An evaluation of statistical procedures for comparing an individual's performance with that of a group of controls.
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| Title: | An evaluation of statistical procedures for comparing an individual's performance with that of a group of controls. |
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| Authors: | Mycroft, Rachel H., Mitchell, Don C., Kay, Janice |
| Source: | Cognitive Neuropsychology. Jun2002, Vol. 19 Issue 4, p291-299. 9p. |
| Subjects: | Cognitive neuroscience, Neuropsychology |
| Abstract: | The single case methodology that is widely used in cognitive neuropsychology often requires a comparison of data from a single individual (the patient) with that from a group of controls, in order to ascertain whether the patient's mean score can be viewed as significantly different from that of controls. This article reviews methods that have been used to deal with such data. Although Analysis of Variance (ANOVA) provides one possible solution of comparing group means, unequal group sizes and differences in variability between patient and controls can violate the assumptions of the test. Using Monte Carlo simulations, it was found that differences in group size and a group of N = 1 did not significantly affect the reliability of the analysis. In contrast, unacceptably high Type I errors were obtained when, in addition to unequal group sizes, there were relatively modest differences between the variance of the patient and that of the controls. We suggest that ANOVA can be used for the comparison of the mean score of an individual with that of a group of controls, but that when there is a difference in variability between the two groups, revised F criteria should be used in order to make the analysis reliable. A table of modified F values is given, which can be used for various departures from homogeneity of variance. [ABSTRACT FROM AUTHOR] |
| Copyright of Cognitive 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: 6687654 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: An evaluation of statistical procedures for comparing an individual's performance with that of a group of controls. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Mycroft%2C+Rachel+H%2E%22">Mycroft, Rachel H.</searchLink><br /><searchLink fieldCode="AR" term="%22Mitchell%2C+Don+C%2E%22">Mitchell, Don C.</searchLink><br /><searchLink fieldCode="AR" term="%22Kay%2C+Janice%22">Kay, Janice</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Cognitive+Neuropsychology%22">Cognitive Neuropsychology</searchLink>. Jun2002, Vol. 19 Issue 4, p291-299. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Cognitive+neuroscience%22">Cognitive neuroscience</searchLink><br /><searchLink fieldCode="DE" term="%22Neuropsychology%22">Neuropsychology</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The single case methodology that is widely used in cognitive neuropsychology often requires a comparison of data from a single individual (the patient) with that from a group of controls, in order to ascertain whether the patient's mean score can be viewed as significantly different from that of controls. This article reviews methods that have been used to deal with such data. Although Analysis of Variance (ANOVA) provides one possible solution of comparing group means, unequal group sizes and differences in variability between patient and controls can violate the assumptions of the test. Using Monte Carlo simulations, it was found that differences in group size and a group of N = 1 did not significantly affect the reliability of the analysis. In contrast, unacceptably high Type I errors were obtained when, in addition to unequal group sizes, there were relatively modest differences between the variance of the patient and that of the controls. We suggest that ANOVA can be used for the comparison of the mean score of an individual with that of a group of controls, but that when there is a difference in variability between the two groups, revised F criteria should be used in order to make the analysis reliable. A table of modified F values is given, which can be used for various departures from homogeneity of variance. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Cognitive 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=6687654 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/02643290143000150 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 291 Subjects: – SubjectFull: Cognitive neuroscience Type: general – SubjectFull: Neuropsychology Type: general Titles: – TitleFull: An evaluation of statistical procedures for comparing an individual's performance with that of a group of controls. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Mycroft, Rachel H. – PersonEntity: Name: NameFull: Mitchell, Don C. – PersonEntity: Name: NameFull: Kay, Janice IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2002 Type: published Y: 2002 Identifiers: – Type: issn-print Value: 02643294 Numbering: – Type: volume Value: 19 – Type: issue Value: 4 Titles: – TitleFull: Cognitive Neuropsychology Type: main |
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