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Longitudinal Stability Of Effect Sizes In Educational Research, Joshua A. Stephens
Longitudinal Stability Of Effect Sizes In Educational Research, Joshua A. Stephens
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Effect sizes are the statistic generated by meta-analyses, a commonly used statistic in education research. Meta-analyses are widely used by education practitioners, administrators, and policy makers as a means to decide best classroom or school practices. It has been suggested by authors in other fields, most notably Jennions and Moller (2001), that effect sizes have declined over time due to various sources of bias. This paper examines the question of whether shifting effect sizes can be observed in educational research and attempts to explain possible causes of this observation. It uses the methodological framework used by Jennions and Moller (2001) …