Thanks a lot for your answer. I already know how to handle relevance   
   factor. The (nontrivial) question is how/where from could I obtain:   
      
   a. data sets with relevance associated to individual inputs or subsets   
   b. assign relevance for "normal" data sets (normal = without relevance   
   value)   
      
   Regards,   
   Lucian.   
      
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