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
Yoshida, N
中科院分区:
数学2区
文献类型:
--
作者:
Hayashi, T;Yoshida, N

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本文考虑了两个扩散过程的协方差估计问题,当它们只在离散时间以非同步的方式被观测时。现代流行的方法在文献中,实现的协方差估计,这是基于(定期间隔)同步数据,是有问题的,因为定期间隔大小和数据插值方案的选择可能会导致不可靠的估计。我们提出了一个新的估计,这是免费的任何“同步”处理的原始数据,因此没有偏见或其他问题所造成的。
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.