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CAT-PD and MMPI-3 Validity Scales Detect Simulated Overreporting and Underreporting.

Omeed Tartak1, Leah T Emery1, Leonard J Simms1

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The Comprehensive Assessment of Traits relevant to Personality Disorder (CAT-PD) and Minnesota Multiphasic Personality Inventory-3 (MMPI-3) validity scales effectively identify dishonest responses. These scales accurately detect overreporting and underreporting in psychological assessments.

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Area of Science:

  • Psychological assessment
  • Psychometrics
  • Forensic psychology

Background:

  • Psychological tests are susceptible to response bias, influencing critical decisions.
  • Validity scales are crucial for detecting dissimulation in assessments like the MMPI-3 and CAT-PD.
  • Limited research exists on the validity scales of the MMPI-3 and CAT-PD compared to earlier versions.

Purpose of the Study:

  • To evaluate the efficacy of CAT-PD and MMPI-3 validity scales in distinguishing credible from noncredible responders.
  • To assess the ability of these scales to detect overreporting and underreporting in a simulated nonclinical environment.

Main Methods:

  • A simulation design involving 484 participants (undergraduates and crowd-sourced adults).
  • Participants were randomly assigned to respond honestly, overreport, or underreport on the MMPI-3 and CAT-PD.
  • Receiver operating characteristic (ROC) curves were used to estimate classification accuracy.

Main Results:

  • Overreporters and underreporters showed significantly higher validity scale scores compared to honest responders (Cohen's d range = 1.04–4.87).
  • Noncredible responding significantly biased substantive scale profiles on both instruments.
  • CAT-PD validity scales exhibited convergent and discriminant validity with MMPI-3 validity scales, with similar ROC accuracy.

Conclusions:

  • The CAT-PD and MMPI-3 validity scales are effective in detecting noncredible responding in a simulated nonclinical setting.
  • These findings support the utility of both instruments' validity scales for ensuring response integrity in psychological evaluations.