These options are in fact specific examples of selected area factoring where the area in question is either a complete row or column. A complete set of row or column-specific factors needs to be defined. These may be either set interactively by screen editing or they may be taken to be the row/column totals from an input matrix (the most common example of the latter being to multiply rows in a matrix of probabilities by origin totals or columns of probabilities by destination totals; see 10.19.1).
If the matrix is stacked, e.g., for multiple user classes, then the screen edit format sub-divides the data displayed on the screen by level (if all levels are being edited together). Alternatively it is possible to set row/origin factors for Level 1 and then apply the same factors to all levels or to set factors and apply them to rows for a single level only. The latter options are new in release 10.8 while the former correct potential pre-10.8 errors.
Finally options were added in 10.9.23 to apply column factoring to a single selected level from a stacked matrix.
At the moment there are no options to read in factors from an external .dat file although this can be done with only slight inconvenience using selected area factoring (10.7.3). For example a control file:
1 1 0 0 1.50
2 2 0 0 1.75
0 0 1 1 1.20
1 1 0 0 1.50
would factor row 1 by 1.50, row 2 by 1.75, column 1 by 1.20, etc.