435 research outputs found

    Empirical Research of Informed Trading DY-PIN Model Based on Hierarchical Clustering Method

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    知情交易的研究是金融市场微观理论的一个重要组成部分。在证券交易当中,知情交易体现为一种信息不对称行为,从风险管理角度上看,度量知情交易被看作是对信息风险的度量。在以往的文献中,学者通过构建符合市场交易特征的微观理论模型来从交易数据中挖掘和度量知情交易。信息风险度量的意义在于提供了观测金融市场风险的新信息,这些新信息有利于提前发现市场的整体风险状况和维护金融市场的合理运行,信息风险的度量同时为风险监管带来了新的要求,促进金融市场制度设计的完善。对于投资者来说,度量信息风险能够促进其合理规划自身的投资组合和分散信息风险、并做出理性的投资决策。 本文在文献综述中对以往文献中的知情交易模型进行了回顾...Informed trading is an important part of Micro Market ’s Theory .In security trading ’s activity ,informed trading commonly could be view as information asymmetry ,and in the risk management way ,measuring informed trading could be seen as measuring information risk .In the past related literature ,plenty of scholars measured informed trading probability from real data by constructing Micro ...学位:经济学硕士院系专业:经济学院_金融工程学号:1562013115210

    The Maximum Likelihood Estimation of Time-varying Coefficient Spatial Autoregression Panel Data Model

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    本文对扰动项存在跨时期的异方差、但不存在序列相关的时变系数空间自回归模型提出了极大似然的估计方法,并证明了该估计量的一致性,同时,证明了该估计量渐进服从正态分布,由此说明该估计量具有优良的大样本性质。同时,我们还对本文所提出估计量的小样本性质进行了数值模拟。本文研究表明,估计量虽然在N较小时偏差较大,但是随着N的不断增加,估计量偏差减小,体现了比较优良的渐进性质。同时,估计量的偏差会随着时期数的增加而变大,这说明本文所提出的估计方法适用于个体数较多、时期数较少的短面板数据。This paper researches the time-varying coefficient spatial autoregression panel data model,whose error has heteroscedasticity over time but without time serial correlation. This paper proposes a maximum likelihood estimation( MLE) for this model and proves the consistency and asymptotic normality of this MLE method,which testifies the favorite large sample properties of the MLE method. Meanwhile,we use Monte Carlo method to simulate the small properties of the MLE method,which shows that the estimator has large bias when N is small while the bias becomes smaller and smaller over the growth of N. Furthermore,we also find that the bias will increase over the growth of T,which shows that the MLE method is more suitable for the short panel data with small T and large N.国家自然科学基金青年项目“人口老龄化下的技术进步方向与要素收入份额”(71503220);; 教育部人文社会科学研究一般项目“空间似无关回归模型、参数估计、设定检验及其应用”(13YJC910003);; 福建省自然科学基金项目“基于样本数据内生的空间权重矩阵:理论与应用”(2014J01270)资

    Research on Improvement and Applications for Bayesian Fault Diagnosis

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    控制回路故障检测与诊断有助于保证生产过程的安全和高效、降低维护费用和减少停机时间。贝叶斯诊断是控制回路监测的概率化诊断框架,它能够综合多个监测器技术,以构建诊断系统进而作出最优决策。然而,工业过程控制回路诊断中存在许多不同的实际情况,严重制约了贝叶斯诊断的性能。本文重点从数据降维、似然估计等方面研究改进贝叶斯诊断性能的方法,提出了基于优化直方图估计的证据离散化方法、基于线性判别分析的特征提取与降维以及平均移动似然估计方法。通过仿真系统、工业基准数据和工业规模系统的仿真实验,验证了所提方法的有效性。论文主要包含以下几个方面的工作: (1) 综述了现有的贝叶斯诊断方法及其研究现状,系统介绍了控制...The purpose of control loop detection and diagnosis is to ensure the safety and efficacy of the production process, reduce maintenance costs and downtime. Bayesian diagnosis is a probabilistic diagnosis framework of control loop monitoring, which can combine multiple monitor technology to build a diagnosis system and make an optimal decision. However, there are many different situations in the con...学位:工程硕士院系专业:航空航天学院_工程硕士(控制工程)学号:2322013115337

