Validation of an ipsative personality measure (DISCUS).

The purpose of this study was to examine the construct validity of an ipsative personality test (DISCUS), and various effects of the ipsative format of the test. Both an ipsative and a normative version of the DISCUS test was administered to a sample of undergraduate students (N = 103), along with an adjective based personality test that measures the Big-Five personality traits (5PFa). The results indicated that the normative and the ipsative version of DISCUS are not equivalent, and caution is needed when using the ipsative version for psychometric evaluations as in validation studies. The four DISCUS dimensions (Dominance, Influence, Stability, and Carefulness) represented combinations of the Big-Five traits rather than independent traits as indicated by the correlations with the Big-Five measure.