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Researchers created an 18-item personality scale, the HEX-ACO-18, that remains consistent across different ages. This short form of the HEXACO Personality Inventory is ideal for developmental research.

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Area of Science:

  • Psychology
  • Personality Science
  • Psychometrics

Background:

  • The HEXACO Personality Inventory (HEXACO-PI) is a comprehensive measure of personality traits.
  • Developmental personality research requires personality measures that are invariant across age groups.
  • Existing measures may not be suitable for continuous age analysis, necessitating new scale development.

Purpose of the Study:

  • To develop an age-invariant, brief version of the HEXACO Personality Inventory.
  • To optimize item selection for model fit, measurement invariance, and construct coverage.
  • To create a tool for robust developmental personality research.

Main Methods:

  • Utilized ant colony optimization (ACO) for item selection, optimizing for scale quality.
  • Employed local structural equation modeling (LSEM) for age-invariant model estimation.
  • Applied these methods to a large dataset (N=6,419) spanning ages 16 to 90.

Main Results:

  • Developed the HEX-ACO-18, an 18-item short form of the HEXACO Personality Inventory.
  • Achieved adequate model fit and scalar measurement invariance across the age range.
  • Demonstrated the utility of ACO and LSEM for personality scale development.

Conclusions:

  • The HEX-ACO-18 provides a brief, age-invariant measure for personality research.
  • The combined ACO and LSEM approach is effective for developing psychometrically sound personality scales.
  • This short scale facilitates efficient and accurate developmental personality research.