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Assessment
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Internal and Temporal Reliability Estimates for Informant Ratings of Personality Using the NEO PI-R and IAS

John E. Kurtz

Patricia A. Lee

Jennifer L. Sherker

Villanova University

This study examines the internal consistency and temporal stability of informant ratings from two widely used instruments for normal personality assessment, the revised NEO Personality Inventory (NEO PI-R) and the Interpersonal Adjective Scales (IAS). Wellknown adult targets were selected by 109 undergraduate students and rated on two occasions separated by a 6-month interval. With few exceptions, estimates of internal consistency are adequate to good for both instruments. NEO PI-R domain scores yield coefficient alphas ranging from .89 to .96, with a median of .80 for the 30 facet scales. 1AS octant scales show coefficient alphas ranging from .83 to .92. Retest Pearson correlations are above .70 for each of the NEO PI-R domain scores and both IAS axis coordinates, and intraclass correlations are above .60 for all scales from both instruments. Score changes were small but statistically significant for three of the five NEO PI-R domains at retest. The retest stability of IAS type classifications varies as a function of the extremity of the associated octant scores.

Key Words: informant assessment • five-factor model • interpersonal circumplex

Assessment, Vol. 6, No. 2, 103-113 (1999)
DOI: 10.1177/107319119900600201
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