Diagnostic validity of the MMPI and two short forms

The ability of the Faschingbauer Abbreviated MMPI (FAM) and the MMPI-168 to substitute for the full Minnesota Multiphasic Personality Inventory (MMPI) in broad psychiatric diagnosis was examined in a sample of 514 psychiatric inpatients. Each sex was randomly divided and multiple discriminant functions derived using long form scales as predictors. The discriminant functions were cross-validated on the other same-sex group using long and short form scales as predictors. All three forms achieved a 46% "hit" rate overall. No significant differences among the three forms were found.     

Use of local norms to improve configural reproducibility of an MMPI short form

Short forms of the MMPI have been criticized due to their inability to adequately reproduce the profiles of the full length version of the MMPI Oftentimes these short forms are used with subject populations dissimilar to the population upon which the short form was originally standardized. This study evaluates the effect of using local norms with one of these short forms (the FAM) upon the concordance rates of profile code-types with the original full-length MMPI profile. Single point, first 2 high-point and first 3 high-point code-types were found to have higher concordance rates when using local norms. Use of local norms for short MMPI forms may compensate, in part, for information lost in the shortening.     

Partial Confirmatory Factor Analysis: Described and Illustrated on the NEO–PI–R

Short forms of the MMPI have been criticized due to their inability to adequately reproduce the profiles of the full length version of the MMPI Oftentimes these short forms are used with subject populations dissimilar to the population upon which the short form was originally standardized. This study evaluates the effect of using local norms with one of these short forms (the FAM) upon the concordance rates of profile code-types with the original full-length MMPI profile. Single point, first 2 high-point and first 3 high-point code-types were found to have higher concordance rates when using local norms. Use of local norms for short MMPI forms may compensate, in part, for information lost in the shortening.     

MMPI short forms with adolescents: gender differences in accuracy

The influence of gender on accuracy for eight short forms of the Minnesota Multiphasic Personality Inventory (MMPI) was investigated using a sample of adolescents. MMPI responses from 318 male and 248 female psychiatric patients, aged 12 to 17, were scored for the standard MMPI, Mini-Mult (using two methods; Kincannon, 1968), Midi-Mult (Dean, 1972), two Maxi-Mults (McLachlan, 1974; Spera & Robertson, 1974), Hugo Short Form (Hugo, 1972), Faschingbauer Abbreviated MMPI (FAM; Faschingbauer, 1974), and MMPI-168 (Overall & Gomez-Mont, 1974). Discrepancy values were obtained for all short-form T-scores by subtracting each short-form T-score from its corresponding standard form T-score. These discrepancy values were analyzed using Gender x Short Form repeated measures multivariate analyses of variance (MANOVAs). Because the number of scales varied among the short forms, two separate analyses were performed, one containing all short forms but only the 11 scales that appeared on all short forms and the other containing all scales but only the three short forms that contained all scales. McLachlan's (1974) Maxi-Mult was excluded from the analysis because of its nearly identical statistical properties to Spera and Robertson's (1974) Maxi-Mult. The interaction was significant on most scales in both analyses. Simple-effects breakdowns of the interactions revealed that the accuracy of each short form differed according to gender on several scales, following no consistent pattern. The Midi-Mult and Maxi-Mult are guardedly recommended as the short forms with the lowest number of scales showing a gender difference; however, the reader is cautioned that this difference is still present in more than one third of the scales. Further research on short-form development is advocated.     

Sensitivity of the Faschingbauer abbreviated MMPI to hospitalized adolescents

Comparisons were obtained between Faschingbauer's abbreviated MMPI (FAM) and the standard MMPI for a sample of hospitalized adolescent psychiatric patients. The results showed close statistical correspondence, highly correlated scale group means, and high comparability in identifying valid and invalid profiles. Additionally, the FAM was successful in predicting several gross indices of psychopathology as well as high-point elevations on the standard-form MMPI. A replication supported the stability of these findings.     

