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Clustering Categorical And Numerical Data: A New Procedure Using Multidimensional Scaling

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  • SUNG-GI LEE

    (Department of Industrial Engineering, Hanyang University, Seoul, South Korea;
    Department of Industrial Engineering, Hanyang University, 17 Haengdang-Dong, Sungdong-Ku, Seoul, 133-791, South Korea)

  • DEOK-KYUN YUN

    (Department of Industrial Engineering, Hanyang University, Seoul, South Korea;
    Department of Industrial Engineering, Hanyang University, 17 Haengdang-Dong, Sungdong-Ku, Seoul, 133-791, South Korea)

Abstract

In this paper, we present a concept based on the similarity of categorical attribute values considering implicit relationships and propose a new and effective clustering procedure for mixed data. Our procedure obtains similarities between categorical values from careful analysis and maps the values in each categorical attribute into points in two-dimensional coordinate space using multidimensional scaling. These mapped values make it possible to interpret the relationships between attribute values and to directly apply categorical attributes to clustering algorithms using a Euclidean distance. After trivial modifications, our procedure for clustering mixed data uses thek-means algorithm, well known for its efficiency in clustering large data sets. We use the familiarsoybean diseaseandadultdata sets to demonstrate the performance of our clustering procedure. The satisfactory results that we have obtained demonstrate the effectiveness of our algorithm in discovering structure in data.

Suggested Citation

  • Sung-Gi Lee & Deok-Kyun Yun, 2003. "Clustering Categorical And Numerical Data: A New Procedure Using Multidimensional Scaling," International Journal of Information Technology & Decision Making (IJITDM), World Scientific Publishing Co. Pte. Ltd., vol. 2(01), pages 135-159.
    • Handle: RePEc:wsi:ijitdm:v:02:y:2003:i:01:n:s0219622003000549
    DOI: 10.1142/S0219622003000549
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