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, February 18, 1999