Larry Hedges

Larry Vernon Hedges

Board of Trustees Professor of Statistics and Social Policy
Faculty Fellow , Institute for Policy Research

Annenberg Hall
2120 Campus Drive
Evanston, IL 60208-0001


A national leader in the fields of educational statistics and evaluation, Larry V. Hedges joined the Northwestern faculty in 2005. He is one of eight Board of Trustees Professors at Northwestern, the university’s most distinguished academic position. He holds appointments in statistics, psychology and education and social policy. Previously, he was the Stella M. Rowley Professor at the University of Chicago. In 2018, Hedges received the Yidan Prize in Education Research, the world's largest education award. 

Hedges's research straddles many fields — in particular those of sociology, psychology and educational policy. He is best known for his work to develop statistical methods for meta-analysis (a statistical analysis of the results of multiple studies that combines their findings) in the social, medical and biological sciences. It is a key component of evidence-based social research. Examples of some his recent studies include understanding the costs of generating systematic reviews, differences between boys and girls in mental test scores, the black-white gap in achievement test scores, and frameworks for international comparative studies on education.

Widely published, he has authored or co-authored numerous journal articles and eight books, including the seminal Statistical Methods for Meta-Analysis (with I. Olkin) and The Handbook of Research Synthesis (with H. Cooper and J. Valentine).

He is an elected member of the National Academy of Education and is a fellow of the American Academy of Arts and Sciences, the American Statistical Association, the American Psychological Association, and the American Educational Research Association. He is a member of the National Education Sciences Board and president of the Society for Research on Educational Effectiveness. He was nominated by President Barack Obama to the Board of Directors for the National Board for Education Sciences and was confirmed by the U.S. Senate in June 2012. He was recently elected 2013-14 Statistician of the Year by the Chicago chapter of the American Statistical Association.

Curriculum Vitae

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  • 2018 - Yidan Prize for Education Research
  • 2018 - Honorary Member of the European Association of Methodology
  • 2017 - Chairman of the U.S. National Education Sciences Board
  • 2017 - Member, National Board for Education Sciences
  • 2014 - Sells Award for Distinguished Multivariate Research
  • 2013 - Statistician of the Year, Chicago Chapter, American Statistical Association
  • 2007 - Ingram Olkin Award



Year Degree Institution
1980 PhD, Mathematical Methods in Educational Research Stanford University
BA, Mathematics University of California at San Diego
MA, Statistics Stanford University

Selected Publications

Cooper, H. C., Hedges, L. V., & Valentine, J. (Working Paper/In Press/Under Review). The handbook of research synthesis and meta-analysis (2nd edition). New York: The Russell Sage Foundation.

Hedges, L. V. (Working Paper/In Press/Under Review). Correcting a significance test for clustering in designs with two levels of nesting. Journal of Educational and Behavioral Statistics.

Hedges, L. V. & Rhoads, C. (Working Paper/In Press/Under Review). Statistical power analysis in B. McGaw, E. Baker, and P. Peterson (Eds.), International Encyclopedia of Education Oxford: Elsevier.

Borenstein, M., Hedges, L. V., & Rothstein, H. (Working Paper/In Press/Under Review). Introductory meta-analysis. London: John Wiley.

Hedges, L. V. & Hanis, J. (2009). Can non-randomized studies provide evidence of causal effects? A case study using the regression discontinuity design in P. B. Walters, A. Lareau, & S. H. Ranis (Eds.) , Education research on trial (pp. 106-124). New York: Routledge.

Shadish, W. R., Rindskopf, D. M., & Hedges, L. V. (2008). The state of the science in the meta-analysis of single-case experimental designs. Evidence-Based Communication Assessment and Intervention: 188-196.

Hedges. L. V. (2008). What are effect sizes and why do we need them? . Developmental Psychology Perspectives: 167-171.

Konstantopoulos, S., & Hedges, L. V. (2008). How large an effect can we expect from school reforms?. Teachers College Record, 110: 1613-1640.

Hedges, L. V. (2007). Meta-analysis in C. R. Rao & S. Sinharay (Eds.) , The handbook of statistics (pp. 919-953). Elsevier Scientific.

Hedges, L. V. (2007). Generalizability of treatment effects in B. Schneider and S. K. McDonald (Eds.) , Scale-Up in Principle (pp. 55-78). Rowman & Littlefield.

Hedges, L. V. (2007). Correcting a significance test for clustering. Journal of Educational and Behavioral Statistics.

Hedges, L. V. (2007). Effect sizes in cluster randomized designs. Journal of Educational and Behavioral Statistics.

Hedges, L. V. & Hedberg, E. C. (2007). Intraclass correlations for planning group randomized experiments in rural education. Journal for Research in Rural Education.

Huttenlocher, J, Hedges, L. V., Crawford, E., & Corrigan, B. (2007). Estimating stimuli in contrasting categories: Truncations due to boundaries. Journal of Experimental Psychology.

Huttenlocher, Vasilyeva, M., Vevea, J., & Hedges, L. V. (2007). Varieties of speech in young children. Developmental Psychology.

Crawford, E., Huttenlocher, J, & Hedges, L. V. (2006). Within-category feature correlations and Bayesian adjustment strategies. Psychonomic Bulletin and Review, 13: 245-250.

