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Using the NEO Personality Inventory-3, we analyzed self/informant agreement on personality traits at three levels that were made statistically independent from each other: domains, facets, and individual items. Cross-rater correlations for the common variance in the five domains ranged from 0.36 to 0.65 (M = 0.49), whereas estimates for the specific variance of the 30 facets ranged from 0.40 to 0.73 (M = 0.56). Cross-rater correlations of residual variance of individual items ranged from -0.14 to 0.49 (M = 0.15; 88% statistically significant at p < 0.002). Agreement on common variance was moderately related to item observability and evaluativeness, whereas variance played a larger role. Facets and even single items detect nuances of personality variation that may merit substantive attention.
