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Direct linkJohnson, 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
Peer reviewedGrossman, Fred M. – Journal of Consulting and Clinical Psychology, 1983
Performed computations for each of nine age groups to determine the frequency in the standardization sample of specific Verbal-Performance discrepancies on the Wechsler Adult Intelligence Scale-Revised (WAIS-R). Discusses the importance and possible applications of such frequency data. (WAS)
Descriptors: Intelligence Tests, Performance Tests, Psychometrics, Standardized Tests
