Sample size formulae for estimating the true arithmetic or geometric mean of lognormal exposure distributions

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<title>Sample size formulae for estimating the true arithmetic or geometric mean of lognormal exposure distributions</title>
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<title>American Industrial Hygiene Association journal</title>
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<namePart>Hewett, Paul</namePart>
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<dateIssued encoding="marc">1995</dateIssued>
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<abstract displayLabel="Summary">The purpose of this article is to present simple formulae for calculating the appoximate sample size required to estimate either the true arithmetic or true geometric mean of a lognormal distribution to within a specified accuracy with a specified level of confidence. These formulae should be of interest to the industrial hygienist involved in prospective or cross-sectional studies, or establishing exposure databases to be used to assess long-term changes in worker health status</abstract>
<note type="statement of responsibility">Paul Hewett</note>
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<topic>Toxicología</topic>
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<topic>Epidemiología</topic>
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<topic>Modelos matemáticos</topic>
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<topic>Estimación</topic>
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<title>American Industrial Hygiene Association journal</title>
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<text>Vol. 56, nº 3, March 1995 ; p. 219-225</text>
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