DM: Classification problem

My problem has to do with the data set. I have two classes (the good guys
and the bad guys) unfortunatelly the bad guys are only 20 when the good guys
are 99980. Anybody who knows how to deal with it?
Thanks in advance.
     Yannis

• References:
  • RE: DM: RE: Data Forms for Mining (Limit on variables)
    • From: Helberg, Clay

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