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ERIC Number: EJ873864
Record Type: Journal
Publication Date: 2008
Pages: 21
Abstractor: As Provided
Reference Count: 23
ISSN: ISSN-1934-5747
Are Power Analyses Reported with Adequate Detail? Evidence from the First Wave of Group Randomized Trials Funded by the Institute of Education Sciences
Spybrook, Jessaca
Journal of Research on Educational Effectiveness, v1 n3 p215-235 2008
This study examines the reporting of power analyses in the group randomized trials funded by the Institute of Education Sciences from 2002 to 2006. A detailed power analysis provides critical information that allows reviewers to (a) replicate the power analysis and (b) assess whether the parameters used in the power analysis are reasonable. Without a detailed power analysis, reviewers may have difficultly evaluating the accuracy of the power analysis and underpowered studies may inadvertently pass through the review process with a recommendation for funding. This study reveals that sample sizes are reported with high consistency; however, other important design parameters, including intraclass correlations, covariate-outcome correlations, and the percentage of variance explained by blocking are not reported with regularity. An analysis of reporting trends over time reveals that the reporting of intraclass correlations and covariate-outcome correlations dramatically increased over time. The reporting of blocking information was still extremely limited, even in the more recent studies. (Contains 5 tables and 5 figures.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A