Keep in mind that in many situations we do in fact have to make a binary decision between two alternatives. Often it reduces to a go/no-go decision. In that case this heuristic of reducing multi-valued vectors to a single scalar weighting factor is a necessary step.
Keep in mind that in many situations we do in fact have to make a binary decision between two alternatives. Often it reduces to a go/no-go decision. In that case this heuristic of reducing multi-valued vectors to a single scalar weighting factor is a necessary step.