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To Adjust or Not Adjust: Nonparametric Effect Sizes, Confidence Intervals, and Real-World Meaning
Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI), Gruppen för forskning om Idrott, Hälsa och Fysisk aktivitet.
School of Sport and Exercise Science and the Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Australia.
Högskolan i Halmstad, Akademin för hälsa och välfärd, Centrum för forskning om välfärd, hälsa och idrott (CVHI), Gruppen för forskning om Idrott, Hälsa och Fysisk aktivitet.ORCID-id: 0000-0003-0990-4842
Department of Food and Nutrition, and Sport(s) Science, University of Gothenburg, Sweden;Department of Psychology, University of Gothenburg, Sweden.
2013 (engelsk)Inngår i: Psychology of Sport And Exercise, ISSN 1469-0292, E-ISSN 1878-5476, Vol. 14, nr 1, s. 97-102Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Objectives: The main objectives of this article are to: (a) investigate if there are any meaningful differences between adjusted and unadjusted effect sizes (b) compare the outcomes from parametric and non-parametric effect sizes to determine if the potential differences might influence the interpretation of results, (c) discuss the importance of reporting confidence intervals in research, and discuss how to interpret effect sizes in terms of practical real-world meaning.

Design: Review.

Method: A review of how to estimate and interpret various effect sizes was conducted. Hypothetical examples were then used to exemplify the issues stated in the objectives.

Results: The results from the hypothetical research designs showed that: (a) there is a substantial difference between adjusted and non-adjusted effect sizes especially in studies with small sample sizes, and (b) there are differences in outcomes between the parametric and non-parametric effect size formulas that may affect interpretations of results.

Conclusions: The different hypothetical examples in this article clearly demonstrate the importance of treating data in ways that minimize potential biases and the central issues of how to discuss the meaningfulness of effect sizes in research. © 2012 Elsevier Ltd.

sted, utgiver, år, opplag, sider
Amsterdam: Elsevier, 2013. Vol. 14, nr 1, s. 97-102
Emneord [en]
Adjusted effect size, Practical significance, Statistical interpretation
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Identifikatorer
URN: urn:nbn:se:hh:diva-20109DOI: 10.1016/j.psychsport.2012.07.007ISI: 000312426000011Scopus ID: 2-s2.0-84866775756OAI: oai:DiVA.org:hh-20109DiVA, id: diva2:576924
Tilgjengelig fra: 2012-12-14 Laget: 2012-12-14 Sist oppdatert: 2018-07-05bibliografisk kontrollert

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Ivarsson, AndreasAndersen, Mark B.Johnson, UrbanLindwall, Magnus

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