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Extracting the multi-timescale activity patterns of online financial markets

Teruyoshi Kobayashi, Anna Sapienzai and Emilio Ferrara
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Anna Sapienzai: University of Southern California, Information Sciences Institute, Los Angeles
Emilio Ferrara: University of Southern California, Information Sciences Institute, Los Angeles

No 1809, Discussion Papers from Graduate School of Economics, Kobe University

Abstract: Online financial markets can be represented as complex systems where trading dynamics can be captured and characterized at different resolutions and time scales. In this work, we develop a methodology based on non-negative tensor factorization (NTF) aimed at extracting and revealing the multi-timescale trading dynamics governing online financial systems. We demonstrate the advantage of our strategy first using synthetic data, and then on real-world data capturing all interbank transactions (over a million) occurred in an Italian online financial market (e-MID) between 2001 and 2015. Our results demonstrate how NTF can uncover hidden activity patterns that characterize groups of banks exhibiting different trading strategies (normal vs. early vs. flash trading, etc.). We further illustrate how our methodology can reveal "crisis modalities" in trading triggered by endogenous and exogenous system shocks: as an example, we reveal and characterize trading anomalies in the midst of the 2008 financial crisis.

Date: 2018-02
New Economics Papers: this item is included in nep-mst
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