StandardizeNumCellColumns

Declaration:

TDataTable.StandardizeNumCellColumns (var Means, StdDevs: TDoubleArray);

The method StandardizeNumCellColumns standardizes the data columns of the numeric cells (cells which are neither marked as csNAN, nor as csUndefined and which belong to either interval or ratio scaled variables) of the data table. This means that the numeric elements of the data matrix are transformed in a way that each column of the matrix has a zero mean and a unit standard deviation. The means and the standard deviations of all columns are returned in the parameters Means and StdDevs. Columns which contain nominal or ordinal values are left unchanged. The lengths of the Means and StdDevs arrays are automatically adjusted to the number of columns of the matrix.