A Visitor's Guide to Effect Sizes--Statistical Significance versus Practical (Clinical) Importance of Research Findings

Autor/inn/en	Hojat, Mohammadreza; Xu, Gang
Titel	A Visitor's Guide to Effect Sizes--Statistical Significance versus Practical (Clinical) Importance of Research Findings
Quelle	In: Advances in Health Sciences Education, 9 (2004) 3, S.241-249 (9 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1382-4996
DOI	10.1023/B:AHSE.0000038173.00909.f6
Schlagwörter	Definitions; Statistical Significance; Effect Size; Correlation; Educational Research; Data Analysis; Research Utilization; Medical Education; Research Methodology + Suchen Sie Ihr Suchwort? Begriffsbestimmung; Korrelation; Bildungsforschung; Pädagogische Forschung; Auswertung; Forschungsumsetzung; Medizinische Ausbildung; Research method; Forschungsmethode
Abstract	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. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10