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This paper is concerned with the distributional aspects of environmental indices. The decreasing logistic function that is proposed can be used to fit the subjectively defined index. It is shown that the density distribution of an environmental index belongs to Johnson's SB system of distribution and can be unimodal or bimodal. The statistical consequences of the shape of the index distribution are also discussed.

Additional information

Authors: COLOMBO A G, JRC Ispra (IT);IHM P, University of Marburg, Institute of Medical Biometry (DE)
Bibliographic Reference: Paper presented: 49th Session, International Statistical Institute, Firenze (IT), August 25 - September 2, 1993
Availability: Available from (1) as Paper EN 37634 ORA
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