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CDS Pricing with Fractional Hawkes Processes

Author

Listed:
  • Ketelbuters, John John

    (Université catholique de Louvain, LIDAM/ISBA, Belgium)

  • Hainaut, Donatien

    (Université catholique de Louvain, LIDAM/ISBA, Belgium)

Abstract

We propose a fractional self-exciting model for the risk of corporate default. We study the properties of a time-changed version of an intensity based model. As a time-change, we use the inverse of an α-stable subordinator. Performing such a time-change allows to incorporate two particular features in the survival probability curves implied by the model. Firstly, it introduces random periods of time where the survival probability is frozen, thereby modeling periods of time where the viability of the company is not threatened. Secondly, the time-change implies possible sharp drops in the survival probability. This feature corresponds to the occurence of one-time events that threaten the creditworthiness of the company. We show that the joint probability density function and Laplace transform of the time-changed intensity and associate compensator are solutions of fractional Fokker-Planck equations. After a discussion regarding approximation of Caputo fractional derivatives, we describe a simple and fast numerical method to solve the Fokker-Planck equation of the Laplace transform. This Laplace transform is used to obtain the survival probabilities implied by our model. Finally, we use our results to calibrate the model to real market data and show that it leads to an improvement of the fit.

Suggested Citation

  • Ketelbuters, John John & Hainaut, Donatien, 2022. "CDS Pricing with Fractional Hawkes Processes," LIDAM Reprints ISBA 2022002, Université catholique de Louvain, Institute of Statistics, Biostatistics and Actuarial Sciences (ISBA).
    • Handle: RePEc:aiz:louvar:2022002
    DOI: https://doi.org/10.1016/j.ejor.2021.06.045
    Note: In: European Journal of Operational Research, 2022, vol. 297(3), p. 1139-1150
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    Cited by:

    1. Habyarimana, Cassien & Aduda, Jane A. & Scalas, Enrico & Chen, Jing & Hawkes, Alan G. & Polito, Federico, 2023. "A fractional Hawkes process II: Further characterization of the process," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 615(C).
    2. Kyungsub Lee, 2023. "Multi-kernel property in high-frequency price dynamics under Hawkes model," Papers 2302.11822, arXiv.org.
    3. Yfanti, Stavroula & Karanasos, Menelaos & Zopounidis, Constantin & Christopoulos, Apostolos, 2023. "Corporate credit risk counter-cyclical interdependence: A systematic analysis of cross-border and cross-sector correlation dynamics," European Journal of Operational Research, Elsevier, vol. 304(2), pages 813-831.

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