Standardized or simple effect size: What should be reported?
It is regarded as best practice for psychologists to report effect size when disseminating quantitative research findings. Reporting of effect size in the psychological literature is patchy—though this may be changing—and when reported it is far from clear that appropriate effect size statistics are...
| Published in: | British Journal of Psychology Vol. 100; no. 3; pp. 603 - 618 |
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| Format: | Article |
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Wiley-Blackwell
August 2009
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=510879553&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 510879553 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 00071269 BJP jtl: British Journal of Psychology issn: 00071269 maglogo: N pubinfo: dt: August 2009 vid: 100 iid: 3 pid: 480 pub: Wiley-Blackwell artinfo: ui: 510879553 10.1348/000712608X377117 ppf: 603 ppct: 15 formats: fmt: – @attributes: type: T – @attributes: type: P size: 1.2MB tig: atl: Standardized or simple effect size: What should be reported? aug: au: Baguley, Thom su: Psychological research Effect sizes (Statistics) Psychological techniques Psychology -- Statistical methods sug: subj: Psychological research Effect sizes (Statistics) Psychological techniques Psychology -- Statistical methods ab: It is regarded as best practice for psychologists to report effect size when disseminating quantitative research findings. Reporting of effect size in the psychological literature is patchy—though this may be changing—and when reported it is far from clear that appropriate effect size statistics are employed. This paper considers the practice of reporting point estimates of standardized effect size and explores factors such as reliability, range restriction and differences in design that distort standardized effect size unless suitable corrections are employed. For most purposes simple (unstandardized) effect size is more robust and versatile than standardized effect size. Guidelines for deciding what effect size metric to use and how to report it are outlined. Foremost among these are: (i) a preference for simple effect size over standardized effect size, and (ii) the use of confidence intervals to indicate a plausible range of values the effect might take. Deciding on the appropriate effect size statistic to report always requires careful thought and should be influenced by the goals of the researcher, the context of the research and the potential needs of readers. Reprinted by permission of the publisher. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
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