The Picture Identification Test (PIT) was administered to 50 male prisoners and 50 male vocational school students. PIT profiles of Ss were compared by computing the absolute differences between pairs of Ss for each of the 67 PIT scores and then summing the differences (Sum D score). The hypothesis that similarities in PIT profiles would occur more frequently between members of the same group was supported by the results (p < .01). A significant number (p < .01) of 44 new prisoners and 44 new students were correctly classified as prisoner or student on the basis of similarities to averaged cluster profiles extracted from the original groups.
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