On covariance estimation of non-synchronously observed diffusion processes
On covariance estimation of non-synchronously observed diffusion processes
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DOI:
10.3150/bj/1116340299
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发表时间:
2005-04-01
期刊:
影响因子:
1.5
通讯作者:
Yoshida, N
中科院分区:
文献类型:
--
作者:
Hayashi, T;Yoshida, N
We consider the problem of estimating the covariance of two diffusion processes when they are observed only at discrete times in a non-synchronous manner. The modern, popular approach in the literature, the realized covariance estimator, which is based on (regularly spaced) synchronous data, is problematic because the choice of regular interval size and data interpolation scheme may lead to unreliable estimation. We propose a new estimator which is free of any 'synchronization' processing of the original data, hence free of bias or other problems caused by it.