From: ted.dunning@gmail.com   
      
   Dmitry A. Kazakov wrote:   
   > On Mon, 17 Jul 2006 01:45:32 GMT, Dephased wrote:   
   >   
   > > I have a dataset of observations (about 100 000 observations). Each   
   > > observation gives me the state of  30 discrete variables at a given   
   > > time.   
   > > ...   
   > This is the central issue of machine learning.   
   >   
   > ...   
   >   
   > Unfortunately there is no one distance for all possible spaces. Just   
   > consider that some observations in fact depend on others.   
      
   Consider also the case where you add noise features.  An optimal   
   distance would not depend on these features since they would only   
   degrade the coherency of your distance metric.   
      
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