Comparison of the effect of unsupervised and supervised discretization methods on classification process

  • Mohammed H. IBRAHIM
Keywords: Discretization, Supervised and Unsupervised Discretization, Continuous Features, Discrete Feature


Most of the machine learning and data mining algorithms use discrete data for the classification process. But, most data in practice include continuous features. Therefore, a discretization pre-processing step is applied on these datasets before the classification. Discretization process converts continuous values to discrete values. In the literature, there are many methods used for discretization process. These methods are grouped as supervised and unsupervised methods according to whether a class information is used or not. In this paper, we used two unsupervised methods: Equal Width Interval (EW), Equal Frequency (EF) and one supervised method: Entropy Based (EB) discretization. In the experiments, a well-known 10 dataset from UCI (Machine Learning Repository) is used in order to compare the effect of the discretization methods on the classification. The results show that, Naive Bayes (NB), C4.5 and ID3 classification algorithms obtain higher accuracy with EB discretization method.


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Han, J., Pei, J., & Kamber, M. (2011). Data mining: concepts and techniques. Elsevier.

Dougherty, J., Kohavi, R., & Sahami, M. (1995, July). Supervised and unsupervised discretization of continuous features. In Machine learning: proceedings of the twelfth international conference (Vol. 12, pp. 194-202).

Hacibeyoglu, M., Arslan, A., & Kahramanli, S. (2011). Improving Classification Accuracy with Discretization on Data Sets Including Continuous Valued Features. Ionosphere, 34(351), 2.

Gupta, A., Mehrotra, K. G., & Mohan, C. (2010). A clustering-based discretization for supervised learning. Statistics & probability letters, 80(9), 816-824.

Joiţa, D. (2010). Unsupervised static discretization methods in data mining. Titu Maiorescu University, Bucharest, Romania.

Gama, J., & Pinto, C. (2006, April). Discretization from data streams: applications to histograms and data mining. In Proceedings of the 2006 ACM symposium on Applied computing (pp. 662-667). ACM.

Jiang, S. Y., Li, X., Zheng, Q., & Wang, L. X. (2009, May). Approximate equal frequency discretization method. In 2009 WRI Global Congress on Intelligent Systems (Vol. 3, pp. 514-518). IEEE.

Agre, G., & Peev, S. (2002). On supervised and unsupervised discretization. Cybernetics and information technologies, 2(2), 43-57.

Wu, X., Kumar, V., Quinlan, J. R., Ghosh, J., Yang, Q., Motoda, H., ... & Zhou, Z. H. (2008). Top 10 algorithms in data mining. Knowledge and information systems, 14(1), 1-37.

HSSINA, B., Merbouha, A., Ezzikouri, H., & Erritali, M. (2014). A comparative study of decision tree ID3 and C4. 5. Int. J. Adv. Comput. Sci. Appl, 4(2).

How to Cite
M. HACIBEYOĞLU and M. IBRAHIM, “Comparison of the effect of unsupervised and supervised discretization methods on classification process”, IJISAE, pp. 105-108, Dec. 2016.
Research Article