Two new formulas are offered for evaluating the abnormality of the difference between a subject's average score and one of the scores included in that average. The use of these formulas is illustrated with a portion of the standardization data for the McCarthy Scales of Children's Abilities. Users of the formulas are cautioned that a difference that is abnormal in the statistical sense need not imply pathology.
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References
1.
Davis, F. B.Interpretation of differences among averages and individual test scores. Journal of Educational Psychology, 1959, 50, 162-170.
2.
Kaufman, A. S.Note on interpreting profiles of McCarthy Scale Indexes. Perceptual and Motor Skills. 1975, 41, 262.
3.
Kaufman, A. S., & Kaufman, N. L.Clinical evaluation of young children with the McCarthy Scales. New York: Grune & Stratton, 1977.
4.
McCarthy, D.Manual for the McCarthy Scales of Children's Abilities. New York: Psychological Corporation, 1972.
5.
Naglieri, J. A.Interpreting the profile of McCarthy Scale Indexes. Psychology in the Schools, 1982, 19, 49-51.
6.
Payne, R. W., & Jones, H. G.Statistics for the investigation of individual cases. Journal of Clinical Psychology, 1957, 13, 115-121.
7.
Silverstein, A. B.Reliability and abnormality of test score differences. Journal of Clinical Psychology, 1981. 37, 392-394.
8.
Silverstein, A. B.Pattern analysis as simultaneous statistical inference. Journal of Consulting and Clinical Psychology, 1982, 50, 234-240.
