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The role of elevation, scatter, and shape in MMPI profiles
1Department of Psychology, University of Missouri-St. Louis, MO 63121-4499, USA.
Journal of Personality Assessment
|January 1, 1991
Summary
Shape, not scatter, significantly contributes to Minnesota Multiphasic Personality Inventory (MMPI) profile differences across psychiatric and normal groups. These findings support existing classification systems for analyzing MMPI data.
Area of Science:
- Psychological assessment
- Personality research
- Psychometrics
Background:
- The Minnesota Multiphasic Personality Inventory (MMPI) is a widely used tool for psychological assessment.
- Understanding the factors contributing to differences in MMPI profiles is crucial for accurate interpretation.
- Previous research has explored various aspects of MMPI profile analysis.
Purpose of the Study:
- To investigate the relative contributions of profile elevation, scatter, and shape to differences in MMPI profiles.
- To examine these contributions across different samples: psychiatric, normal, and mixed.
- To evaluate the utility of existing classification systems (Skinner, 1976; Lorr, 1982) in explaining MMPI profile variance.
Main Methods:
- Analysis of MMPI profile differences within psychiatric, normal, and mixed samples.
- Quantification of the impact of elevation, scatter, and shape on profile variations.
- Assessment of Skinner's and Lorr's systems for their ability to account for shape variance and classify profiles.
Main Results:
- Profile differences were smallest in the normal sample and largest in the mixed sample.
- Profile shape was the most significant factor contributing to MMPI profile differences.
- Profile elevation played a smaller but significant role, while scatter was of minimal importance.
- Skinner's and Lorr's systems effectively explained a substantial portion of shape variance and aided in profile classification.
Conclusions:
- MMPI profile shape is the primary driver of inter-profile differences, followed by elevation.
- Existing classification systems demonstrate utility in analyzing and describing MMPI profile data.
- These findings have implications for the interpretation and application of MMPI assessments in clinical and research settings.
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