For the column proportions and column means tests, by default columns are tested in groups that are determined by the structure of the table. For example, in a table with three categories in the column variable, columns would be labeled A, B, and C, and the test would be carried out on all combinations of columns A-C. In nested tables, the columns of the inner nest level are repeated (and given unique IDs), and the test is carried out for each set of columns within the nesting level.