From: eq2dephased@gmail.com   
      
   Hello everyone,   
      
   I have a dataset of observations (about 100 000 observations). Each   
   observation gives me the state of  30 discrete variables at a given   
   time.   
      
   I would like to know if there exists any "distance" that could tell me   
   "how far" an observation is from another? I am not trying to get the   
   distance between two variables but rather between two "vectors" which   
   are made of the observations of 30 different variables at a given time.   
      
   I read up a bit on the subject but I must admit I am confused with all   
   the possible measures and what they achieve: chi square, euclidean,   
   mahalanobis...   
      
      
   Thanks in advance for the help you may give me !   
      
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