Long-time fluctuations in a dynamical model of stock market indices
- 9 July 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review E
- Vol. 64 (2), 026101
- https://doi.org/10.1103/physreve.64.026101
Abstract
Financial time series typically exhibit strong fluctuations that cannot be described by a Gaussian distribution. Recent empirical studies of stock market indices examined whether the distribution of returns after some time can be described by a (truncated) Lévy-stable distribution with some index While the Lévy distribution cannot be expressed in a closed form, one can identify its parameters by testing the dependence of the central peak height on as well as the power-law decay of the tails. In an earlier study [R. N. Mantegna and H. E. Stanley, Nature (London) 46 (1995)] it was found that the behavior of the central peak of for the Standard & Poor 500 index is consistent with the Lévy distribution with In a more recent study [P. Gopikrishnan et al., Phys. Rev. E 5305 (1999)] it was found that the tails of exhibit a power-law decay, with an exponent thus deviating from the Lévy distribution. In this paper we study the distribution of returns in a generic model that describes the dynamics of stock market indices. For the distributions generated by this model, we observe that the scaling of the central peak is consistent with a Lévy distribution while the tails exhibit a power-law distribution with an exponent namely, beyond the range of Lévy-stable distributions. Our results are in agreement with both empirical studies and reconcile the apparent disagreement between their results.
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