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Continuous norming: improved equations for the WAIS-R

R Taylor1

  • 1Department of Clinical Neurosciences, Western General Hospital, Edinburgh, UK.

The British Journal of Clinical Psychology
|December 18, 1998
PubMed
Summary
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New continuous norming equations for the Wechsler Adult Intelligence Scale-Revised (WAIS-R) IQ scores offer improved accuracy over previous methods. These equations also provide better calculations for individual subtest scores.

Area of Science:

  • Psychometrics
  • Psychological assessment

Background:

  • Existing norming equations for the Wechsler Adult Intelligence Scale-Revised (WAIS-R) may not provide optimal accuracy.
  • There is a need for improved methods to calculate IQ scores and subtest scores.

Purpose of the Study:

  • To develop more accurate continuous norming equations for WAIS-R IQ scores.
  • To create additional equations for WAIS-R subtest scores.

Main Methods:

  • Psychometric analysis of published normative data.
  • Multiple regression analysis of WAIS-R data from Wechsler (1981).
  • Inclusion of score and age transformations in the analysis.

Main Results:

  • The newly derived continuous norming equations demonstrate good performance.

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  • Computational details for the equations are provided.

    • Conclusions:

    • Continuous norming offers practical and theoretical benefits for psychological assessment.
    • The developed equations provide a closer fit to WAIS-R data than prior equations.
    • The methodology may be adaptable to other normative datasets.