Linguistic Measurement Invariance and Stability-Equivalence of the Personality Inventory for DSM-5 Among Bilingual Participants.

The linguistic equivalence of the Personality Inventory for DSM-5 (PID-5) has never been investigated using a within-subject design, that is, among bilingual individuals. Also, the stability-equivalence of the PID-5 using two linguistic versions is unknown. Thus, this within-subject, test-retest study aims at (a) establishing the measurement invariance of the PID-5 among bilinguals, and (b) providing indices of stability-equivalence using distinct versions with tight confidence intervals. Data from a sample of bilingual participants (N = 605), who were administered the PID-5 over a 1-2-week interval in French and English, were utilized. The PID-5 reached the (full) strong invariance level using longitudinal invariance analyses, indicating that the PID-5 structure is the same and that scores are interchangeable, while controlling for sampling confounds. The indices of stability-equivalence were high across traits. The PID-5 yields scores reflective of genuine differences, at least at the domain level, providing solid ground to study personality across societies.