Development of a Short Form of the CPAI-A (Form B) with Rasch Analyses

The present study developed and validated a short form of the Cross-Cultural (Chinese) Personality Assessment Inventory for adolescents (CPAI-A; Form B) focusing on the personality scales by unidimensional and multidimensional Rasch models. Multiple evidence from unidimensional Rasch models (item fit, DIF statistics, dimensionality, reliability indices, construct coverage) were evaluated in order to create a short scale with optimal psychometric properties. Further, multidimensional Rasch model, canonical analysis, and predictive validity were performed and evaluated to validate the CPAI-A-SF further. As a result, 65 of 277 items were selected in the short measure with a four-dimensional structure. The infit and outfit mean-squares (MNSQ) of the personality scale items ranged between .81 and 1.25. Good construct coverage was displayed on the item-person map, and all four dimensions demonstrate reasonable EAP/PV reliability ranging from .81 to .87. The personality scores of CPAI-A-SF predicted life satisfaction as well as the scores from the original inventory.