Larry V. Hedges

The Handbook of Research Synthesis and Meta-Analysis

The chapter on stochastically dependent effect sizes by Gleser and Olkin (2009) in The handbook of research synthesis and meta-analysis (2nd ed.) describes. Download Here: tinyu...

Introduction to Meta‐Analysis

A Brief History of Research Synthesis

Science is supposed to be cumulative, but scientists only rarely cumulate evidence scientifically. This means that users of research evidence have to cope with a plethora of rep...

STATISTICAL ISSUES IN ECOLOGICAL META-ANALYSES

Meta-analysis is the use of statistical methods to summarize research findings across studies. Special statistical methods are usually needed for meta-analysis, both because eff...

Intraclass Correlation Values for Planning Group-Randomized Trials in Education

Experiments that assign intact groups to treatment conditions are increasingly common in social research. In educational research, the groups assigned are often schools. The des...

Correcting a Significance Test for Clustering

A common mistake in analysis of cluster randomized trials is to ignore the effect of clustering and analyze the data as if each treatment group were a simple random sample. This...

Distribution Theory for Glass's Estimator of Effect size and Related Estimators

Glass's estimator of effect size, the sample mean difference divided by the sample standard deviation, is studied in the context of an explicit statistical model. The exact dist...