Factor comparison of two Minnesota Multiphasic Personality Inventory short forms

A sample of 315 valid Minnesota Multiphasic Personality Inventory (MMPI) protocols were selected from inpatient files and scored for both the MMPI-168 and Faschingbauer Abbreviated MMPI short forms. Each short form was then factor-analyzed by a principal axis strategy with varimax rotation. The six factors extracted from each short form were then compared as to their similarity by use of the s index. This procedure showed five of the six factors in each short form as having a significant relationship of the pattern of salient variables they had in common with the complimentary factors of the other form. These data suggest that both short forms, though based on different construction methodologies, share the same underlying personality attributes. Future research is suggested to replicate these results and extend them to the full MMPI.     

Ideal-self Responding on the MMPI

The MMPI was administered to 29 college students under standard and ideal-self instructions in order to determine whether or not there is agreement as to what constitutes favorable adjustment. A profile analysis of the ideal-self responses yielding an intraclass correlation of .62 (p < .001). This result substantiates previous studies suggesting that an identifiable profile exists. Items changed between the self and ideal administrations were analyzed for their social favorability, interpretive ambiguity, obviousness, and scale membership. The first three factors were found to significantly influence responding under the ideal-self set. Implications of such item changes and of ideal-self profile were discussed.     

Evaluating the Similarity of MMPI-2 and MMPI Profiles: Reply to Dahlstrom and Humphrey

We review issues that have arisen in exchanges with Dahlstrom and Humphrey (Dahlstrom & Humphrey, 1996; Humphrey & Dahlstrom, 1995) about assessing the comparability of the Minnesota Multiphasic Personality Inventory-2 (MMPI-2) and the MMPI. We point out the limitations of Q correlations (without contending that D² is "the only legitimate function of profile comparability," as Dahlstrom and Humphrey, 1996, p. 350, claim we do), and explain why Dahlstrom and Humphrey's (1996) new Q-correlational results, correctly interpreted, are consistent with our own previous observations and conclusions. We stress again the importance of both overall profile elevation and profile "definition" in making code-type assignments. Nonrestrictive code types ignore these profile characteristics, and their use needlessly lowers MMPI-2/MMPI code-type congruences and raises the incidence of profile misinterpretations. Our recommendation of well-defined MMPI-2 code types stands.     

The predictive efficacy of three MMPI short forms

Summary: In order to investigate the predictive efficacy of three MMPI short forms, the standard form answer sheets of 50 inmate volunteers and 44 clinic outpatients were scored separately for Faschingbauer's, Hugo's and Mini-Mult scales. T-score correlations and t tests between the standard form and each short form, as well as comparisons using Lacks' criteria were reported. Results indicated that the Faschingbauer form w;ls superior to the other two forms. Results were discussed in terms of the populations tested and in reference to the different methodologies used in developing each of the short forms.     

MMPI Response-Set Characteristics Among Adolescents

This study examined the Minnesota Multiphasic Personality Inventory (MPPI) profile characteristics for five different response sets in adolescent populations employing adolescent MMPI norms. In general, findings for "all-true" and "all-false" adolescent profiles were highly similar in shape and elevation to those reported in the adult literature (Graham, 1977; Lachar, 1974), whereas random profiles on adolescent norms differed substantially from adult-norm random profiles in shape but not elevation. The characteristics of "fake good" or "fake bad" response sets were investigated by the use of adolescent subjects in two settings. Ninety-four public high-school students were administered the MMPI with standard and "fake bad" instructions, and 24 adolescents in inpatient psychiatric treatment were administered the MMPI under standard and "fake good" instructions. The MMPI profiles generated by special instructional sets were analyzed in relation to the subject's age, sex, race, and actual MMPI profile features. Findings indicated that although sex and race effects were evident in normal adolescents' attempts to simulate psychopathology on the MMPI, teenagers generally produce profiles containing grossly exaggerated symptom patterns that are relatively easy to detect as invalid. In contrast, it was found that a substantial number of psychiatrically disturbed adolescents may effectively simulate normal profiles and that effectiveness in these attempts was related to greater age and lower actual MMPI T-score values on the Hs and Hy scales.     

