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MCMI-III diagnostic validity: bad test or bad validity study

P Retzlaff1

  • 1Department of Psychology, University of Northern Colorado, Greeley 80639, USA.

Journal of Personality Assessment
|April 1, 1996
PubMed

Insights

The Millon Clinical Multiaxial Inventory-III (MCMI-III) shows poor predictive accuracy for diagnoses. A new validity study is essential to confirm its clinical utility and diagnostic performance.

Area of Science:

  • Psychological assessment
  • Clinical psychology
  • Psychometrics

Background:

  • Operating characteristics are crucial for evaluating diagnostic test validity.
  • Key validity statistics for the Millon Clinical Multiaxial Inventory-III (MCMI-III) are not fully published.
  • Previous versions, like the MCMI-II, provide a comparative baseline.

Purpose of the Study:

  • To calculate and assess the operating characteristics, specifically positive predictive power, of the MCMI-III scales.
  • To compare the MCMI-III's predictive validity against the MCMI-II.
  • To identify limitations in the initial MCMI-III validity study.

Main Methods:

  • Calculation of positive predictive powers from available MCMI-III statistics.
  • Comparison of calculated MCMI-III statistics with published MCMI-II data.
  • Critical review of the methodology and execution of the MCMI-III validity study.

Main Results:

  • The positive predictive powers of the MCMI-III scales are inadequate in absolute terms.
  • MCMI-III's predictive validity is poor relative to the MCMI-II.
  • The initial MCMI-III validity study had inherent and execution-related flaws.

Conclusions:

  • The MCMI-III demonstrates poor diagnostic predictive power based on available data.
  • Concerns exist regarding the methodology of the MCMI-III's initial validity assessment.
  • A new, rigorous validity study is required to ascertain the MCMI-III's true clinical utility.

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