4.4 Complementary Items

If you enable the complement items option, complementary items are also taken into account. e.g., for the item \((coffee)\), the complement would be \((NOT coffee)\). In this case, apart from the association \((milk, coffee) \to (sugar)\), complementary rules such as \((milk, NOT coffee) \to (chocolate)\) may also be detected. BigML represents complementary items with an exclamation point \((coffee \to !coffee)\). (See Figure 4.5 .)