Abstract
A set of actual scores on the MMPI are compared with a set of SD-generated scores. However, the SD-generated scores are not obtained in the usual way, viz., from the mean SD score of Ss. Instead, the SD score of each S is taken separately and an MMPI profile is generated for him. 15 MMPI scales are examined. The differences between the actual means and the means of the SD-generated scores are evaluated using the t test and the Pearson product-moment correlation. The results show that for 14 of the 15 scales the differences between the means are significant (p ≤ .01), and that 11 of the 15 correlations are significantly different from zero. However, the correlations account for only a relatively small portion of the variance. Only in the case of 4 scales does the correlation account for as much as 45 to 65% of the variance. The authors recommend, on the basis of the data and a logical analysis, that the SD-generated scores not be used as a substitute for the actual scores on the MMPI.
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