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Continuous norming: implications for the WAIS-R.

R A Zachary, R L Gorsuch

    Journal of Clinical Psychology
    |January 1, 1985
    PubMed
    Summary
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    Continuous norming improves Wechsler Adult Intelligence Scale-Revised (WAIS-R) IQ scores by comparing individuals to their exact age groups. This analytic smoothing method offers more accurate intelligence assessment than traditional tabled norms.

    Area of Science:

    • Psychometrics
    • Psychological Assessment
    • Intelligence Testing

    Background:

    • Traditional age norms in intelligence tests like the Wechsler Adult Intelligence Scale-Revised (WAIS-R) can be imprecise.
    • Existing norm tables often group individuals into broad age bands, leading to potential inaccuracies.

    Purpose of the Study:

    • To illustrate a method for generating continuously adjusted age norms for intelligence tests.
    • To demonstrate procedures for calculating age-adjusted Verbal, Performance, and Full Scale IQ scores using continuous norming.

    Main Methods:

    • Utilized normative data from the Wechsler Adult Intelligence Scale-Revised (WAIS-R).
    • Applied a continuous norming method, building upon Gorsuch's (1983, 1984) approach.
    • Employed an analytic smoothing procedure to refine age adjustments.

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    Main Results:

    • Continuous norming provides more accurate IQ scores compared to traditional tabled norms for the WAIS-R.
    • The method allows for precise comparison of individuals against their exact age cohorts.
    • Demonstrated procedures for calculating age-adjusted IQ scores with a worked example.

    Conclusions:

    • Continuous norming offers a more refined and accurate approach to age adjustment in intelligence testing.
    • This method mitigates inaccuracies inherent in traditional, tabled norming procedures.
    • The illustrated technique enhances the precision of WAIS-R IQ score interpretation.