| Abstract: | Raw scores for the clinical scales of the MMPI can be changed to T scores by linear transformation. However, if the underlying distributions of raw scores are not distributed normally, one cannot assume that the traditional point of significance, T score 70, falls at the 97.7 percentile. Our analysis of the improved Minnesota normal sample described by Hathaway and Briggs in 1957 revealed statistically significant degrees of skewness on most of the clinical scales. We suggest that clinicians consider more conservative interpretation for scales 1 (Hs), 2 (D), 7 (PT), 8 (SC), and 9 (MA) for females and for scales 1 (Hs), 2 (D), 4 (PD), 7 (PT), 8 (SC), and 9 (MA) for males. |
