we employ cluster analysis to derive the clusters representing different dimensions of the profile of the respondets on the set of variables. in this sense, each cluster is a unique representation of the population. 

in sampling, we discuss cluster sampling also.  in cluster sampling, cluster is understood as the unit of population and we can select some clusters randomly or otherwise. 

I think the meaning of cluster in cluster sampling and cluster analysis seems to be paradoxical. 

please clarify my doubt. 

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