Abstract
Simple parametric models of the marginal distribution of stock returns are an essential building block in many areas of applied finance. Even though it is well known that the normal distribution fails to represent most of the “stylised” facts characterising return distributions, it still dominates much of the applied work in finance. Using monthly S&P 500 stock index returns (1871–2005) as well as daily returns (2001–2005), we investigate the viability of three alternative parametric families to represent both the stylised and empirical facts: the generalised hyperbolic distribution, the generalised logF distribution, and finite mixtures of Gaussians. For monthly return data, all three alternatives give reasonable fits for all sub-periods. However, the generalised hyperbolic distribution fails to describe some features of the marginal distributions in some sub-periods. The daily return data are much more symmetric and expose another problem for all three distributions: the parameters describing the behaviour of the tails also influence the scale so that simpler alternatives or restricted parameterisations are called for.
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Behr, A., Pötter, U. Alternatives to the normal model of stock returns: Gaussian mixture, generalised logF and generalised hyperbolic models. Ann Finance 5, 49–68 (2009). https://doi.org/10.1007/s10436-007-0089-8
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DOI: https://doi.org/10.1007/s10436-007-0089-8
Keywords
- Stock returns
- Non-normality
- Gaussian mixtures
- Generalised hyperbolic distribution
- Generalised logF distribution