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Applications of a Novel Clustering Approach Using Non-Negative Matrix Factorization to Environmental Research in Public Health

Author

Listed:
  • Paul Fogel

    (Independent Consultant, Paris 75006, France)

  • Yann Gaston-Mathé

    (YGM Consult, CEO, Paris 75015, France)

  • Douglas Hawkins

    (School of Statistics, University of Minnesota, Minneapolis, MN 55455, USA)

  • Fajwel Fogel

    (Institute Louis Bachelier, Paris 75002, France)

  • George Luta

    (Department of Biostatistics, Bioinformatics, and Biomathematics, Georgetown University, Washington, DC 20057, USA)

  • S. Stanley Young

    (CGStat, CEO, Raleigh, NC 27607, USA)

Abstract

Often data can be represented as a matrix, e.g., observations as rows and variables as columns, or as a doubly classified contingency table. Researchers may be interested in clustering the observations, the variables, or both. If the data is non-negative, then Non-negative Matrix Factorization (NMF) can be used to perform the clustering. By its nature, NMF-based clustering is focused on the large values. If the data is normalized by subtracting the row/column means, it becomes of mixed signs and the original NMF cannot be used. Our idea is to split and then concatenate the positive and negative parts of the matrix, after taking the absolute value of the negative elements. NMF applied to the concatenated data, which we call PosNegNMF, offers the advantages of the original NMF approach, while giving equal weight to large and small values. We use two public health datasets to illustrate the new method and compare it with alternative clustering methods, such as K-means and clustering methods based on the Singular Value Decomposition (SVD) or Principal Component Analysis (PCA). With the exception of situations where a reasonably accurate factorization can be achieved using the first SVD component, we recommend that the epidemiologists and environmental scientists use the new method to obtain clusters with improved quality and interpretability.

Suggested Citation

  • Paul Fogel & Yann Gaston-Mathé & Douglas Hawkins & Fajwel Fogel & George Luta & S. Stanley Young, 2016. "Applications of a Novel Clustering Approach Using Non-Negative Matrix Factorization to Environmental Research in Public Health," IJERPH, MDPI, vol. 13(5), pages 1-14, May.
  • Handle: RePEc:gam:jijerp:v:13:y:2016:i:5:p:509-:d:70287
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    References listed on IDEAS

    as
    1. Karthik Devarajan, 2008. "Nonnegative Matrix Factorization: An Analytical and Interpretive Tool in Computational Biology," PLOS Computational Biology, Public Library of Science, vol. 4(7), pages 1-12, July.
    2. Daniel D. Lee & H. Sebastian Seung, 1999. "Learning the parts of objects by non-negative matrix factorization," Nature, Nature, vol. 401(6755), pages 788-791, October.
    3. Hawkins, Douglas M., 2001. "Fitting multiple change-point models to data," Computational Statistics & Data Analysis, Elsevier, vol. 37(3), pages 323-341, September.
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    Cited by:

    1. Paul Fogel & Christophe Geissler & Nicolas Morizet & George Luta, 2023. "On Rank Selection in Non-Negative Matrix Factorization Using Concordance," Mathematics, MDPI, vol. 11(22), pages 1-18, November.

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    Keywords

    SVD; PCA; NMF; K-means;
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