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基于卡尔曼类滤波方法的利率期限结构模型估计研究
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摘要
利率期限结构的理论和模型是金融研究中最具挑战性的课题之一,也是目前金融工程领域的一项十分重要的基础性研究工作。而利率期限结构的模型估计又是利率理论研究和实证工作的基础和关键环节。卡尔曼类滤波估计理论是经典最优滤波理论的组成部分,由于其实时、快速、精确以及稳定和易操作等性质和特点而广泛应用于信号处理、通讯和控制等领域,取得了很好的效果。本论文的目的就在于通过回顾利率期限结构模型和卡尔曼类滤波估计理论和方法的发展历程,系统的将卡尔曼类滤波估计理论和方法引入到利率期限结构的模型估计上来,为利率期限结构模型理论和实证研究提供模型估计方法和应用基础。
     本论文首先将利率期限结构模型划分为均衡模型和无套利模型两大类,分别具体介绍了两大类模型中具体模型理论的提出、构建以及模型特点。接着,系统介绍了卡尔曼类滤波估计理论和方法,包括卡尔曼滤波估计(Kalman Filter)、扩展卡尔曼滤波估计(Extended Kalman Filter)、无损卡尔曼滤波估计(Unscented Kalman Filter)的理论和方法,以及在利率期限结构模型估计上的具体应用。
     最后,本论文在Matlab 7.0环境下实现了扩展卡尔曼滤波估计(EKF,下同)和无损卡尔曼滤波估计(UKF)对Vasicek模型的参数估计,并通过对两种滤波方法的运算速度、估计效果等方面进行对比,探讨了EKF和UKF的特点、适用范围以及性能优劣。
     本论文的研究内容受国家自然科学基金项目“固定收益证券利率风险动态定价与对冲方法研究”(项目编号:70471051)资助,是其部分研究成果。
The theories and models on term structure of interest rates are one of the most challenging works in finance research and an important fundamental branch in financial engineering field. And the model estimation of term structure of interest rates is the foundation and key link for the theoretical and empirical research on interest rates. The family of Kalman filters is part of the classical theory of optimal filtering. They have got advantages such as real time corresponding, speed computing, precise estimating, steady running and easy operating, which makes them widely used in various fields such as signal processing, communication, control and so on. In light of the excellent estimation effects these filters have obtained in the fields above, this dissertation, by reviewing the evolving process of both theories on modeling term structure of interest rates and algorithms of the family of Kalman filters, pursues a systemic application of the family of Kalman filters to the model estimation of term structure of interest rates, which supplies an estimation method and application foundation for the theoretical and empirical research on modeling the term structure of interest rates.
     The dissertation firstly divided the models into two families: equilibrium models and no-arbitrage models and makes a detailed discussion on models in each family about their origin, construction and model characters. Then, the dissertation systematically introduce the theories and algorithms of the family of Kalman filters, including Kalman filter (KF), extended Kalman filter (EKF) and unscented Kalman filter (UKF), as well as their applications to the model estimation of the term structure of interest rates.
     Finally, the dissertation carries out parameter estimation of Vasicek model, in Matlab 7.0, using EKF and UKF respectively. And then a discussion is given on the two filters in the aspects of characters, applicability scopes and superiority, by contrasting their estimation results in estimation effects, computing speed and so on.
     As one of its research achievements, the dissertation is financed by the National Natural Science Fund project‘Research on Approach to Dynamically Pricing and Hedging of Interest Rate Risk of Fixed Income Securities’(No. 70471051).
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