The 4-parameter lognormal (SB) model of human exposure

The Annals of Occupational Hygiene
Michael R Flynn

Abstract

This paper explores the 4-parameter lognormal distribution (or Johnson S(B) distribution) as a model for occupational exposures to airborne contaminants. This model can incorporate extreme values when they are known a priori, or alternatively, they can be estimated from the data. This additional flexibility may be of value in estimating background and/or maximum exposures, as well as improving the fitting process and subsequent estimation of mean exposures. In addition, the model is physically consistent with the definition of concentration and provides a basis for linking stochastic and deterministic exposure modeling approaches. There is some additional computational burden in estimating the mean and variance of exposure relative to the usual 2-parameter lognormal model.

Citations

Jul 12, 2005·Journal of Exposure Science & Environmental Epidemiology·Michael R Flynn
Nov 22, 2014·American Journal of Agricultural Economics·Chen ZhenRyan R Ruff

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