From: stefan.mandl@informatik.uni-erlangen.de   
      
   > Unfortunately there is no one distance for all possible spaces. Just   
   > consider that some observations in fact depend on others.   
      
   I'd suggest using Principal Component Analysis (if your features are   
   numbers) to get rid of some dependencies and reduce the number of   
   dimensions in your data.   
      
   regards,   
      
   Stefan   
      
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