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Have Standard Formulas Correcting Correlations for Range Restriction Been Adequately Tested?: Minor Sampling Distribution Quirks Distort Them
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Johnson, Wendy; Deary, Ian J.; Bouchard, Thomas J., Jr. – Educational and Psychological Measurement, 2018
Most study samples show less variability in key variables than do their source populations due most often to indirect selection into study participation associated with a wide range of personal and circumstantial characteristics. Formulas exist to correct the distortions of population-level correlations created. Formula accuracy has been tested…
Descriptors: Correlation, Sampling, Statistical Distributions, Accuracy
Comparison of Age-Extended Norms for the Wechsler Adult Intelligence Scale-Revised in Patients with Alzheimer's Disease.
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McCurry, Susan M.; And Others – Psychological Assessment, 1994
Intelligence quotient (IQ) scores of 216 elderly Alzheimer's Disease patients based on 3 sets of recent age-extended norms were compared. Results demonstrate the importance of reporting the normative sample on which IQ scores for older adults are based and provide guidelines for selecting a set of age-related norms. (SLD)
Descriptors: Age Differences, Aging (Individuals), Alzheimers Disease, Comparative Analysis
Mayo's Older Americans Normative Studies (MOANS): Factor Structure of a Core Battery.
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Smith, Glenn E.; And Others – Psychological Assessment, 1992
Using the Mayo Older Americans Normative Studies (MOANS) group (526 55-to 97-year-old adults), factor models were examined for the Wechsler Adult Intelligence Scale-Revised (WAIS-R); the Wechsler Memory Scale (WMS); and a core battery of the WAIS-R, the WMS, and the Rey Auditory-Verbal Learning Test. (SLD)
Descriptors: Construct Validity, Diagnostic Tests, Factor Structure, Intelligence