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Article: Role of effect sizes in contemporary research in counseling.(Research and Theory)
- Article from:
- Counseling and Values
- Article date:
- April 1, 2006
- Author:
CopyrightCOPYRIGHT 2006 American Counseling Association. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Effect sizes (e.g., Cohen's d, Glass's [delta], [[eta].sup.2], adjusted [R.sup.2], [[omega].sup.2]) quantify the extent to which sample results diverge from the expectations specified in the null hypothesis. The present article addresses 5 related questions, First, is the advocacy for reporting and interpreting effect sizes part of the controversy over statistical significance testing? Second, why cannot p values be used as effect sizes? Third, what are the various categories of effect sizes and some commonly used examples of each type? Fourth, how should effect sizes be interpreted? Fifth, what are some recommendations for further reading?
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