Abstract
Despite the widespread use of the HEXACO model as a descriptive taxonomy of personality traits, there remains limited information on the test-retest reliability of its commonly-used inventories. Studies typically report internal consistency estimates, such as alpha or omega, but there are good reasons to believe that these do not accurately assess reliability. We report 13-day test-retest correlations of the 100- and 60-item English HEXACO Personality Inventory-Revised (HEXACO-100 and HEXACO-60) domains, facets, and items. In order to test the validity of test-retest reliability, we then compare these estimates to correlations between self- and informant-reports (i.e., cross-rater agreement), a widely-used validity criterion. Median estimates of test-retest reliability were .88, .81, and .65 (N = 416) for domains, facets, and items, respectively. Facets' and items' test-retest reliabilities were highly correlated with their cross-rater agreement estimates, whereas internal consistencies were not. Overall, the HEXACO Personality Inventory-Revised demonstrates test-retest reliability similar to other contemporary measures. We recommend that short-term retest reliability should be routinely calculated to assess reliability.
Highlights
The HEXACO Personality Inventory-Revised (HEXACO-PI-R [1]) is currently one of the most widely used personality questionnaires in psychology and beyond
The finding that facet properties in the HEXACO-60 were consistent with the longer HEXACO-100, despite its being written only to measure domains, may suggest that researchers could consider interpreting facets when measuring the HEXACO domains with the shorter version, this would need to be confirmed by predictive validity studies
Given (1) facet α estimates being generally lower than rTT, (2) the unique, robust association between rTTs and rCAs, and (3) the remarkable replicability of these findings across multiple samples, questionnaires, and even models of personality, we reiterate the growing sentiment that rTT is a superior estimate of scale reliability to α
Summary
The HEXACO Personality Inventory-Revised (HEXACO-PI-R [1]) is currently one of the most widely used personality questionnaires in psychology and beyond. Several key properties of its domain and facet scales such as convergent and discriminant validity, gender differences, and measurement invariance across various countries and translations have been reported in recent large-sample studies [2, 3]. One of the most basic of its psychometric properties, test-retest reliability (or retest reliability; rTT), has rarely been assessed, and never in sufficiently large samples [7,8,9]. Reliability denotes “the consistency of a measure with itself” [10; p.464] or of two independent assessments of the same inventory [11].
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