XPost: comp.ai, comp.ai.neural-nets, comp.databases   
   XPost: sci.math   
   From: kheor_@hotmail.com   
      
   SOM networks allow you to detect this kind of Outlier on a Map. In   
   fact, we use Som in fraud detection really often.   
      
   Hope that helps.   
   Ps: read unsupervised learning on FAQ   
      
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