Temporal Stability of the Personality Assessment Inventory: Investigating Potential Predictors

Area of Science:

• Psychological Assessment
• Psychometrics
• Personality Research

Background:

• The Personality Assessment Inventory (PAI) is a widely used psychological assessment tool.
• Its temporal stability has not been thoroughly re-evaluated since its initial publication.

Purpose of the Study:

• To assess the utility of PAI validity indicators (ICN, INF) in detecting suspect responding.
• To calculate the temporal stability coefficients for PAI scales and subscales over 3-, 6-, and 9-week intervals.
• To investigate the prospective predictability of PAI profile stability across multiple measurements.

Main Methods:

• Administered the PAI to 579 undergraduates at four distinct time points.
• Analyzed the effectiveness of inconsistent (ICN) and highly unusual/unlikely (INF) response indicators.
• Calculated test-retest reliability coefficients for all PAI scales and subscales.
• Examined correlations between clinical scales and profile instability, controlling for mean clinical elevation.

Main Results:

• ICN and INF indicators successfully identified inconsistent and suspect responders.
• Most PAI full scales and subscales exhibited strong test-retest reliability.
• PAI clinical scales correlated with profile instability, though this effect diminished when controlling for mean clinical elevation.

Conclusions:

• PAI validity scales are useful for identifying problematic response patterns.
• The PAI demonstrates robust temporal reliability, supporting its use in longitudinal studies.
• Psychopathology influences response variability over time, which may be prospectively predictable and reflect genuine changes.