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The effects of the modifier and correction indices on MCMI-II profiles

H R Miller1, J O Goldberg, D L Streiner

  • 1Department of Psychology, Hamilton Psychiatric Hospital, Ontario, Canada.

Journal of Personality Assessment
|June 1, 1993
PubMed

Insights

The Millon Clinical Multiaxial Inventory-II (MCMI-II) correction indices had minimal impact on patient profiles. Applying a simple procedure to uncorrected scores effectively estimated final base rate (BR) scores, suggesting indices may not be necessary for modifying BR scores.

Area of Science:

  • Psychological Assessment
  • Clinical Psychology
  • Psychometrics

Background:

  • The Millon Clinical Multiaxial Inventory-II (MCMI-II) utilizes modifier and correction indices to enhance scale sensitivity and specificity.
  • Previous research has not definitively established the impact of these indices on clinical profiles.

Purpose of the Study:

  • To evaluate the effect of MCMI-II modifier and correction indices on the profiles of psychiatric inpatients.
  • To determine if these indices significantly alter scale scores and diagnostic codetypes.

Main Methods:

  • Profile analyses were conducted on 141 psychiatric inpatients using the MCMI-II.
  • Comparisons were made between profiles generated with and without the correction and modifier indices.
  • A simple procedure for estimating base rate (BR) scores from uncorrected scores was assessed.

Main Results:

  • MCMI-II correction indices had little effect on the shape and scale differences of patient profiles.
  • Profiles generated with and without indices showed no significant differences.
  • A simple procedure accurately estimated final BR scores from initial, uncorrected scores.
  • 3-point codetypes remained largely consistent, with minor rank order changes.

Conclusions:

  • The MCMI-II correction and modifier indices appear to have limited utility for modifying base rate (BR) scores in this patient population.
  • A simpler method of estimating BR scores from uncorrected scores may be sufficient.
  • Further research is needed to determine the utility of these indices for assessing test-taking attitude.

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