Measures of Effect Size for Comparative Studies: Applications, Interpretations, and Limitations

Although dissatisfaction with the limitations associated with tests for statistical significance has been growing for several decades, applied researchers have continued to rely almost exclusively on these indicators of effect when reporting their findings. To encourage an increased use of alternati...

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Bibliographic Details
Published inContemporary educational psychology Vol. 25; no. 3; pp. 241 - 286
Main Authors Olejnik, Stephen, Algina, James
Format Journal Article
LanguageEnglish
Published San Diego, CA Elsevier Inc 01.07.2000
Elsevier
Subjects
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Psychometrics. Statistics. Methodology
Statistics. Mathematics
Statistical method
Review
Measurement method
Size effect
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Summary:Although dissatisfaction with the limitations associated with tests for statistical significance has been growing for several decades, applied researchers have continued to rely almost exclusively on these indicators of effect when reporting their findings. To encourage an increased use of alternative measures of effect, the present paper discusses several measures of effect size that might be used in group comparison studies involving univariate and/or multivariate models. For the methods discussed, formulas are presented and data from an experimental study are used to demonstrate the application and interpretation of these indices. The paper concludes with some cautionary notes on the limitations associated with these measures of effect size.
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ISSN:0361-476X
1090-2384
DOI:10.1006/ceps.2000.1040