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IES Grant

Title: Representing and Combining the Results of Randomized Experiments in Education
Center: NCER Year: 2008
Principal Investigator: Hedges, Larry Awardee: Northwestern University
Program: Statistical and Research Methodology in Education      [Program Details]
Award Period: 3 years Award Amount: $469,214
Type: Methodological Innovation Award Number: R305U080002

Purpose: The multi-site randomized experiment is an important tool in education science, but the use of evidence from such trials has sometimes posed technical problems. The results from this research project will make it easier to interpret, represent, and use the results of randomized experiments in education.

Project Activities: The outcomes provide after-the-fact adjustments (approaching corrections) to reported results where the original researcher has failed to take into account the effect of clustering on the precision of estimates used in significance testing, and calculations of power and intervention effect sizes. The adjustments vary by a variety of factors, including the actual clustering, the nature of the dependent variable, and the hierarchical nature of the research design.

Products and Publications


Journal article, monograph, or newsletter

Borenstein, M., Hedges, L.V., Higgins, J.T., and Rothstein, H.R. (2010). A Basic Introduction to Fixed-Effect and Random-Effects Models For Meta-Analysis. Research Synthesis Methods, 1(2): 97–111.

Hedges, L.V., Hedberg, E.C., and Kuyper, A.M. (2012). The Variance of Intraclass Correlations in Three- and Four-Level Models. Educational and Psychological Measurement, 72(6): 893–909.

** This project was submitted to and funded as an Unsolicited application in FY 2008.