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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 |
Biography
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 will hold appointments in statistics and education and social policy. Previously, he was the Stella M. Rowley Professor at the University of Chicago.Curriculum Vitae
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 five books, including the seminal Statistical Methods for Meta-Analysis: A Practical Guide to Modern Methods of Meta-Analysis (with I. Olkin) and The Handbook of Research Synthesis (with H. Cooper).
He has been elected a member or fellow of numerous boards, associations and professional organizations, including the National Academy of Education, the American Statistical Association, the American Psychological Association, and the Society of Multivariate Experimental Psychology. He is convener of the Campbell Collaboration's statistics group, which is part of a larger effort to produce an online database of "best practices" in the social sciences and education. He chairs the Technical Advisory Group of the U.S. Department of Education’s What Works Clearinghouse, an initiative to give educators and researchers a library of systematic reviews to aid in the development of evidenced-based educational policy.
WebsitesView Larry Hedges's CV.
Institute for Policy ResearchAwards/Honors
2007 - Ingram Olkin Award
Research/Scholarship
Education
Selected Publications
Year Degree Institution 1980 Ph.D., Mathematical Methods in Educational Research Stanford University B.A., Mathematics University of California at San Diego M.A., Statistics Stanford University
Cooper, H. C., Hedges, L. V., & Valentine, J. (In Press/Under Review). The handbook of research synthesis and meta-analysis (2nd edition). New York: The Russell Sage Foundation.Selected Presentations
Hedges, L. V. (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. (In Press/Under Review). Statistical power analysis in B. McGaw, E. Baker, and P. Peterson (Eds.), International Encyclopedia of Education.
Borenstein, M., Hedges, L. V., & Rothstein, H. (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: 106-124.
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: 919-953.
Hedges, L. V. (2007). Generalizability of treatment effects in B. Schneider and S. K. McDonald (Eds.) , Scale-Up in Principle: 55-78.
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.
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.Projects
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.
Evaluation of After School MattersResearch Interests
Development and application of statistical methods for the social, medical, and biological sciences; evaluation research.
Service/Recognition
Professional Organizations
Professional Service
2008 - Present American Educational Research Association
Fellow2008 - Present Society for Research Synthesis Methods
PresidentSociety for Research on Educational Effectiveness
Co-founder
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.
Editorial Boards
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, Committe on Encouraging Underrepresented Minorities to Pursue Biomedical Research Careers The committee is concerned with designing research to understand what approaches to increasing the number of minority group memebrs 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
Year Journal Name Position 2005 American Journal of Sociology Associate Editor
Professional
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).