Eigenfunction martingale estimating functions and filtered data for drift estimation of discretely observed multiscale diffusions.

Eigenfunction martingale estimating functions and filtered data for drift estimation of discretely observed multiscale diffusions.
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DOI:
10.1007/s11222-022-10081-7
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发表时间:
2022
影响因子:
2.2
通讯作者:
--
中科院分区:
数学2区
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We propose a novel method for drift estimation of multiscale diffusion processes when a sequence of discrete observations is given. For the Langevin dynamics in a two-scale potential, our approach relies on the eigenvalues and the eigenfunctions of the homogenized dynamics. Our first estimator is derived from a martingale estimating function of the generator of the homogenized diffusion process. However, the unbiasedness of the estimator depends on the rate with which the observations are sampled. We therefore introduce a second estimator which relies also on filtering the data, and we prove that it is asymptotically unbiased independently of the sampling rate. A series of numerical experiments illustrate the reliability and efficiency of our different estimators.
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