On Scale Correction in Personality Measurement

Abstract

Thumin (1969) has suggested that K-correction of MMPI scales will affect correlations among these scales. Analysis of MMPI data for 793 males showed that K-correction reduced correlations among the scales and that this resulted from a predictable reduction in variances. Comparison of the results of this study with correlations reported by Dahlstrom and Welsh (1960) indicate that the effect of K-correction on the intercorrelations among MMPI scales is small compared with that resulting from a change in population. The effect of AT-correction need concern only the researcher, not the practitioner, and then only when the characteristics of the sample have been compared with those of defined populations.

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