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Early warning signals of financial crises using persistent homology

Author

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  • Ismail, Mohd Sabri
  • Noorani, Mohd Salmi Md
  • Ismail, Munira
  • Razak, Fatimah Abdul
  • Alias, Mohd Almie

Abstract

This study examines persistent homology to detect early warning signals of financial crises in the United States, Singapore, and Malaysia markets. Persistent homology is applied to obtain a L1-norm time series, which is then associated with critical slowing down indicators (autocorrelation function at lag 1, variance, and mean power spectrum at low frequencies). Mann–Kendall test is used to anticipate the rising trend in the indicators before financial crises. Significance, structural break, and sensitivity tests are added to validate the method’s robustness. Further, we compare the L1-norms with another representative called residual time series. In our findings, three methods, namely mean power spectrums at low frequencies of the L1-norms, variances of the residuals and mean power spectrums at low frequencies of the residuals consistently provide a period of significant rising trends and breakpoints before the Dotcom crash and Lehman Brothers bankruptcy in all markets. The outcome indicates their potential as an early warning detection tool. However, these methods depend on their parameters. Despite the dependency, we further analyze these methods by determining the threshold to cover entire trading days and record their performance based on two classification scores (probability of successful anticipation and probability of erroneous anticipation). Overall, the mean power spectrums at low frequencies of the residuals is the finest method to detect early warning signals of financial crises in all markets. It is closely followed by the mean power spectrums at low frequencies of the L1-norms, which has obtained better scores than the variances of the residuals in the US and Singapore, except for Malaysia. Besides the residuals, our study demonstrates that the L1-norms obtained from persistent homology also is a meaningful representation to detect early warning signals. In general, this study offers a framework to determine early warning signals of financial crises for risk management purposes.

Suggested Citation

  • Ismail, Mohd Sabri & Noorani, Mohd Salmi Md & Ismail, Munira & Razak, Fatimah Abdul & Alias, Mohd Almie, 2022. "Early warning signals of financial crises using persistent homology," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 586(C).
    • Handle: RePEc:eee:phsmap:v:586:y:2022:i:c:s0378437121007329
    DOI: 10.1016/j.physa.2021.126459
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