    Parameter Estimation and Application of Generalized Pareto Mixtures via SCAD Penalty

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    本文主要研究混合双参数广义Pareto分布模型(下面简称混合广义Pareto模型)的概率密度估计。混合模型能够非常好地拟合现实数据。Pareto分布的特点是有厚尾特征,所以在金融风险度量方面受到越来越多的重视。与此同时,在保险、可靠性分析等方面应用十分普遍。实际运用中经常有需要用到多成分混合广义pareto模型的情况。 本文选取实际运用最广泛的一类广义pareto分布进行研究。在采取传统的矩估计和极大似然估计对混合分布进行参数估计时,发现它们确实在理论上很好实现,但是在实际计算中却特别繁琐。EM算法是常用的估计参数隐变量的利器,是一种迭代算法,经常被用来解决极大似然估计。它能够从非完整数...In this paper, we consider the estimation of a two parameters generalized Pareto mixture model(Hereinafter referred to as generalized Pareto mixture model) with density.The mixture model fits the real data very well. Due to the characteristics of thick tail, the Pareto distribution has been paid more and more attention in the field of financial risk measurement. At the same time, it has been wi...学位:理学硕士院系专业:数学科学学院_概率论与数理统计学号:1902014115261

    Study on High Accuracy Range and Motion Parameter Estimation for Frequency Modulation Coded Radar Systems

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    调频编码雷达为一种新型的高距离分辨率雷达,具有作用距离大、瞬时带宽低和抗干扰性能强等优点。针对调频编码雷达进行高精度测距测速算法的研究对于在该种雷达上完善和改进后续的目标成像、目标识别和目标跟踪等研究具有重要意义。因此,本文围绕调频编码雷达信号的距离和运动参数估计问题,开展了如下几个方面研究工作: (1) 深入研究调频编码雷达的回波信号模型,对实际雷达信号处理过程中的下变频、采样、匹配滤波和带通滤波等过程进行了模拟。最终得到调频编码雷达回波信号的离散形式数学模型。 (2) 为了得到高精度的测距测速结果,本文提出利用最大似然估计法(maximumlikelihoodestimation,ML...Frequency modulation coded radar is a new kind of high range resolution radar with advantages such as far range coverage, low instantaneous bandwidth and strong anti-jamming capability. Studying on high accuracy range and motion parameter estimation algorithm on frequency modulation coded radar is of great significance to improve and prefect the follow-up target imaging and target recognition and ...学位:工程硕士院系专业:信息科学与技术学院_工程硕士(电子与通信工程)学号:2332012115295

    Estimation in Partially Linear Spatial Lag Panel Model with Fixed Effects

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    本文构建了一类部分线性固定效应空间滞后面板模型,在此模型中,综合考虑了固定效应、参数自变量和非参数自变量的影响。基于截面拟极大似然估计方法对模型的参数部分和非参数部分进行了估计,并在个体数n和时期数T都很大的情况下,推导估计量的大样本表现。研究结果表明,在大样本条件下,估计量具有一致性,参数估计量满足渐近正态分布并且收敛速度为(nT)~(1/2)。We proposed a class of partially linear spatial lag panel model with fixed effects. The influence of fixed effect,parameter and nonparametric independent variables are considered synthetically in the model.The parametric and nonparametric parts of the model are estimated on the basis of the profile quasi-maximum likelihood estimation,and asymptotic properties for the estimators are deduced under the condition that the number of individuals and the number of periods are large. The results show that,under large sample conditions,the estimators are consistent and the parameter estimator satisfies the asymptotic normal distribution and the convergence rate is (nT)~(1/2).国家社会科学基金重大项目“资本存量核算的理论、方法研究与相关数据库建设”(15ZDB135)的阶段成

