FACTOR STRUCTURE O F THE MMPI IN A PSYCHIATRIC POPULATION.

Area of Science:

• Psychology
• Psychometrics

Background:

• The Minnesota Multiphasic Personality Inventory (MMPI) is a widely used psychological assessment tool.
• Factor analysis is a statistical method used to identify underlying dimensions in a set of observed variables.

Purpose of the Study:

• To conduct a multi-stage factor analysis of the 373-item short form of the MMPI.
• To identify and validate underlying factors within the MMPI.
• To assess the utility of an abbreviated MMPI form (MMPI-168).

Main Methods:

• Multi-stage factor analysis was applied to the 373-item MMPI short form.
• Item-level analyses were conducted and compared with previous findings.
• Scoring keys, 2'-score profile sheets, and T-score equivalents were developed.

Main Results:

• Six distinct factors were identified: Somatization, Feminine Interests, Depression, Psychotic Distortion, Low Morale, and Acting Out.
• These factors align with previous item-level analyses and author findings.
• The MMPI-168 demonstrated a consistent factor structure with the longer MMPI form.

Conclusions:

• Factor scoring of the MMPI offers a more simplified approach to pattern interpretation.
• The MMPI-168 is a viable alternative for situations requiring abbreviated administration.
• The identified factors provide a robust structure for understanding MMPI data.