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Another precaution needs to be noted in the context of fraud-detection with
supervised methods. In most cases only a small percentage of fraud is identified
and used for supervising a method. The result is that the method will only identify
fraud which is similar to the already known fraud. To investigate other fraud-schemas
we need to use unsupervised methods for finding general patterns which then can be
tested for fraudulent behavior using external knowledge and/ or investigations.
Thomas Prang
1998-06-07