[Forum SIS] UNIBO Statistics Seminars

[Silvia Cagnone]

We are glad to announce the following Statistics Seminar:


Tuesday, January 29, 2.30 pm

Room IV, via delle Belle Arti 41, Bologna


              Leopoldo Catania  (Aarhus University)


Dynamic Discrete Mixtures and High-Frequency Prices


Abstract:

High frequency price changes of financial assets are usually assumed to follow a distribution with continuous support and time-varying parameters. However, the tick structure of the financial markets entails that price changes observed at very high frequency are discrete. We start from this empirical evidence to develop a new model able to describe the dynamic properties of a multivariate time-series of high frequency price changes, including the high probability of observing no variations (zeroes). We assume the existence of two independent latent processes  determining the dynamic properties of the price changes and the probability of the occurrence of zeroes. Given the probabilistic structure embedded in our modelling framework we analyze the different sources of this large amount of zeroes as for example: absence of news, same magnitude of positive and negative news, and periods of market illiquidity. Furthermore, we propose a multivariate model to investigate the dynamics of the zeroes across several assets.



Contact person: Alessandra Luati


The schedule of the statistics seminars are available at http://www.stat.unibo.it/it/dipartimento/seminari-di-statistica-2019


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