Bias in meta-analyses using Hedges- d

ECU Author/Contributor (non-ECU co-authors, if there are any, appear on document)

ELIZABETH A.,PAPPALARDO,PAULA,BENCE,JAMES R.,PEACOR,SCOTT D. HAMMAN (Creator)

Institution

East Carolina University (ECU )

Web Site: http://www.ecu.edu/lib/

Abstract: The type of metric and weighting method used in meta-analysis can create bias and alter coverage of confidence intervals when the estimated effect size and its weight are correlated. Here, we investigatebias associated with the common metric, Hedges" d, under conditions common in ecological meta-analyses.We simulated data from experiments, computed effect sizes and their variances, and performed meta-analyses applying three weighting schemes (inverse variance, sample size, and unweighted) for varying levelsof effect size, within-study replication, number of studies in the meta-analysis, and among-study variance.Unweighted analyses, and those using weights based on sample size, were close to unbiased and yieldedcoverages close to the nominal level of 0.95. In contrast, the inverse-variance weighting scheme led to biasand low coverage, especially for meta-analyses based on studies with low replication. This bias arosebecause of a correlation between the estimated effect and its weight when using the inverse-variance method.In many cases, the sample size weighting scheme was most efficient, and, when not, the differences in efficiency among the three methods were relatively minor. Thus, if using Hedges" d, we recomm

Additional Information

Publication

Other

Language: English

Date: 2018

Keywords

bias; coverage; effect size; Hedges-™ d; meta-analysis; sample size; weights

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