Cluster The word means group. In statistics
we talk about Clustering or cluster analysis or cluster analysis, a set of multivariate data analysis techniques aimed at sorting and grouping of homogeneous elements in a data set.
From this it follows that the cluster is not nothing but a group of units toghether with each other by a character chosen as the discriminant for the formation of the group.
Ex
Consider a class of pupils, we form the group of children with hair blacks, the group of pupils with sneakers, etc. ..
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