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Calculates Sums of Squares and Cross Products (SSCP) from the selected TableOfReal.
The sums of squares and cross products sij between the elements of columns i and j are calculated as:
| sij = Σk (xki - x̄i)(xkj - x̄j), |
where xmn is the element m in column n, and x̄n is the mean of column n.
© djmw 19990218