Abstract.
A detailed analysis of correlation between stock returns at high frequency is compared with simple models of random walks. We focus in particular on the dependence of correlations on time scales – the so-called Epps effect. This provides a characterization of stochastic models of stock price returns which is appropriate at very high frequency.
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Mastromatteo, I., Marsili, M. & Zoi, P. Financial correlations at ultra-high frequency: theoretical models and empirical estimation. Eur. Phys. J. B 80, 243–253 (2011). https://doi.org/10.1140/epjb/e2011-10865-y
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DOI: https://doi.org/10.1140/epjb/e2011-10865-y