Further evaluation of the CPI Repeated Item Short Form

Area of Science:

• Psychological Assessment
• Personality Measurement
• Psychometrics

Background:

• The California Psychological Inventory (CPI) is a widely used personality assessment tool.
• Short forms of the CPI are desirable for efficiency but require validation.
• The CPI Repeated Item Short Form (RISF) is a recently developed short form.

Purpose of the Study:

• To cross-validate the CPI Repeated Item Short Form (RISF).
• To compare the RISF's performance against the full-length CPI and the Factor Analyzed Short Form (FASF).
• To assess the RISF's validity across different demographic groups.

Main Methods:

• The full-length CPI was administered to three distinct populations: police dispatcher recruits, college students, and penitentiary prisoners.
• Scores for the RISF and FASF were extracted from the full CPI data.
• Comparisons involved intercorrelational matrices, correlations with full CPI scales, and profile validity analyses.

Main Results:

• The RISF demonstrated favorable comparisons across all assessed metrics.
• The RISF showed comparable or superior performance relative to the FASF.
• Profile validity and high/low point matching supported the RISF's efficacy.

Conclusions:

• The CPI Repeated Item Short Form (RISF) is a valid and reliable short form of the California Psychological Inventory.
• The RISF provides a good approximation of full CPI profiles for both institutionalized and non-institutionalized populations.
• The RISF is a practical alternative for personality assessment when time or resources are limited.