Exceptional Model Mining

Supervised descriptive local pattern mining with complex target concepts

Abstract

Finding subsets of a dataset that somehow deviate from the norm, i.e. where something interesting is going on, is a classical Data Mining task. In traditional local pattern mining methods, such deviations are measured in terms of a relatively high occurrence (frequent itemset mining), or an unusual distribution for one designated target attribute (common use of subgroup discovery). These, however, do not encompass all forms of “interesting”. To capture a more general notion of interestingness in subsets of a dataset, we develop Exceptional Model Mining (EMM). This is a supervised local pattern mining framework, where several target attributes are selected, and a model over these targets is chosen to be the target concept. Then, we strive to find subgroups: subsets of the dataset that can be described by a few conditions on single attributes. Such subgroups are deemed interesting when the model over the targets on the subgroup is substantially different from the model on the whole dataset. For instance, we can find subgroups where two target attributes have an unusual correlation, a classifier has a deviating predictive performance, or a Bayesian network fitted on several target attributes has an exceptional structure. We give an algorithmic solution for the EMM framework, and analyze its computational complexity. We also discuss some illustrative applications of EMM instances, including using the Bayesian network model to identify meteorological conditions under which food chains are displaced, and using a regression model to find the subset of households in the Chinese province of Hunan that do not follow the general economic law of demand.

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Notes

  1. 1.

    We consider the exact search strategy to be a parameter of the algorithm.

  2. 2.

    When the description language at hand is very expressive, and the dataset contains many numeric attributes, one can imagine that for every subset of the dataset at least one corresponding description exists.

  3. 3.

    http://cran.r-project.org.

  4. 4.

    Available from the Journal of Applied Econometrics Data Archive at http://econ.queensu.ca/jae/.

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Acknowledgments

This research is supported in part by the Deutsche Forschungsgemeinschaft (DFG) within the Collaborative Research Center SFB 876 “Providing Information by Resource-Constrained Analysis”, project C1, and in part by the Netherlands Organisation for Scientific Research (NWO) under project number 612.065.822 (Exceptional Model Mining).

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Correspondence to Wouter Duivesteijn.

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This paper extends the previously published papers (Leman et al. 2008; Duivesteijn et al. 2010, 2012a).

Responsible editor: M.J. Zaki.

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Duivesteijn, W., Feelders, A.J. & Knobbe, A. Exceptional Model Mining. Data Min Knowl Disc 30, 47–98 (2016). https://doi.org/10.1007/s10618-015-0403-4

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Keywords

  • Exceptional Model Mining
  • Subgroup Discovery
  • Supervised Local Pattern Mining
  • Regression
  • Bayesian Networks

Mathematics Subject Classification

  • H.2.8: Data mining