An investigation of heterogeneity through personality assessment in a male inpatient alcoholic population

Date of Award




Degree Name

Doctor of Philosophy (Ph.D.)

First Committee Member

Theodore Millon - Committee Chair

Second Committee Member

Robert Davidson - Committee Member


MCMI and MMPI data were obtained from 294 male veteran alcoholic inpatients. MMPI data was classified according to Conley's (1981) classification system, generally replicating his results. The MCMI was cluster analyzed utilizing two independent clustering systems, with the results of the two clustering solutions being equivalent. Results indicate that the MCMI is able to identify distinct subgroups in an alcoholic population, yielding four independent groups through cluster analysis. Frequency distributions indicated the presence of the four major Millon (1968) classifications; Detached, Dependent, Independent, and Ambivalent, although the Independent and Ambivalent types are most common. The MCMI is also able to improve on the classification power of the MMPI by classifying 41% of the MMPI unclassified group. This study further supports the "Neurotic"-"Character Disorder" dichotomy which is present in the literature. The MCMI very clearly differentiates this population into two main camps which are reminiscent of these distinctions. Furthermore, the MCMI's theory backing provides viable hypotheses concerning etiology, appropriate treatment and prognosis of the alcoholic subtypes identified. These are presented and discussed.


Psychology, Personality

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