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Because of the important role that humans have in KDD, visualization is a data mining method in itself in addition to being essential in reporting the results, or ``creating'' the knowledge [4]. The illustrations can be used to gain insight of the data set and to summarize data sets. The power of the SOM as a visualization method is that only a single glance is needed to get an idea of the structure of the whole data set.

Juha Vesanto
Tue May 27 12:40:37 EET DST 1997