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AI 根据所提供的论文材料归类:摘要明确研究含微观结构噪声的高频金融价格及大维度积分波动率矩阵。

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关注这篇论文的作者
Yazhen Wang
Jian Zou

高频金融数据的大维度波动率矩阵估计

研究问题
高频价格含微观结构噪声且资产数量与观测量同时增长时,如何可靠估计大维度积分波动率矩阵?
方法与思路
作者在含微观结构噪声的扩散过程框架下提出新的积分波动率矩阵估计量,并在资产维数与样本量共同增长时分析性质。
材料陈述的贡献
摘要称,新估计量在积分波动率矩阵稀疏条件下具有较快收敛率,数值研究及真实高频数据应用显示良好表现。
阅读关注点
应核对矩阵稀疏性的定义、噪声及观测机制的限制、维数增长范围,以及收敛率采用的范数和比较基准。
阅读边界
材料为版本未注明的 OpenAlex 索引摘要;未说明具体估计步骤、收敛率或数值收益,既有方法失效的论断有待核对条件。

原文摘要

High-frequency data observed on the prices of financial assets are commonly modeled by diffusion processes with micro-structure noise, and realized volatility-based methods are often used to estimate integrated volatility. For problems involving a large number of assets, the estimation objects we face are volatility matrices of large size. The existing volatility estimators work well for a small number of assets but perform poorly when the number of assets is very large. In fact, they are inconsistent when both the number, p, of the assets and the average sample size, n, of the price data on the p assets go to infinity. This paper proposes a new type of estimators for the integrated volatility matrix and establishes asymptotic theory for the proposed estimators in the framework that allows both n and p to approach to infinity. The theory shows that the proposed estimators achieve high convergence rates under a sparsity assumption on the integrated volatility matrix. The numerical studies demonstrate that the proposed estimators perform well for large p and complex price and volatility models. The proposed method is applied to real high-frequency financial data.

笔记与分组