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Abstract

Distributions of all possible split-half correlations for the Harris and Lingoes, Wiggins, and Serkownek Scales of the MMPI that contained twelve items or fewer revealed significant negative skewness that resulted in spuriously lowered estimates of reliability. Corrections based on the optimized r₁₁ increased the average Subscale split-half correlation from an alpha of .409 (or the average odd-even split of .411) to a maximized r₁₁ of .604. Generally, reliability of scales, with the maximized r₁₁ increased to levels acceptable for research purposes. It was concluded that research scales of the MMPI show split-half distributional anomalies which should dictate the use of maximized r₁₁ to estimate internal consistency. It is suggested that these findings might be taken into consideration in the evaluation of the new MMPI.

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References

American Educational Research Association, American Psychological Association, and National Council on Measurement in Education . (1985). Standards for educational and psychological testing. Washington, D.C.: American Psychological Association.

Butcher, J. N. (Ed.) (1969). MMPI: Research developments and clinical applications. New York: McGraw-Hill.

Cronbach, L. J. (1943). On estimates of test reliability. The Journal of Educational Psychology, 34, 485-494.

Dahlstrom, V. G. , Welsh, G. S. and Dahlstrom, L. E. (1975). An MMPI handbook: Vol. II. Research applications. Minneapolis: University of Minnesota Press.

Duckworth, J. and Anderson, W. (1986). MMPI interpretation manual for counselors and clinicians. (3rd Ed.) Muncie, Ind.: Accelerated Development.

Gocka, E. (1965). American Lake norms for 200 MMPI scales. Unpublished materials, Veterans Administration Hospital, American Lake, WA.

Graham, J. R. (1987). The MMPI: A practical guide. (2nd Ed.). New York: Oxford University Press.

Guttman, L. (1945). A basis for analyzing test-retest reliability. Psychometrika, 10, 255-282.

Harris, R. and Lingoes, J. (1960). Subscales for the Minnesota Multiphasic Personality Inventory. Unpublished manuscript, University of California, Los Angeles.

10.

Hathaway, S. R. and McKinley, J. C. (1943). The Minnesota Multiphasic Personality Inventory. New York: Psychological Corporation.

11.

Kendall, M. and Stewart, A. (1977). The advanced theory of statistics. (Vol. 1). New York: MacMillan.

12.

Koss, M. P. (1979). MMPI item content: Recurring issues. In J. N. Butcher (Ed.). New developments in the use of the MMPI. (Pp. 3-38). Minneapolis: University of Minnesota Press.

13.

Levitt, E. E. and Duckworth, J. C. (1984). Minnesota Multiphasic Personality Inventory. In D. J. Keyser and R. C. Sweetland (Eds.). Test critiques (Vol 1). (Pp. 466-472). Kansas City, MO: Test Corp. of America.

14.

Matarazzo, J. D. (1986). Computerized clinical psychological test interpretations: Unvalidated plus all mean and no sigma. American Psychologist, 41, 14-24.

15.

Mitchell, J. V., Jr. (Ed.). (1985). The Ninth Mental Measurements Yearbook (Vols. 1, 2). Lincoln: University of Nebraska Press.

16.

Rorschach, H. (1942). Psychodiagnostics. Translated by P. Lerner and B. Kronenberg. New York: Grune and Stratton.

17.

SPSS, Inc. (1983). SPSSX user's guide. New York: McGraw-Hill.

18.

Serkownek, J. (1975). Subscales for 5 and 0. Unpublished manuscript. Cleveland Heights, Ohio.

19.

Wagner, E. E. , Alexander, R. A. , Roos, G. , and Prospero, K. (1985). Maximized split-half reliability estimates for projective techniques. Journal of Personality Assessment, 49, 579-581.

20.

Wagner, E. E. , Alexander, R. A. , Roos, G. , and Adair, H. (1986). Optimum split-half reliabilities for the Rorschach: Projective techniques are more reliable than we think. Journal of Personality Assessment, 50, 107-112.

21.

Wagner, E. E. , Greene, R. S. , Adair, H. E. , and Dawson, J. (1987). Maximized reliability coefficients for LNNB factor scales. International Journal of Clinical Neuropsychology, 9, 132-135.

22.

Wiggins, J. S. (1966). Substantive dimensions of self-report in the MMPI item pool. Psychological Monographs, 80, (22, #630).

Maximized Reliability Estimates for Some Research Scales of The MMPI

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