Abstract
There is considerable empirical evidence suggesting that the random walk model for changes in stock prices is not appropriate. One of the reasons is that this model fails to account for economic cycles because increments are independent and identically distributed. A reliable solution for modeling economic cycles consists in modulating the parameters of a basis process, e.g., a Brownian motion by a hidden Markov chain. This approach has received a lot of attention in the recent econometric literature. In this chapter, we aim to introduce its main features in continuous time. The first sections focus on regime switching diffusions with transition jumps. We present their properties and an estimation procedure to fit this process to stock log-returns. Pricing of options is also discussed. We next introduce the switching multifractal model of Calvet and Fisher (J Econom 105:17–58, 2001). This is a switching diffusion with a large number of regimes that are structured in order to limit the number of parameters. This chapter partly serves as introduction to Chap. 2 in which a multivariate extension is estimated by a Monte Carlo Markov Chain method.
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Notes
- 1.
As \(\tau _{x}^{+}\) and \(\tau _{x}^{-}\) are stopping times, this is a consequence of the strong Markov property of γ t.
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Hainaut, D. (2022). Switching Models: Properties and Estimation. In: Continuous Time Processes for Finance. Bocconi & Springer Series, vol 12. Springer, Cham. https://doi.org/10.1007/978-3-031-06361-9_1
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DOI: https://doi.org/10.1007/978-3-031-06361-9_1
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