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IES Grant

Title: Representation and Combination of the Results of Multi-site Randomized Experiments in Education
Center: NCER Year: 2004
Principal Investigator: Hedges, Larry Awardee: Northwestern University
Program: Statistical and Research Methodology in Education      [Program Details]
Award Period: 3 years Award Amount: $449,504
Type: Methodological Innovation Award Number: R305U040007

Purpose: This research addressed two problems: (1) How to adjust (approximately) analyses that improperly ignored clustering inherent in the design without going through an entire re-analysis, and (2) How to represent and combine the results of several experiments, some of which yield several measures of the same outcome construct when the correlation structure of the outcomes is unknown.

Email Larry Hedges for additional information:

Products and Publications

Book chapter

Hedges, L.V. (2007). Meta-Analysis. In C.R. Rao (Ed.), The Handbook of Statistics (pp. 919–953). Amsterdam: Elsevier.

Journal article, monograph, or newsletter

Hedges, L.V. (2011). Effect Sizes in Three-Level Cluster-Randomized Experiments. Journal of Educational and Behavioral Statistics, 36(3): 346–380.

Hedges, L.V. (2007). Correcting a Significance Test for Clustering. Journal of Educational and Behavioral Statistics, 32(2): 151–179.

Hedges, L.V. (2007). Effect Sizes in Cluster-Randomized Designs. Journal of Educational and Behavioral Statistics, 32(4): 341–370.

** This project was submitted to and funded as an Unsolicited application in FY 2004.