Exposure variability in the workplace : its implications for the assessment of compliance

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      <subfield code="a">This paper discusses the bias introduced by the time of sampling (when) and the number of samples (how often) in the estimate of variance of the exposure distribution. It includes: distribution of exposure-time series; drawing random samples from a lognormal distribution; analysis of workplace data sets</subfield>
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      <subfield code="g">Vol. 52, nº 1, January 1991 ; p. 6-13</subfield>
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