SSCP matrix function
SSCP(A) Sums of squares and cross-products. Returns a square matrix having as many rows (and columns) as the argument has columns. The diagonal values are sums of squares and the off-diagonal values are sums of cross products. SSCP(A) equals A′A (for A′ see TRANS function above).
Matrix Algebra Useful for Statistics
Shayle R. Searle, Andre I. Khuri
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