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Journal The American Statistician Volume 57, 2003 - Issue 4
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Primary Article

Confidence Intervals for Mean Absolute Deviations

Douglas G Bonett Douglas G. Bonett is Professor, Departments of Statistics and Psychology at Iowa State University, Ames, IA 50011 . Edith Seier is Associate Professor, Department of Mathematics at East Tennessee State University, Johnson City, TN 37614 . The authors thank the referees and both past and current editors for many helpful comments and suggestions. & Edith Seier Douglas G. Bonett is Professor, Departments of Statistics and Psychology at Iowa State University, Ames, IA 50011 . Edith Seier is Associate Professor, Department of Mathematics at East Tennessee State University, Johnson City, TN 37614 . The authors thank the referees and both past and current editors for many helpful comments and suggestions.
Pages 233-236
Published online: 01 Jan 2012
 
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Primary Article

Confidence Intervals for Mean Absolute Deviations

Abstract

The mean absolute deviation is a simple and informative measure of variability. Approximate confidence intervals for mean absolute deviations in one-group and two-group designs are derived and are shown to have excellent small-sample properties under moderate nonnormality. Sample size planning formulas are derived.

KEY WORDS : Dispersion, Interval estimation, Sample size, Variability
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