In the previous chapters we came across the zero-order, or simple, correlation coefficients r12, r13, r23, and the partial, or first-order, correlations r123, r13.2, r231, and their interrelationships. In the k-variable case, we shall have in all k(k — 1)/2 zero-order correlation coefficients. (Why?) These k(k — 1)/2 correlations can be put into a matrix, called the correlation matrix R as follows:
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