The Natural History of an Outcome Prediction

This study investigated the relationship between accuracy in figure drawing interpretation and interpersonal style. Subjects were 66 undergraduates who completed the Minnesota Multiphasic Personality Inventory (MMPI), the Interpersonal Check List (ICL), and a figure drawing interpretation task. The MMPI and ICL were scored and interpreted using Leary's Interpersonal System, which provides for a multilevel assessment of interpersonal functioning. Interpretive skill was found to be associated with "affiliative" interpersonal styles (p < .05), and lack of interpretive skill was associated with "disaffiliative" interpersonal styles (p < .05) at two of the three levels examined. The role of unconscious processes in figure drawing interpretation, the nature of the interpretive process, and implications for the selection of skilled interpreters are discussed with reference to the interpersonal characteristics of the interpreter.     

An MMPI Typology of Cocaine Abusers

Three types were found in a cluster analysis of scores on the Minnesota Multiphasic Personality Inventory (MMPI) of 100 men voluntarily presenting for treatment of cocaine abuse. Type 1 (n = 59) had a mean MMPI profile consistent with the hypothesized grouping of persons who self-medicate with cocaine as a means of overcoming depression. The relatively normal mean MMPI profile obtained by Type 2 (n = 37) suggested little indication of significant psychopathology. Type 3's (n = 4) mean MMPI profile suggested either severe disturbance or profile invalidity. Types were found to differ in the nature of drug use, reactions to cocaine, education level, and social class, but not on the scales of the Adjective Check List.     

Rorschach movement and color responses and MMPI social extraversion and thinking introversion personality types

Results of an analysis of MMPI profiles and Rorschach protocols scored by the Exner method for 100 psychiatric patients provided partial support for Rorschach's hypotheses that perceptions of color (FC, CF, and C) and movement (M) tap separate personality dimensions. First, the proportion of M responses on a protocol correlated significantly (p < .01) to thinking introversion as defined in terms of a subject's MMPI profile similarity to a prototypic MMPI profile with peak PtSc elevations. Second, the proportion of FC responses correlated negatively (p < .01) to social extraversion defined in terms of MMPI profile similarity to a prototypic MMPI profile with peak PdMa elevations. Hence, use of FC signified a socially reserved, controlled behavior. The findings regarding CF and C were inconclusive. Third, color and movement responses did not correlate significantly with somatization defined in terms of similarity to a prototypic MMPI profile with peak Hs, D, Hy elevations. Finally, the nonsignificant correlations of FC with M and with MMPI thinking introversion plus the nonsignificant correlation of M with color responses and MMPI social extroversion further supported the hypotheses that movement and color responses tap essentially unique personality dimensions.     

MMPI Configural Interpretation as Applied to Posttraumatic Stress Disorder in Vietnam Veterans

This study investigated the systems of Minnesota Multiphasic Personality Inventory (MMPI) configural interpretation of Skinner and Jackson (1978) and Kunce (1979) with Vietnam veterans with posttraumatic stress disorder (PTSD). MMPI profiles of four groups differing in combat exposure were compared on four MMPI configural variables from Kunce (1979) and Skinner and Jackson (1978). The four groups were (a) PTSD sufferers, (b) Vietnam combat veterans without PTSD, (c) Vietnam noncombat veterans, and (d) Vietnam era veterans. All groups were further divided into hospitalized versus nonhospitalized subgroups. Dependent variables were Skinner and Jackson's (a) sociopathic modal profile, (b) neurotic profile, (c) psychotic profile, and (d) Kunce's emotional expression (enthusiastic-reserved) dimension. Results indicated that hospitalized PTSD subjects had significantly higher scores on Skinner and Jackson's neurotic profile; both hospitalized and nonhospitalized PTSD subjects had higher scores on the psychotic profile and were more "reserved" on Kunce's emotional expression dimension. Results were interpreted in terms of configural MMPI interpretation systems and the adjustment of Vietnam veterans with PTSD. PTSD was viewed as exhibiting cognitive, somatic, and affective features.     

