In our example, the features are things such as the amount of saturated fat and
the amount of cholesterol. The features are extracted by reading the nutritional
information printed on the packaging or by performing laboratory tests. There
are various ways to combine the evidence in order to quantify the “healthiness”
(denotedH) of the food, but one simple way is to weight the importance of each
feature and then add the weighted feature values together, such as