Abstract
In the WISC manual Wechsler (1949) gives correlation matrices for his battery of 12 cognitive tests for three random samples of normal children aged 7½, 10½ and 13½ years respectively. A factor analysis of each of these matrices, excluding the information and mazes tests which are seldom used in Britain, is reported elsewhere (Maxwell, 1959), and it is shown that the pattern of loadings is similar for all three age groups. The question then arose as to how the pattern of loadings for a sample of children attending a psychiatric clinic would compare with that obtained for normal children. The problem is investigated in this article.
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