Comparability of MMPI and MMPI-2 profile patterns: Ben-Porath and Tellegen's inappropriate invocation of Mahalanobis's D2 function

Ben-Porath and Tellegen (1995) claimed that the data in the article by Humphrey and Dahlstrom (1995) were improperly analyzed by means of Q correlations between raw scores earned by the individuals in the forensic sample to establish pattern comparability between the original Minnesota Multiphasic Personality Inventory (MMPI; Hathaway & McKinley, 1943) and the Minnesota Multiphasic Personality Inventory-2 (MMPI-2; Butcher, Dahlstrom, Graham, Tellegen, & Kaemmer, 1989), which were then contrasted with Q correlations between the corresponding T-score patterns. Ben-Porath and Tellegen (1995) contended that the Q correlation is affected by random factors and that a generalized distance function, D2, is the only legitimate index of profile comparability. Data are presented here to show that the Q correlation serves as a reliable index of pattern comparability, relatively unaffected by differences in profile elevation. The Mahalanobis (1936) D2 index is too heavily weighted with differences in profile elevation serve as the proper index of equivalence in profile patterning. The findings in the Humphrey and Dahlstrom (1995) article were based on appropriate data-analytic procedures because the primary concern is their investigation was the extent to which the patterns of T-score profiles from the original MMPI and the MMPI-2 are comparable when the raw-score patterns are virtually identical.     

Comparability of MMPI and MMPI-2 Profile Patterns: Ben-Porath and Tellegen's Inappropriate Invocation of Mahalanobis's D² Function

Ben-Porath and Tellegen (1995) claimed that the data in the article by Humphrey and Dahlstrom (1995) were improperly analyzed by means of Q correlations between raw scores earned by the individuals in the forensic sample to establish pattern comparability between the original Minnesota Multiphasic Personality Inventory (MMPI; Hathaway & McKinley, 1943) and the Minnesota Multiphasic Personality Inventory-2 (MMPI-2; Butcher, Dahlstrom, Graham, Tellegen, & Kaemmer, 1989), which were then contrasted with Q correlations between the corresponding T-score patterns. Ben-Porath and Tellegen (1995) contended that the Q correlation is affected by random factors and that a generalized distance function, D², is the only legitimate index of profile comparability. Data are presented here to show that the Q correlation serves as a reliable index of pattern comparability, relatively unaffected by differences in profile elevation. The Mahalanobis (1936) D² index is too heavily weighted with differences in profile elevation serve as the proper index of equivalence in profile patterning. The findings in the Humphrey and Dahlstrom (1995) article were based on appropriate data-analytic procedures because the primary concern is their investigation was the extent to which the patterns of T-score profiles from the original MMPI and the MMPI-2 are comparable when the raw-score patterns are virtually identical.     

Subtle-Obvious Scales of the MMPI: Indicators of Profile Validity in a Psychiatric Population

This study explored the usefulness of the Minnesota Multiphasic Personality Inventory (MMPI) Subtle-Obvious scales as profile validity indicators with a inpatient psychiatric population. Some 292 MMPI profiles were utilized and divided into overreporters, underreporters, and standard reporters, based on their Subtle-Obvious scale scores. Reporting style was shown to be unrelated to actual patient pathology because of the lack of relationship between reporting style and diagnostic categorization according to the Diagnostic and Statistical Manual of Mental Disorders (3rd ed., rev. [DSM-III-R]; American Psychiatric Association, I987) Axis I and II. Comparisons of MMPI profiles of the three groups revealed that overreporters endorsed more pathology on the MMPI clinical scales than did either underreporters or standard reporters. The same pattern of response style was demonstrated by subjects on another objective measure, the Beck Depression Inventory, whereas on a projective measure, the Rorschach Inkblot Test, there were no differences between groups. These findings suggest that clinicians may want to utilize the Subtle-Obvious scales to gain information about MMPI profile validity. Specifically, profiles of patients identified as overreporters should be interpreted with caution so as to not overstate their level of pathology.