Millon MCMI Scales Factor Analyzed and Correlated with MMPI and CPS Scales.

The Millon MCMI was administered in translation to 527 applicants for drivers' licenses in Israel who were required to undergo psychological screening. Three hundred of these subjects also took the Comrey Personality Scales (CPS) and the other 227 also took the MMPI. A factor analysis of the 20 MCMI scales was carried out and these scales were also correlated with the CPS and MMPI scales. A meaningful five-factor solution was obtained and canonical correlations were computed between the MCMI scales and those from the other two tests. Evidence from this and previous studies suggests that the MCMI scales overlap each other more than they should for purposes of optimum differential diagnosis.