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A hierarchical organization of terms or ideas that allows aggregation into categories that can be counted and compared without double counting. A statistical classification is monohierarchical which means that each node in the hierarchy is part of one node is the level above. This avoids double counting but means that arbitrary decisions must be made where a node is naturally related to more than one parent. For example, in a statistical classification such as ICD-10 , 'bacterial pneumonia' is be related to 'lung disorder' or 'infection disorder' but not to both.