Sub-range

Magnum Opus must be instructed how to divide the values of a numeric attribute into sub-ranges.

Either the user can select cut-points that determine the sub-ranges, or can allow Magnum Opus to select them.

If the user selects the cut-points, in the names file the attribute name is followed by a list of sub-range cut points. Each cut point is introduced by one of the relations < or <= which is followed by the value that terminates the sub-range. If the relation is <, the sub-range includes all values less than the specified value. If the relation is <=, the sub-range includes all values less than or equal to the specified value.

Example:

Spend < 10 <= 100

This specifies that the attribute spend has three sub-ranges:

Spend < 10

10 <= Spend <= 100

Spend > 100

Note that there is always one more sub-range than the number of cut points that are specified.

If Magnum Opus is to select the cut-points, in the names file the attribute name is followed by the keyword numeric and then the number of sub-ranges to be created.

Example:

Spend: numeric 5

For compatibility with See-5, Magnum Opus also accepts the keyword continuous which is treated as numeric 3.