MCMI-III DIAGNOSTIC VALIDITY - BAD TEST OR BAD VALIDITY STUDY

Operating characteristics describe the validity of tests that attempt to dichotomously predict a diagnosis. These statistics are not fully p ublished in the Millon Clinical Multiaxial Inventory-III Manual (MCMI- III manual; Millon, 1994). When calculated from available statistics, the positive predictive powers of the MCMI-III scales are poor both in absolute terms and relative to the MCMI-II (Millon, 1987). There were a number of problems, however, with the initial MCMI-III validity stu dy both inherently and in execution. Although it is doubtful that the MCMI-III is weaker than the MCMI-II, a new validity study is needed.