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Related phrases:   non-hierarchical clustering

Definitions of hierarchical clustering:

• A method which emphasizes how adjacent spatial units with high or low disease rates might cluster by ranking the units by disease rate and then examining how probable cluster adjacencies would be compared to random conditions and marking off successive clusters wherever low probability values occur.
  www.sph.umich.edu/geomed/htmls/glossary/gloss.html
• Data clustering is a common technique for statistical data analysis, which is used in many fields, including machine learning, data mining, pattern recognition, image analysis and bioinformatics. Clustering is the classification of similar objects into different groups, or more precisely, the partitioning of a data set into subsets (clusters), so that the data in each subset (ideally) share some common trait - often proximity according to some defined distance measure.
  en.wikipedia.org/wiki/Hierarchical_clustering

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