Abstract
The quasi-likelihood estimator and the Bayesian type estimator of the volatility parameter are in general asymptotically mixed normal. In case the limit is normal, the asymptotic expansion was derived in Yoshida 1997 as an application of the martingale expansion. The expansion for the asymptotically mixed normal distribution is then indispensable to develop the higher-order approximation and inference for the volatility. The classical approaches in limit theorems, where the limit is a process with independent increments or a simple mixture, do not work. We present asymptotic expansion of a martingale with asymptotically mixed normal distribution. The expansion formula is expressed by the adjoint of a random symbol with coefficients described by the Malliavin calculus, differently from the standard invariance principle. Applications to a quadratic form of a diffusion process (“realized volatility”) is discussed.
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Notes
- 1.
The order of the central limit theorem is referred to as the first order in asymptotic decision theory, differently from the numbering of terms in asymptotic expansion.
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Acknowledgements
This work was in part supported by Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research No. 24340015 (Scientific Research), Nos. 24650148 and 26540011 (Challenging Exploratory Research); CREST Japan Science and Technology Agency; and by a Cooperative Research Program of the Institute of Statistical Mathematics.
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Yoshida, N. (2016). Asymptotic Expansions for Stochastic Processes. In: Denker, M., Waymire, E. (eds) Rabi N. Bhattacharya. Contemporary Mathematicians. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-30190-7_2
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