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Cluster analysis is a statistical technique used to generate a category structure.The groups which are formed should have a high degree of association between members of hte same group and a low degree between members of different groups.

Similarity Measures: 

               2C
 S         = -------
  (Di,dj)     A + B 

   Where C is the number of terms that Di and Dj have in common, 
   and A and B are the number of termsin Di and Dj

Similarity Matrix

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