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Related Experiment Videos

Prorating incomplete Wiggins and MacAndrew Scales.

D L Streiner1, H R Miller

  • 1Department of Psychiatry, McMaster University, Hamilton, Ontario, Canada.

Journal of Personality Assessment
|January 1, 1981
PubMed
Summary
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This study provides conversion factors for prorating the Minnesota Multiphasic Personality Inventory (MMPI) Wiggins Content Scales and MacAndrew Alcoholism Scale. Prorated Wiggins scales require cautious interpretation, while the MacAndrew scale is viable with 200 MMPI items.

Area of Science:

  • Psychological assessment
  • Personality testing
  • Clinical psychology

Background:

  • The Minnesota Multiphasic Personality Inventory (MMPI) is a widely used psychological assessment tool.
  • Assessing personality and psychopathology often requires the full MMPI, which can be time-consuming.
  • There is a need for methods to interpret MMPI scales when the complete inventory is not administered.

Purpose of the Study:

  • To develop and evaluate conversion factors for prorating the Wiggins Content Scales and the MacAndrew Alcoholism Scale from the MMPI.
  • To determine the reliability and validity of using partial MMPI data for scale interpretation.
  • To provide guidance on the clinical utility of abbreviated MMPI assessments.

Main Methods:

  • A table of conversion factors was created for prorating scales based on 200 to 400 completed MMPI items.

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  • Statistical analyses including means, standard deviations, and scale comparisons were performed on 236 MMPI profiles.
  • Data were analyzed using various item completion increments (200, 250, 300, 350, 400 items).

    • Main Results:

    • Conversion factors for the Wiggins Content Scales tended to overestimate scale elevations.
    • The MacAndrew Alcoholism Scale demonstrated clinical utility with as few as 200 MMPI items.
    • Prorated Wiggins scales showed potential for overestimation, suggesting a need for careful interpretation.

    Conclusions:

    • The MacAndrew Alcoholism Scale can be reliably used for clinical purposes with a reduced number of MMPI items (≥200).
    • Clinical interpretation of prorated Wiggins Content Scales derived from partial MMPI data should be approached with caution due to potential overestimations.
    • These findings offer practical guidance for clinicians utilizing abbreviated MMPI assessments in specific contexts.