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Mental retardation and WAIS-R scatter analysis
1Surrey Place Centre, Toronto, Ontario, Canada.
Journal of Intellectual Disability Research : JIDR
|October 1, 1992
Summary
This study provides reliability estimates for comparing individual Wechsler Adult Intelligence Scale-Revised (WAIS-R) subtest scores to the overall mean. Clinicians can now assess the statistical significance of these specific score differences in examinees.
Area of Science:
- Psychometrics
- Neuropsychological Assessment
Background:
- Previous research examined psychometric properties of Wechsler Adult Intelligence Scale-Revised (WAIS-R) subtest difference scores in individuals with IQ < 80.
- Established methods allowed practitioners to determine the statistical reliability of differences between two WAIS-R subtests.
Purpose of the Study:
- To extend previous psychometric analyses of the WAIS-R.
- To provide reliability estimates for the difference between a single WAIS-R subtest score and the mean of all subtest scores.
- To enable clinicians to ascertain the statistical significance of these specific score differences for individual examinees.
Main Methods:
- Calculated reliability estimates for single subtest versus mean score differences.
- Utilized data from a sample relevant to clinical practice.
Main Results:
- Presented a set of reliability estimates for single WAIS-R subtest to mean score differences.
- Developed a tool for clinicians to evaluate the statistical significance of these differences.
Conclusions:
- The study extends the utility of WAIS-R psychometric data for clinical interpretation.
- Clinicians are equipped with new data to assess the significance of individual WAIS-R subtest score variations relative to the examinee's overall performance.
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