To define a base element on a col statement, type:

If the keyword base is given by itself, the base element will be labeled ‘Base’.

base creates a base row or column with the text Base, the text being printed exactly as it appears on the col statement. To have a base with a different text, follow the keyword base with an equals sign and the desired text. For example:

prints a base row with the text ‘All Using Brand A’.

Tables can also be weighted in which case any base created with base or base= will also be weighted. For information on weighting, see Weighting.