, E(alpha,0) might be adequate for summarizing community structure within the context of a general theoretical framework of diversity analysis based on information theory.
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