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MAP20071020092Attfield, M.D.Exact expressions for the bias and variance of estimators of the mean of a lognormal distribution / M.D. Attfield and P. HewettSumario: Exact mathematical expressions are given for the bias and variance of the arithmetic and maximum likelihood estimators of the first moment (mean) of a lognormal distribution. On the basis of these exact expressions, and without the need for simulation, statistics on the bias and variance have been computed for a range of sample sizes and geometric standards desviations. The results reaffirm that an unbiased maximum likelihood estimator exists that has minimum varianceEn: American Industrial Hygiene Association journal. - Akron, Ohio. - Vol. 53, nº 7, July 1992 ; p. 432-4351. Higiene industrial. 2. Contaminación atmosférica. 3. Contaminantes químicos. 4. Modelos matemáticos. 5. Modelos probabílisticos. 6. Muestreos. 7. Distribuciones de probabilidad. 8. Cálculos. 9. Control de la contaminación. I. Hewett, Paul. II. Title. III. Título: American Industrial Hygiene Association journal.