Paul R. Yarnold
Optimal Data Analysis, LLC
Prior research examined scores on the MacAndrew Alcoholism (MAC) scale for three Minnesota Multiphasic Personality Inventory (MMPI) codetypes within three samples: psychiatric inpatients and outpatients; medical outpatients referred for a psychiatric evaluation; and alcoholic inpatients. Analysis via factorial MANOVA revealed: “Mean MAC scores varied drastically as a function of MMPI codetype, gender, and the specific setting in which the MMPI was administered. These large variations in MAC scores suggest that the use of a single cutting score, typically a raw score of 24 or higher, may be inappropriate” (p. 39). These findings obtained by MANOVA are compared with the findings of novometric statistical analysis for this application.