✦ LIBER ✦

Role of Effect Sizes in Contemporary Research in Counseling

✍ Scribed by Bruce Thompson

Publisher: American Counseling Association
Year: 2006
Tongue: English
Weight: 84 KB
Volume: 50
Category: Article
ISSN: 0160-7960
DOI: 10.1002/j.2161-007x.2006.tb00054.x

No coin nor oath required. For personal study only.

✦ Synopsis

Effect sizes (e.g., Cohen's d, Glass's Δ, η 2 , adjusted R 2 , ω 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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