Description
- Abstract:
- Effect sizes in the Cohen’s d family are often used in education to compare estimates across studies, measures, and sample sizes. For example, effect sizes are used to compare gains in achievement students make over time, either in pre- and post-treatment studies or in the absence of intervention, such as when estimating achievement gaps. However, despite extensive research dating back to the paired t-test literature showing that such growth effect sizes should account for within-person correlations of scores over time, such achievement gains are often standardized relative to the standard deviation from a single timepoint or two timepoints pooled. Such a tendency likely occurs in part because there are not many large datasets from which a distribution of student- or school-level gains can be derived. In this study, we present a novel model for estimating student growth in conjunction with a national dataset to show that effect size estimates for student and school growth are often quite different when standardized relative to a distribution of gains rather than static achievement. In particular, we provide nationally representative empirical benchmarks for student achievement and gains, including for male-female gaps in those gains, and examine the sensitivity of those effect sizes to how they are standardized. Our results suggest that effect sizes scaled relative to a distribution of gains are less likely to understate the effects of interventions over time, and that resultant effect sizes often more closely match the estimand of interest for most practice, policy, and evaluation questions.
Access Conditions
- Use and Reproduction
- In Copyright
Citation
James Soland, and Yeow Meng Thum,
"Effect Sizes for Measuring Student and School Growth in Achievement: In Search of Practical Significance"
(2019).
EdWorkingPapers.com Archive.
Brown Digital Repository. Brown University Library.
https://repository.library.brown.edu/studio/item/bdr:956645/
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EdWorkingPapers.com Archive
The Annenberg Institute at Brown University has developed this national working paper series to provide public access to high-quality papers from multiple disciplines on a wide variety of topics related to education. EdWorkingPapers focuses particularly on research with strong implications …...