ERIC Number: ED464140
Record Type: RIE
Publication Date: 2002-Apr
Effect Size Statistics: An Analysis of Statistics Textbooks Used in Psychology and Education.
Curtis, Deborah A.; Araki, Cheri J.
The purpose of this research was to analyze recent statistics textbooks (n=22) to examine the ways in which authors addressed the issue of effect size (ES) and the practical significance of research results. In terms of the overall prevalence of ES statistics, the one-sample, matched-pair, and two-sample t-tests, and one-factor analysis of variance were presented in all 22 texts. ES statistics corresponding to each of these significance tests were presented in 4, 9, 16, and 18 texts, respectively. Problems with the way in which ES statistics were presented were identified, including the failure to distinguish between ES parameters and statistics, the use of conceptually uninformative cookbook formulas, and the lack of agreement on how to calculate specific ES statistics. Problems with the ways in which authors discussed the interpretation of the magnitude of the ES statistics were also identified, including the over-reliance on rules of thumb. (Contains 3 tables and 66 references.) (Author/SLD)
Publication Type: Information Analyses; Speeches/Meeting Papers
Education Level: N/A
Authoring Institution: N/A
Note: Paper presented at the Annual Meeting of the American Educational Research Association (New Orleans, LA, April 1-5, 2002).