Cluster Analysis
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Abstract
Cluster analysis is a generic term for a large collection of techniques designed to investigate multivariate data to determine whether the data consist of relatively distinct groups of similar 'individuals' (using individuals as a general term for the variety of entities that may be the subject of the analysis). In medicine, for example, discovering that a large set of patients can be partitioned into a small number of groups or clusters, within which the patients have very similar characteristics may have important implications both for treatment of the disease and for understanding its etiology.