How Methodological Features Affect Effect Sizes in Education

@article{Cheung2016HowMF,
  title={How Methodological Features Affect Effect Sizes in Education},
  author={Alan Chi Keung Cheung and Robert E. Slavin},
  journal={Educational Researcher},
  year={2016},
  volume={45},
  pages={283 - 292}
}
As evidence becomes increasingly important in educational policy, it is essential to understand how research design might contribute to reported effect sizes in experiments evaluating educational programs. A total of 645 studies from 12 recent reviews of evaluations of preschool, reading, mathematics, and science programs were studied. Effect sizes were roughly twice as large for published articles, small-scale trials, and experimenter-made measures, compared to unpublished documents, large… 

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