Klibanoff, R., Levine, S.C., Huttenlocher, J., Vasilyeva, M, & Hedges, L.V. (2006). Preschool children's mathematical knowledge: The effect of teacher input. Developmental Psychology, 42: 59-69.

Hedges, L. V. (2005). Selection model approaches to publication bias in Rothstein, H., Sutton, A., & Borenstein, M., Publication bias in meta-analysis John Wiley.

Selected Presentations

Hedges, L.V. (November, 2008). Recent developments in meta-analysis. Invited address at the annual meeting of Conference on Innovations in Trauma Research Methods. Evanston, IL.

Hedges, L.V. (July, 2008). Improving the generalization from meta-analysisImproving the generalization from meta-analysis. Invited address at the annual meeting of the Society for Research Synthesis Methods. Corfu, Greece.

Hedges, L.V. (June, 2008). Using the instrumental variables technique in educational research. Invited address at the annual IES Research Conference. Washington, DC.

Hedges, L.V. (August, 2006). Meta-analysis at age 30 (or 102 or 201). Keynote address given at the Society for Research Synthesis Methods. Cambridge, Cambodia.

Hedges, L.V. (June, 2006). Recommendations for development studies. Paper presented at the first annual IES Research Conference. Washington, D.C..

Hedges, L.V. (April, 2006). John A. Hannah lecture . On April 18, 2006, I gave the first John A. Hannah lecture at Michigan State University. East Lansing, MI.

Hedges, L.V. (August, 2005). Meta-analysis applied to health psychology. American Psychological Association Annual Meeting. Washington, DC.

Hedges, L.V. (February, 2005). Effect sizes in cluster randomized designs. Campbell Collaboration Annual Meeting. Lisbon, Portugal.

Hedges, L.V. (February, 2005). Advanced statistical methods for meta-analysis. Campbell COllaboration Annual Meeting. Lisbon, Portugal.

Hedges, L.V. Keynote Address. Keynote address to the Interagency Educational Research Initiative Principal Investigators meeting. Pentagon City, VA.

Research Interests

Development and application of statistical methods for the social, medical, and biological sciences; evaluation research.


Professional Organizations

2008 - Present American Educational Research Association
2008 - Present Society for Research Synthesis Methods
Society for Research on Educational Effectiveness
I am a co-founder of the Society for Research on Educational Effectiveness, a new interdisciplinary professional society supporting rigorous research on education, which had its third annual meeting in 2009.

Professional Service

Year Organization Position Description
2008 American Academy of Arts and Sciences Fellow
2006 US Institute of Education Science’s What Works Clearinghouse’s Technical Advisory Committee Chair
2006 US Institute of Education Sciences (IES) standing grant review panel on math and science education research Member
2006 Technical Executive Group to the International Association for the Evaluation of Educational Achievement (IEA) Member This group is an international nongovernmental organization that coordinates international comparative studies of educational achievement. The technical executive group advises the IEA General Assembly on standards for its research and on the technical adequacy of proposed and ongoing IEA studies.
2006 Technical Advisory Committee of the Organization on Economic Cooperation and Development (OECD) Programme for International Student Assessment (PISA) Member This program conducts comparative student assessment studies of reading, mathematics, and science literacy based on national probability samples of students in 28 OECD countries and about 20 other countries
2006 Russell Sage Foundation Trustee
2006 Russell Sage Foundation Member of the Board of Trustees This group is the largest US foundation that exclusively supports basic research in the social sciences.
2006 OECD, PISA Member, Technical Advisory Group The Technical Advisory Group provides advice about the technical adequacy of the PISA program, the OECD's program of international comparative studies of literacy
2006 National Research Council Co-chair, Committee on Encouraging Underrepresented Minorities to Pursue Biomedical Research Careers The committee is concerned with designing research to understand approaches to increasing the number of minority group members to pursue biomedical research careers
2006 National Academy of Education Director (member of the board of directors)
2006 IEA Member, Technical Executive Group The Technical Executive Group advises the IEA General Assembly on the technical adequacy of proposed and ongoing international comparative studies of academic achievement
2006 Board of Directors of the National Academy of Education Member
2006 American Educational Research Association’s Task Force Member To develop standards for the reporting educational research
2006 AERA Member Task Force on Standards for Reporting Research Methods
2005 National Institutes of Health Faculty Member Summer Institute on Randomized Clinical Trials Involving Behavioral Interventions

Editorial Boards

Year Journal Name Position
2005 American Journal of Sociology Associate Editor


Works In Progress

2008 Research
the representation of results via effect size measures of cluster randomized experiments in education and social research and combination of these representations across experiments (supported by a grant form the US IES). the planning of cluster randomized experiments in education and the development of reference values on population variance components to aid in that planning (supported by a grant from the US NSF). the social distribution of talent, ability, and academic achievement (supported by a grant from the Spencer Foundation) the role of input effects in the development of language in young children via a longitudinal study of language development from age 12 months to 60 months (supported by a grant from the US NICHD) the use of statistical ideas to incorporate uncertainty into models of cognition and spatial competence (supported by a grant from the US NSF). the development of a society for the advancement of scientific research in education (supported by a grant form the US IES). advanced training for established researchers in randomized field experiments in education (supported by the US IES). training of post doctoral researchers in education research (supported by the US IES).

Last Updated: 2019-01-27 21:34:18