Comitê de classificadores em bases de dados transacionais desbalanceadas com seleção de características baseada em padrões minerados

Abstract

The results of Classification Based on Associations Rules (CBA) are greatly influenced by the used data structure. A difficulty in this area is solving classification problems when it comes to unbalanced databases. Thus, this paper presents a study of unbalance in transactional and non-transactional databases, addressing the main methods used to solve the unbalance problem. In addition, with respect to the unbalance problem, this paper proposes a model to reach the balance between classes, conducting experiments with different methods of balancing and ensemble methods based on classifiers committee. These experiments were performed in transactional and non-transactional databases, in order to validate the proposed model and improve Classification Based on Associations Rules prediction. Another important factor in the classification process is database dimensionality, be cause when too large, it can compromise the classifiers performance. In this work, it is also proposed a feature selection model based on the rules of CBA. Aiming to validate this model, experiments were also performed applying different features selection methods in the databases.The classification results obtained using the bases containing the features selected by the methods were compared to validate the proposed model, these results were satisfactory in comparison with other methods of selection.