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- W3125206564 abstract "We introduce a model-independent approximation for the branching ratio of Hawkes self-exciting point processes. Our estimator requires knowing only the mean and variance of the event count in a sufficiently large time window, statistics that are readily obtained from empirical data. The method we propose greatly simplifies the estimation of the Hawkes branching ratio, recently proposed as a proxy for market endogeneity and formerly estimated using numerical likelihood maximisation. We employ our new method to support recent theoretical and experimental results indicating that the best fitting Hawkes model to describe S&P futures price changes is in fact critical (now and in the recent past) in light of the long memory of financial market activity." @default.
- W3125206564 created "2021-02-01" @default.
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- W3125206564 date "2014-10-01" @default.
- W3125206564 modified "2023-09-27" @default.
- W3125206564 title "Branching ratio approximation for the self-exciting Hawkes process" @default.
- W3125206564 hasPublicationYear "2014" @default.
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