    随机效应广义空间滞后半参数变系数面板模型的估计

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    本文通过构建同时包含因变量和误差项空间滞后的随机效应半参数变系数面板模型,拓展了现有模型的灵活性和适应性;采用截面极大似然估计方法得出了参数和非参数的估计。理论证明发现:在一定的正则条件下,所有估计量具有一致性和渐近正态性。数值模拟显示:估计量具有良好的小样本性质,估计精度随着样本容量的增加而增加;空间权重矩阵的选择对估计量的表现没有产生显著差异,但是在Case权重矩阵下,当样本量相同时,空间相关系数的估计偏差随着空间权重结构复杂度的增加而扩大。教育部基地重大项目“矫正要素配置扭曲与促进经济有效增长”(16JJD790031)的阶段性成

    Estimation of Varying-Coefficient Spatial Auto-Regression Panel Model with Random Effects

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    具有良好可读性和稳健性的变系数模型在各学科领域应用广泛。本文构建了一种新的随机效应变系数空间自回归面板模型,运用截面极大似然估计方法,导出了模型的估计量,证明其具备一致性和渐近正态性,蒙特卡洛模拟研究显示估计量的小样本表现效果良好。Varying coefficient models with superior readability and robustness have been widely used in a variety of research fields. In this paper, it proposes the new varying coefficient spatial autoregrcssive panel model with random effects. By the profile maximum likelihood estimators are constructed, it gets the consistency and asymptotical normality of these estimators. The Monte Carlo simulation shows that the estimators have good performances under finite samples.本文为国家社会科学基金项目“半参数变系数空间自回归模型的理论及应用研究”(16BTJ018)、教育部人文社会科学重点研究基地重大项目“集聚经济下的中国地方政府财税行为研究”(15JJD790029)、教育部人文社会科学项目“空间自回归单指数模型的理论和实践”(13YJA9100002)和福建省自然科学基金项目“几类新的变系数空间白回归模型的估计和应用研究”(2017J01396)的阶段性成果

    Partially Linear Spatial Lag Panel Model with Fixed Effects

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    传统的计量经济学,忽略了地理空间邻近引起的数据空间相依性和空间异质性,可能导致模型估计方法和检验结果的失效或偏差。预先设定参数形式的空间计量模型具有较为强烈的主观性,对一些具体的计量问题,不足以充分刻画被解释变量和解释变量之间的潜在关系。因此本文试图构建一类半参数空间滞后面板模型,并对其估计量性质进行必要的理论推导和数值模拟验证。 Yu,Jong&Lee(2008)研究了固定效应空间动态面板数据模型的拟极大似然估计量的大样本性质,Su&Jin(2010)研究了一类部分线性空间自回归模型的截面拟极大似然估计量。在此基础上,本文构建了一类部分线性固定效应空间滞后面板模型,在此模型中,综合考虑了固...Traditional econometrics ignore the spatial dependency and spatial heterogeneity caused by the geospatial proximity, which may lead to the failure or deviation of the methods and test results. However, the parametric spatial measurement models with pre-set parameters have a strong subjectivity. For some specific measurement problems, they are not enough to fully describe the potential relationship...学位:经济学硕士院系专业:经济学院_统计学学号:1542014115199

    The estimation of term structure in Chinese interbank Treasury bond market based on Bayesian method and Nelson-Siegel model

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    本文基于Nelson-Siegel模型参数的最大似然估计方法,提出了Nelson-Siegel模型参数的贝叶斯估计方法,并且对参数不同先验分布进行了研究,推导出了不同先验分布对应的参数抽样方法。本文使用2014年至2016年间我国银行间市场国债交易数据,对银行间市场国债即期收益率曲线进行了Nelson-Siegel模型估计,包括传统的最大似然估计和本文提出的贝叶斯估计,并且利用所估计的国债即期收益率曲线对债券进行了定价,比较其与中央国债登记结算公司所公布的国债即期收益率曲线的定价效率。根据我们的分析,在样本区间内,相较于中央国债登记结算公司所公布的国债即期收益率曲线,Nelson-Siegel...Based on the outcome of maximum likelihood estimation, we propose a Bayesian estimation method for Nelson-Siegel model. We also deduce the corresponding sampling method for each parameter in the model under different prior densities. We estimate the term structure of Chinese interbank Treasury bonds between the year 2014 and 2016. With respect to the pricing efficiency of Treasury bonds, we find t...学位:经济学硕士院系专业:王亚南经济研究院_金融学学号:2772014115274
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