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has a slight bias, tending to overestimate the absolute value of in small samples. This bias can be removed by a simple correction that yields an unbiased estimate of, with the unbiased estimate sometimes called Hedges’
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and derived their properties. He carried out research on the relation of resources available to schools and student achievement, most notably the relation between class size and achievement.
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Borenstein, Michael, Larry V. Hedges, Julian P. T. Higgins, and Hannah R. Rothstein. 2009. Introduction to Meta-Analysis. Wiley. ISBN 9780470057247
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In 1981, Hedges published a paper describing the unbiased standardized mean difference, the
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He has authored a number of articles and books on statistical methods for
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Combining the
Results of Experiments Using Different Scales of Measurement
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Woodworth, George Walter; Hedges, Larry V.; Shymansky, James A. (1989).
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Rothstein, Hannah; Borenstein, Michael; Hedges, Larry V. (2009).
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This article about a statistician from the United States is a
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Introduction to Meta-Analysis (Statistics in
Practice)
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Fellows of the
American Academy of Arts and Sciences
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A practical guide to modern methods of meta-analysis
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