
Standardizes each column of the selected TableOfReal.
The entries x_{ij} in the TableOfReal will change to:
(x_{ij} – μ_{j}) / σ_{j}, 
where μ_{j} and σ_{j} are the mean and the standard deviation as calculated from the j^{th} column, respectively. After standardization all column means will equal zero and all column standard deviations will equal one.
Standard deviations are calculated with the corrected twopass algorithm as described in Chan, Golub & LeVeque (1983).
© djmw, April 28, 1999