Limit theorems for nearly unstable Hawkes processes: Version with technical appendix

Abstract : Because of their tractability and their natural interpretations in term of market quantities, Hawkes processes are nowadays widely used in high frequency finance. However, in practice, the statistical estimation results seem to show that very often, only "nearly unstable Hawkes processes" are able to fit the data properly. By nearly unstable, we mean that the L1 norm of their kernel is close to unity. We study in this work such processes for which the stability condition is almost violated. Our main result states that after suitable rescaling, they asymptotically behave like integrated Cox Ingersoll Ross models. Thus, modeling financial order flows as nearly unstable Hawkes processes may be a good way to reproduce both their high and low frequency stylized facts. We then extend this result to the Hawkes based price model introduced by Bacry et al. We show that under a similar criticality condition, this process converges to a Heston model. Again, we recover well known stylized facts of prices, both at the microstructure level and at the macroscopic scale.
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Pré-publication, Document de travail
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Contributeur : Mathieu Rosenbaum <>
Soumis le : mercredi 22 janvier 2014 - 23:31:31
Dernière modification le : mercredi 23 janvier 2019 - 10:29:24
Document(s) archivé(s) le : jeudi 24 avril 2014 - 11:41:12


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  • HAL Id : hal-00935038, version 1


Thibault Jaisson, Mathieu Rosenbaum. Limit theorems for nearly unstable Hawkes processes: Version with technical appendix. 2014. 〈hal-00935038〉



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