As one of the few "age neutral " intended personality measurements, the later life context was closely considered during the development of the NEO-PI-R. However, empirical studies measuring Differential Item Functioning (DIF) between younger and older adults on the NEO-PI-R are scarce or non-existent. Our Dutch community-based sample comprised 870 "younger" adults (range: 17-64 years, M=46.01, SD=13.55) and 436 "older" adults (range 65-92 years, M=72.17, SD=5.74). In order to detect possible DIF as a function of age the Mantel Chi-square, the Liu-Agresti Cumulative Common Log-Odds Ratio (L-A LOR), and the Cox's Noncentrality Parameter Estimator (Cox's B) were employed for polytomous items, using DIFAS 5.0 (Penfield, 2007). All three statistics were Bonferroni corrected to minimize the possibility of Type I error. The total domain scores were used as stratifying variables. The initial Mantel Chi-square test of all 240 NEO-PI-R items revealed DIF at the p <0.001 level for 56 items (23.3%). The L-A LOR and the Cox'S B statistics confirmed large DIF for 5 items (12 items when only the L-A LOR statistic was taken into account), and moderate DIF for 27 items. Overall, results indicate that the majority of the NEO-PI-R items were similarly endorsed by younger and older age groups with the same degree of underlying personality trait, corroborating it's age neutrality. However, some items did reveal DIF between the two age groups and will be more extensively discussed during the presentation. Future studies should examine whether DIF is the result of developmental changes or measurement bias.
|Name||15th European Conference on Personality. Program and Abstracts.|
|Conference||Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet|
|Period||21/09/09 → 25/09/09|
Marek Blatny, Martina Hrebickova, Sylvie Kourilova, Alena Slezackova, Petr Kveton, Dalibor Voboril
- Differential Item Functioning
- Age bias