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ERIC Number: ED471293
Record Type: Non-Journal
Publication Date: 2002-Nov
Pages: 14
Abstractor: N/A
Reference Count: N/A
Interpreting and Reporting Effect Sizes in Research Investigations.
Tapia, Martha; Marsh, George E., II
Since 1994, the American Psychological Association (APA) has advocated the inclusion of effect size indices in reporting research to elucidate the statistical significance of studies based on sample size. In 2001, the fifth edition of the APA "Publication Manual" stressed the importance of including an index of effect size to clarify research reports. Many journal now require authors to include effect-size statistics, but there is little guidance for researchers to indicate the effect size index they should use for univariate and multivariate research designs. This paper reviews the methods suggested for reporting effect size, noting similarities and differences among them. A table summarizes the formulas for 16 common effect size statistics. (Contains 20 references.) (Author/SLD)
Publication Type: Information Analyses; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A