[Statlist] Séminaire de statistique jeudi 2 février 2012

[ISTAT Messagerie]

SEMINAIRE DE STATISTIQUE

Institut de Statistique, Université de Neuchâtel, Pierre-à-Mazel 7, 2000 Neuchâtel- http://www2.unine.ch/statistics   

JEUDI 24 NOVEMBRE 2011 à 11h00, salle PAM 101, 1er étage.

Valérie Chavez-Demoulin
Department of Operations, Faculty of Business and Economics, University of Lausanne


High-frequency Data Modeling using Hawkes Processes

We present a marked point process model for the excesses of a time series over a high threshold that combines Hawkes processes for the exceedances with generalized Pareto distribution for the marks (exceedance sizes). 
In a financial context, the conditional approach models intraday clustering of extremes of log-returns time series and is used to calculate instantaneous conditional Value-at-Risk. The form of the process allows realistic models in which recent events affect the current intensity more than more distant ones, but it also allows the intensity to depend on the sizes of the events. The models are backtested on real data. The talk is based on joint work with James McGill.