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A pattern consists of fundaments and relations. Its similarity to other patterns can be expressed either in terms of relations alone—in which case a modified correlation coefficient, r s , suffices—or in terms of fundaments and relations, where new coefficients, r p and r′ p are required. The derivation of a coefficient of pattern similarity, r p , is presented and its properties are investigated, both deductively and in terms of actual data on culture patterns.
Raymond B. Cattell (Thu,) studied this question.