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ERIC Number: EJ924328
Record Type: Journal
Publication Date: 2004-Sep
Pages: 9
Abstractor: As Provided
ISSN: ISSN-1382-4996
A Visitor's Guide to Effect Sizes--Statistical Significance versus Practical (Clinical) Importance of Research Findings
Hojat, Mohammadreza; Xu, Gang
Advances in Health Sciences Education, v9 n3 p241-249 Sep 2004
Effect Sizes (ES) are an increasingly important index used to quantify the degree of practical significance of study results. This paper gives an introduction to the computation and interpretation of effect sizes from the perspective of the consumer of the research literature. The key points made are: (1) "ES" is a useful indicator of the practical (clinical) importance of research results that can be operationally defined from being "negligible" to "moderate", to "important"; (2) The "ES" has two advantages over statistical significance testing: (a) it is independent of the size of the sample; (b) it is a scale-free index. Therefore, "ES" can be uniformly interpreted in different studies regardless of the sample size and the original scales of the variables; (3) Calculations of the "ES" are illustrated by using examples of comparisons between two means, correlation coefficients, chi-square tests and two proportions, along with appropriate formulas; and (4) Operational definitions for the "ES"s are given, along with numerical examples for the purpose of illustration.
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Publication Type: Journal Articles; Reports - Evaluative
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A