Processes | Expression Parameters | Rescale the data based on the total measurements in the Training data set

Rescale the data based on the total measurements in the Training data set
Check this box to rescale the data based on the sum totals of the measurements for each column in the selected training data set . The scaling factors are standardized so that, in original scale, they multiply to one (1).
Note: This parameter is available only if the Select Training subset based on Missing status box is checked.