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arXiv 0709.0440q-fin.STmath.STstat.TH
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波动率估计器相对于建模假设是否稳健?

Are volatility estimators robust with respect to modeling assumptions?

Yingying Li, Per A. Mykland

摘要:

我们认为微观结构是潜在证券价格的任意污染,通过马尔可夫核$Q$。特殊情况包括加性误差、舍入及其组合。我们的主要结果是,平滑条件下,两个尺度已实现波动率率是强大的污染形式$Q$。为了推动我们的结果的极限,我们展示了一些涉及舍入的模型(当然,这不是平滑的)会发生什么,并看到在这种情况下,鲁棒性如何随着平滑度的降低而恶化。我们的结论是,在合理的平滑,人们不需要考虑太密切的微观结构是如何形成的,而如果严重的非平滑怀疑,人们需要注意的精确结构,以及使用的波动率估计将投入。

英文摘要:

We consider microstructure as an arbitrary contamination of the underlying latent securities price, through a Markov kernel $Q$. Special cases include additive error, rounding and combinations thereof. Our main result is that, subject to smoothness conditions, the two scales realized volatility is robust to the form of contamination $Q$. To push the limits of our result, we show what happens for some models that involve rounding (which is not, of course, smooth) and see in this situation how the robustness deteriorates with decreasing smoothness. Our conclusion is that under reasonable smoothness, one does not need to consider too closely how the microstructure is formed, while if severe non-smoothness is suspected, one needs to pay attention to the precise structure and also the use to which the estimator of volatility will be put.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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