A semi-Markov model for price returns

Guglielmo D'Amico and Filippo Petroni ()

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Abstract: We study the high frequency price dynamics of traded stocks by a model of returns using a semi-Markov approach. More precisely we assume that the intraday return are described by a discrete time homogeneous semi-Markov process and the overnight returns are modeled by a Markov chain. Based on this assumptions we derived the equations for the first passage time distribution and the volatility autocorreletion function. Theoretical results have been compared with empirical findings from real data. In particular we analyzed high frequency data from the Italian stock market from first of January 2007 until end of December 2010. The semi-Markov hypothesis is also tested through a nonparametric test of hypothesis.

Date: 2011-03
New Economics Papers: this item is included in nep-mst
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Published in Physica A, 391, 4867-4876, 2012

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