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Using the Big Five personality model instead of the HEXACO model results in significant information loss. This loss is comparable to omitting an entire Big Five personality trait scale.

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Area of Science:

  • Psychology
  • Personality Science
  • Psychometrics

Background:

  • The Big Five personality model is widely used, but the HEXACO model offers a more comprehensive structure.
  • Understanding the overlap and unique variance between these models is crucial for personality assessment.

Purpose of the Study:

  • To quantify the variance accounted for between Big Five and HEXACO Personality Inventory-Revised (HEXACO-PI-R) scales.
  • To assess the information loss when using Big Five measures instead of HEXACO-PI-R.

Main Methods:

  • Statistical analysis comparing the predictive ability of Big Five measures on HEXACO-PI-R scales.
  • Comparison of variance explained in HEXACO scales by different Big Five measures.
  • Assessment of reciprocal variance explained by HEXACO-PI-R scales on Big Five measures.

Main Results:

  • Big Five measures showed varying success in explaining HEXACO Honesty-Humility, but this was offset by lower explanatory power for Agreeableness and Emotionality.
  • Overall, Big Five measures demonstrated significant deficiencies in accounting for HEXACO scale variance.
  • HEXACO-PI-R scales accounted for substantially more variance in Big Five scales than vice versa.

Conclusions:

  • Employing the Big Five model instead of the HEXACO model leads to a considerable loss of personality information.
  • This information loss is substantial, equivalent to discarding one of the Big Five personality dimensions.