Outlier Detection with a Hybrid Artificial Intelligence Method

  • Authors:
  • Manuel Mejía-Lavalle;Ricardo Gómez Obregón;Atlántida Sánchez Vivar

  • Affiliations:
  • Instituto de Investigaciones Eléctricas, Morelos, México 62490;Comisión Federal de Electricidad, México, México;Instituto de Investigaciones Eléctricas, Morelos, México 62490

  • Venue:
  • MICAI '09 Proceedings of the 8th Mexican International Conference on Artificial Intelligence
  • Year:
  • 2009

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Abstract

We propose a simple and efficient hybrid artificial intelligence method to detect exceptional data. The proposed method includes a novel end-user explanation feature. After various attempts, the best design was based on an unsupervised learning schema, which uses an hybrid adaptation of the Artificial Neural Network paradigms, the Case Based Reasoning methodology, the Data Mining area, and the Expert System shells. In our method, the cluster that contains the smaller number of instances is considered as outlier data. The method provides an explanation to the end user about why this cluster is exceptional regarding to the data universe. The proposed method has been tested and compared successfully not only with well-known academic data, but also with a real and very large financial database that contains attributes with numerical and categorical values.