带有市场交易信息和随机微观噪声下的杠杆效应研究

在风险管理中杠杆效应的现象广泛存在，也是金融计量学中的重要议题。高频金融市场中蕴含着丰富的交易信息，而这些信息并不能都看作随机噪声，因此探讨利用市场交易信息并在带有随机噪声模型下研究杠杆效应具有重要意义。本文在带有市场交易信息和随机微观噪声相结合的模型下研究了杠杆效应，提出了新的杠杆效应估计，该估计具有n^1/8的收敛速度，同时给出了估计的方差和相关的定理。通过模拟分析得出利用广泛的市场微观信息可以更有效和更精确地对杠杆效应进行估计，模拟的结果表明本文提出的杠杆效应估计具有更好的渐近正态性和更小的偏差。最后将提出的估计应用到实证分析中，发现杠杆效应对未来一天波动率的预测具有显著性影响。     

Predicting the Daily Covariance Matrix for S&P 100 Stocks Using Intraday Data—But Which Frequency to Use?

This article investigates the merits of high-frequency intraday data when forming mean-variance efficient stock portfolios with daily rebalancing from the individual constituents of the S&P 100 index. We focus on the issue of determining the optimal sampling frequency as judged by the performance of these portfolios. The optimal sampling frequency ranges between 30 and 65 minutes, considerably lower than the popular five-minute frequency, which typically is motivated by the aim of striking a balance between the variance and bias in covariance matrix estimates due to market microstructure effects such as non-synchronous trading and bid-ask bounce. Bias-correction procedures, based on combining low-frequency and high-frequency covariance matrix estimates and on the addition of leads and lags do not substantially affect the optimal sampling frequency or the portfolio performance. Our findings are also robust to the presence of transaction costs and to the portfolio rebalancing frequency.     

Bayesian Dynamic Factor Models and Portfolio Allocation

We discuss the development of dynamic factor models for multivariate financial time series, and the incorporation of stochastic volatility components for latent factor processes. Bayesian inference and computation is developed and explored in a study of the dynamic factor structure of daily spot exchange rates for a selection of international currencies. The models are direct generalizations of univariate stochastic volatility models and represent specific varieties of models recently discussed in the growing multivariate stochastic volatility literature. We discuss model fitting based on retrospective data and sequential analysis for forward filtering and short-term forecasting. Analyses are compared with results from the much simpler method of dynamic variance-matrix discounting that, for over a decade, has been a standard approach in applied financial econometrics. We study these models in analysis, forecasting, and sequential portfolio allocation for a selected set of international exchange-rate-return time series. Our goals are to understand a range of modeling questions arising in using these factor models and to explore empirical performance in portfolio construction relative to discount approaches. We report on our experiences and conclude with comments about the practical utility of structured factor models and on future potential model extensions.     

中国硬麦期货价格的波动性实证研究

针对期货合约数据处理的困难，论文提出一种新的合约连续数据处理方法，对2002年1月～2 004年8月中国硬麦期货数据进行处理，并采用TARCH模型，按照距离到期日时间的不同对价 格波动性进行研究。结果表明，不同交易时段的硬麦期货价格波动存在差异,进一步表明成 交量是价格波动和引起差异的主要原因     

On regression-based tests for persistence in logarithmic volatility models

Building on the work of Pantula (1986), this paper discusses how the hypothesis of conditional variance nonstationarity in the logarithmic family of generalized autoregressive conditional heteroskedasticity (GARCH) and stochastic volatility processes may be tested using regression-based tests. The latter are easy to implement, have well-defined large-sample distributions, and are less sensitive to structural changes than tests based on the quasimaximum likelihood estimator.     

中国期货市场流动性与波动性关系的实证研究

根据混合分布假设理论(MDH)等前人研究成果,及对中国期货市场三个主要期货交易品种铜、铝和天然胶期货的日流动性和日波动性的实证研究,可以发现:交易量与波动率有显著的正相关关系,持仓量与波动率有显著的负相关关系;而流动性比率与波动性却并没有显著的关系。     

Between dollarization and exchange rate volatility: Nigeria's portfolio diversification option

This paper investigates the relationship between nominal exchange rate volatility and dollarization in Nigeria by applying Granger causality test for the period 1986 (1)–2003 (4). Previous theoretical and empirical studies on this issue provided conflicting results. The empirical results of Granger causality test support a bi-directional relationship. However, causality from dollarization to exchange rate volatility appears stronger and dominates. This suggests that policies that aim to reduce exchange rate volatility in Nigeria must include measures that specifically address the issue of dollarization. An important factor in this case is the supply of sufficient domestic currency assets that would permit portfolio diversification and capable of dousing negative expectations about future inflation in the country.     

在心理和谐中实现诗意安居

诗意安居非简单“占有一住处”,而是指向精神层面的栖居与安宁,以生活的和谐与精神的自由为旨趣,它是构建和谐社会的意蕴所在。心理和谐是一种内洽外融、积极乐观的心理态势,它是达至诗意安居的心理基础和内在条件,人在心理和谐中才能实现诗意安居。     

"已实现"波动率理论研究与评价

"已实现"波动率是一种全新的金融波动率测量方法。"已实现"波动率在理论上没有测量误差的无偏估计量,在实证建模方面比其他模型更易于估计参数,同时最优频率的选取对于"已实现"波动率的测量精确度是很重要的。     

基于截面数据的区域内产业集中度与出口波动关系研究——以德州市为例

借助于面板数据模型中的固定效应变截距模型以及出口历史波动率对德州市出口型企业区域内产业集中度和企业规模以及名义汇率与出口之间的关系加以验证,实证结果显示,出口波动与名义汇率变动(主要是美元相对人民币贬值)负相关,出口波动与"区域内产业集中度"正相关,表现为低集中度的产业出口波动更小,在高集中度的行业,出口波动更大。同时,在行业内部,出口规模大的企业出口波动更小,而出口规模小的企业则出口波动更大,调查结果显示这些小企业较大企业议价能力更弱,受到的汇率冲击也更大一些。