Evaluation of an MMPI--a short form: implications for adaptive testing

Area of Science:

• Psychology
• Psychometrics
• Adolescent Psychology

Background:

• The Minnesota Multiphasic Personality Inventory (MMPI) has a long history of development, with over 50 years of efforts to create shorter versions.
• Recent advancements focus on computerized adaptive testing to reduce item pool size.

Purpose of the Study:

• To evaluate the psychometric properties of a new short form of the Minnesota Multiphasic Personality Inventory-Adolescent (MMPI-A).
• This short form is based on the first 150 items of the MMPI-A.

Main Methods:

• The study utilized both a normative sample (N=1,620) and a clinical sample (N=565) of adolescents.
• Psychometric properties were assessed using Pearson correlations between full and short-form administrations, mean T-score elevations, and scale congruences.

Main Results:

• The MMPI-A short form demonstrated strong psychometric properties, with high correlations between full and short-form administrations.
• Mean T-score elevations were comparable across both formats, indicating minimal score inflation.
• Analysis of single-scale and 2-point congruences supported the validity of the short form.

Conclusions:

• The 150-item MMPI-A short form is a psychometrically sound alternative for adolescent assessment.
• Findings support the utility of computerized adaptive testing for developing efficient psychological assessment tools.