Statistical Power and Effect Sizes of Clinical Neuropsychology Research.
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| Title: | Statistical Power and Effect Sizes of Clinical Neuropsychology Research. |
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| Authors: | Bezeau, Scott, Graves, Roger |
| Source: | Journal of Clinical & Experimental Neuropsychology. Jun2001, Vol. 23 Issue 3, p399-406. 08p. 4 Charts. |
| Subjects: | Statistics, Clinical neuropsychology |
| Abstract: | Cohen, in a now classic paper on statistical power, reviewed articles in the 1960 issue of one psychology journal and determined that the majority of studies had less than a 50–50 chance of detecting an effect that truly exists in the population, and thus of obtaining statistically significant results. Such low statistical power, Cohen concluded, was largely due to inadequate sample sizes. Subsequent reviews of research published in other experimental psychology journals found similar results. We provide a statistical power analysis of clinical neuropsychological research by reviewing a representative sample of 66 articles from the Journal of Clinical and Experimental Neuropsychology, the Journal of the International Neuropsychology Society, and Neuropsychology. The results show inadequate power, similar to that for experimental research, when Cohen’s criterion for effect size is used. However, the results are encouraging in also showing that the field of clinical neuropsychology deals with larger effect sizes than are usually observed in experimental psychology and that the reviewed clinical neuropsychology research does have adequate power to detect these larger effect sizes. This review also reveals a prevailing failure to heed Cohen’s recommendations that researchers should routinely report a priori power analyses, effect sizes and confidence intervals, and conduct fewer statistical tests. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Clinical & Experimental Neuropsychology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: pbh DbLabel: Psychology and Behavioral Sciences Collection An: 4885619 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Statistical Power and Effect Sizes of Clinical Neuropsychology Research. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bezeau%2C+Scott%22">Bezeau, Scott</searchLink><br /><searchLink fieldCode="AR" term="%22Graves%2C+Roger%22">Graves, Roger</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Clinical+%26+Experimental+Neuropsychology%22">Journal of Clinical & Experimental Neuropsychology</searchLink>. Jun2001, Vol. 23 Issue 3, p399-406. 08p. 4 Charts. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Statistics%22">Statistics</searchLink><br /><searchLink fieldCode="DE" term="%22Clinical+neuropsychology%22">Clinical neuropsychology</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Cohen, in a now classic paper on statistical power, reviewed articles in the 1960 issue of one psychology journal and determined that the majority of studies had less than a 50–50 chance of detecting an effect that truly exists in the population, and thus of obtaining statistically significant results. Such low statistical power, Cohen concluded, was largely due to inadequate sample sizes. Subsequent reviews of research published in other experimental psychology journals found similar results. We provide a statistical power analysis of clinical neuropsychological research by reviewing a representative sample of 66 articles from the Journal of Clinical and Experimental Neuropsychology, the Journal of the International Neuropsychology Society, and Neuropsychology. The results show inadequate power, similar to that for experimental research, when Cohen’s criterion for effect size is used. However, the results are encouraging in also showing that the field of clinical neuropsychology deals with larger effect sizes than are usually observed in experimental psychology and that the reviewed clinical neuropsychology research does have adequate power to detect these larger effect sizes. This review also reveals a prevailing failure to heed Cohen’s recommendations that researchers should routinely report a priori power analyses, effect sizes and confidence intervals, and conduct fewer statistical tests. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Clinical & Experimental Neuropsychology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=pbh&AN=4885619 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1076/jcen.23.3.399.1181 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 08 StartPage: 399 Subjects: – SubjectFull: Statistics Type: general – SubjectFull: Clinical neuropsychology Type: general Titles: – TitleFull: Statistical Power and Effect Sizes of Clinical Neuropsychology Research. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bezeau, Scott – PersonEntity: Name: NameFull: Graves, Roger IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2001 Type: published Y: 2001 Identifiers: – Type: issn-print Value: 13803395 Numbering: – Type: volume Value: 23 – Type: issue Value: 3 Titles: – TitleFull: Journal of Clinical & Experimental Neuropsychology Type: main |
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