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Effect Size

By: Linda M. Kawentel & Richard Williams | Edited by: Paul Atkinson, Sara Delamont, Alexandru Cernat, Joseph W. Sakshaug & Richard A. Williams Published: 2020 | Length:   3 | DOI: |
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While effect size is a topic often discussed in quantitative research, scholars have differed in what they mean by this term. Some define the term broadly. For example, Geoff Cumming (2012) stated that “an effect size (ES) is simply the amount of something that might be of interest” (p. 34). A less narrow definition is that provided by Ken Kelley and Kristopher J. Preacher (2012), who defined effect size as “a quantitative reflection of the magnitude of some phenomenon that is used for the purpose of addressing a question of interest” (p. 140). In discussing conflicting definitions of effect size in the literature, Shinichi Nakagawa and Innes C. Cuthill (2007) describe how effect size has been defined in three different ways in scientific literature: (1) ...

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