MCMI-III Diagnostic Validity: Bad Test or Bad Validity Study

Abstract

Operating characteristics describe the validity of tests that attempt to dichotomously predict a diagnosis. These statistics are not fully published 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 study 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.

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