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Peer reviewedVevea, Jack L.; Hedges, Larry V. – Psychometrika, 1995
When the process of publication favors studies with small p-values and large effect estimates, combined estimates from many studies may be biased. This paper describes a model for estimation of effect size when there is selection based on one-tailed p-values. (SLD)
Descriptors: Bias, Effect Size, Equations (Mathematics), Estimation (Mathematics)
Download full textHedges, Larry V.; And Others – 1989
Methods for meta-analysis have evolved dramatically since Gene Glass first proposed the term in 1976. Since that time statistical and nonstatistical aspects of methodology for meta-analysis have been developing at a steady pace. This guide is an attempt to provide a practical introduction to rigorous procedures in the meta-analysis of social…
Descriptors: Comparative Analysis, Effect Size, Higher Education, Meta Analysis
