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Graph-Based Entropy for Detecting Explanatory Signs of Changes in Market

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  • Yukio Ohsawa

    (The University of Tokyo)

Abstract

Graph-based entropy, an index of the diversity of events in their distribution to parts of a co-occurrence graph, is proposed for detecting signs of structural changes in the data that are informative in explaining latent dynamics of consumers’ behavior. For obtaining graph-based entropy, connected sub-graphs are first obtained from the graph of co-occurrences of items in the data. Then, the distribution of items occurring in events in the data to these sub-graphs is reflected on the value of graph-based entropy. For the data on the position of sale, a change in this value is regarded as a sign of the appearance, the separation, the disappearance, or the uniting of consumers’ interests. These phenomena are regarded as the signs of dynamic changes in consumers’ behavior that may be the effects of external events and information. Experiments show that graph-based entropy outperforms baseline methods that can be used for change detection, in explaining substantial changes and their signs in consumers’ preference of items in supermarket stores.

Suggested Citation

  • Yukio Ohsawa, 2018. "Graph-Based Entropy for Detecting Explanatory Signs of Changes in Market," The Review of Socionetwork Strategies, Springer, vol. 12(2), pages 183-203, December.
    • Handle: RePEc:spr:trosos:v:12:y:2018:i:2:d:10.1007_s12626-018-0023-8
    DOI: 10.1007/s12626-018-0023-8
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    References listed on IDEAS

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    1. Paul Fearnhead & Zhen Liu, 2007. "On‐line inference for multiple changepoint problems," Journal of the Royal Statistical Society Series B, Royal Statistical Society, vol. 69(4), pages 589-605, September.
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    Cited by:

    1. Makoto Naraoka & Teruaki Hayashi & Takaaki Yoshino & Toshiaki Sugie & Kota Takano & Yukio Ohsawa, 2020. "Detecting and explaining changes in various assets' relationships in financial markets," Papers 2005.10603, arXiv.org, revised Nov 2020.
    2. Yi Sun & Teruaki Hayashi & Yukio Ohsawa, 2021. "A Latent Topic Analysis and Visualization Framework for Category-Level Target Promotion in the Supermarket," The Review of Socionetwork Strategies, Springer, vol. 15(2), pages 429-453, November.

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