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Direct linkBetsy Wolf – Society for Research on Educational Effectiveness, 2021
The What Works Clearinghouse (WWC) seeks to provide practitioners information about "what works in education." One challenge in understanding "what works" to practitioners is that effect sizes--the degree to which an intervention produces positive (or negative) outcomes--are not comparable across different interventions, in…
Descriptors: Effect Size, Outcome Measures, Intervention, Educational Research
Scammacca, Nancy K.; Roberts, Greg; Vaughn, Sharon; Stuebing, Karla K. – Journal of Learning Disabilities, 2015
This meta-analysis synthesizes the literature on interventions for struggling readers in Grades 4 through 12 published between 1980 and 2011. It updates Scammacca et al.'s analysis of studies published between 1980 and 2004. The combined corpus of 82 study-wise effect sizes was meta-analyzed to determine (a) the overall effectiveness of reading…
Descriptors: Meta Analysis, Intervention, Reading Difficulties, Elementary Secondary Education
Download full textSchochet, Peter Z. – National Center for Education Evaluation and Regional Assistance, 2008
This report presents guidelines for addressing the multiple comparisons problem in impact evaluations in the education area. The problem occurs due to the large number of hypothesis tests that are typically conducted across outcomes and subgroups in these studies, which can lead to spurious statistically significant impact findings. The…
Descriptors: Guidelines, Testing, Hypothesis Testing, Statistical Significance
