Mining several databases with an ensemble of classifiers

The results of knowledge discovery in databases could vary depending on the data mining method. There are several ways to select the most appropriate data mining method dynamically. One proposed method clusters the whole domain area into "competence areas" of the methods. A metamethod is then used to decide which data mining method should be used with each data base instance. However, when knowledge is extracted from several databases knowledge discovery map produce conflicting results even if the separate data bases are consistent. At least two types of conflicts may arise. The first type is created by data inconsistency within the area of the intersection of the databases. The second type of conflicts is created when the metamethod selects different data mining methods with inconsistent competence maps for the objects of the intersected part. We analyze these two types of conflicts and their combinations and suggest ways to handle them.