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Cluster analysis is a multivariate statistical technique used to classify objects, items, or data points into relatively homogeneous groups called clusters, such that members of the same cluster are more similar to each other than to those in other clusters. In the context of informetrics and scientometrics, cluster analysis is extensively used to identify thematic structures, classify research articles, authors, journals, or institutions, and to uncover hidden patterns in bibliometric data. Cluster analysis is an unsupervised learning method, meaning it does not rely on predefined class labels. Instead, it examines the intrinsic structure of data and assigns observations _______ ______ _______ ______ _______ __________ ________.
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