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A dichotomy is a partition of a whole (or a set) into two parts (subsets) that are: * jointly exhaustive: everything must belong to one part or the other, and * mutually exclusive: nothing can belong simultaneously to both parts. Such a partition is also frequently called a bipartition. The two parts thus formed are complements. In logic, the partitions are opposites if there exists a proposition such that it holds over one and not the other. Treating continuous variables or multicategorical variables as binary variables is called dichotomization. The discretization error inherent in dichotomization is temporarily ignored for modeling purposes. == Etymology == The term ''dichotomy'' is from the Greek language διχοτομία ''dichotomía'' "dividing in two" from δίχα ''dícha'' "in two, asunder" and τομή ''tomḗ'' "a cutting, incision". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「dichotomy」の詳細全文を読む スポンサード リンク
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