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S ummary . Prior to revising Advanced Matrices (1947) an Item Analysis was carried out on a sample of cases drawn from a parent population of over 2,000. The method of analysis is described, and the reasons for the retention and rejection of items given. The findings are discussed in the light of those of Yates (1961). It is concluded that the new edition, Progressive Matrices (1962), although shorter will be at least as efficient as the 1947 version.
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Alan R. Forbes (1964) studied this question.
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