Larry Vernon Hedges is a researcher in

statistical methods Statistics (from German language, German: ', "description of a State (polity), state, a country") is the discipline that concerns the collection, organization, analysis, interpretation, and presentation of data. In applying statistics to a s ...

for

meta-analysis Meta-analysis is a method of synthesis of quantitative data from multiple independent studies addressing a common research question. An important part of this method involves computing a combined effect size across all of the studies. As such, th ...

and

evaluation In common usage, evaluation is a systematic determination and assessment of a subject's merit, worth and significance, using criteria governed by a set of Standardization, standards. It can assist an organization, program, design, project or any o ...

education policy Education policy consists of the principles and policy decisions that influence the field of education, as well as the collection of laws and rules that govern the operation of education systems. Education governance may be shared between the local ...

. He is Professor of Statistics and Education and Social Policy, Institute for Policy Research,

Northwestern University Northwestern University (NU) is a Private university, private research university in Evanston, Illinois, United States. Established in 1851 to serve the historic Northwest Territory, it is the oldest University charter, chartered university in ...

. Previously, he was the Stella M. Rowley Distinguished Service Professor of Education, Sociology, Psychology, and Public Policy Studies at the

University of Chicago The University of Chicago (UChicago, Chicago, or UChi) is a Private university, private research university in Chicago, Illinois, United States. Its main campus is in the Hyde Park, Chicago, Hyde Park neighborhood on Chicago's South Side, Chic ...

. He is a member of the

National Academy of Education The National Academy of Education (NAEd) is a nonprofit, non-governmental organization in the United States that advances high-quality research to improve education policy and practice. Founded in 1965, the NAEd currently consists of over 300 elect ...

and a fellow of the

American Academy of Arts and Sciences The American Academy of Arts and Sciences (The Academy) is one of the oldest learned societies in the United States. It was founded in 1780 during the American Revolution by John Adams, John Hancock, James Bowdoin, Andrew Oliver, and other ...

, the

American Educational Research Association The American Educational Research Association (AERA, pronounced "A-E-R-A") is a professional organization representing education researchers in the United States and around the world. AERA's mission is to advance knowledge about education and ...

, the

American Psychological Association The American Psychological Association (APA) is the main professional organization of psychologists in the United States, and the largest psychological association in the world. It has over 170,000 members, including scientists, educators, clin ...

, and the

American Statistical Association The American Statistical Association (ASA) is the main professional organization for statisticians and related professionals in the United States. It was founded in Boston, Massachusetts, on November 27, 1839, and is the second-oldest continuous ...

. In 2018, he received the

Yidan Prize for Education Research The Yidan Prize (/i:dan/) is an annual award founded in 2016 by Chen Yidan for "contributions to education research and development". The prize is financed and governed by a (about US$320 million) independent trust. It is a global, inclusive educ ...

, the world's most prestigious and largest education prize, i.e. USD four million. He has authored a number of articles and books on statistical methods for

, which is the use of statistical methods for combining results from different studies. He also suggested several estimators for

effect size In statistics, an effect size is a value measuring the strength of the relationship between two variables in a population, or a sample-based estimate of that quantity. It can refer to the value of a statistic calculated from a sample of data, the ...

s 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.

Hedges' g

In 1981, Hedges published a paper describing the unbiased standardized mean difference, the g statistic. "It turns out that ohen'sd 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’ g."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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* * Living people American statisticians 21st-century American social scientists Northwestern University faculty University of Chicago faculty Stanford University alumni Fellows of the American Statistical Association Fellows of the American Academy of Arts and Sciences Fellows of the American Psychological Association Educational researchers Year of birth missing (living people) Yidan Prize laureates {{US-statistician-stub