基于EGARCH模型的我国股市信息对称性研究

利用过去17年我国上证综合指数的历史数据,根据股票市场大的波动周期分五阶段经过EGARCH(1,1)模型估计,以验证市场对信息冲出的反映情况.研究结果表明:中国股市存在很大的波动性,尚未达到弱有效性;存在正负杠杆效应交替出现的现象,表现出信息不对称性,但是这种不对称性在明显减小.     

Bootstrap forecast intervals for asymmetric volatilities via EGARCH model

Bootstrap forecast intervals are developed for volatilities having asymmetric features, which are accounted for by fitting EGARCH models. A Monte-Carlo simulation compares the proposed forecast intervals with those based on GARCH fittings which ignore asymmetry. The comparison reveals substantial advantage of addressing asymmetry through EGARCH fitting over ignoring it as the conventional GARCH forecast. The EGARCH forecast intervals have empirical coverage probabilities closer to the nominal level and/or have shorter average lengths than the GARCH forecast intervals. The finding is also supported by real dataset analysis of Dow–Jones index and financial times stock exchange (FTSE) 100 index.     

沪深股市的非对称性分析——基于对1996-1997年和2005年-2007年两轮牛市的比较

本文运用非对称ARCH族模型对两轮牛市作了非对称性定量的比较分析,描述了沪深股市中"好消息"和"坏消息"在牛市下对股市波动性的影响,通过分析试图证明,中国股市已逐渐成熟,并针对结果提出了一些看法和建议,以期能对本轮牛市下的投资者和相关政策制定者有一定的启示。     

Dynamics of the term structure of interest rates and monetary policy: is monetary policy effective during zero interest rate policy?

The monetary policy targets the short rates; however, during zero interest rate policy (ZIRP), the short end of the yield curve cannot serve as a policy instrument. Relying on the joint yields-macro latent factors model, this study empirically examines the effect of monetary policy stances on term structure and the possible feedback effect on the real sector using the Japanese experience of ZIRP. The analysis indicates that it is the entire term structure that transmits the policy shocks to the real economy rather than the yield spread only. The monetary policy signals pass through the yield curve level and slope factors to stimulate the economic activity. The curvature factor, besides reflecting the cyclical fluctuations of the economy, acts as a leading indicator for future inflation. In addition, policy influence tends to be low as the short end becomes segmented toward medium/long-term of the yield curve. Furthermore, volatility in bond markets is found to be asymmetrically affected by positive and negative shocks and long end tends to be less sensitive to stochastic shocks than the short maturities. The expectation hypothesis of the term structure does not hold during the ZIRP period.     

中国黄金市场的风险价值研究

受美国次贷危机以及中国股市低进的影响，对于中国的投资者而言，黄金作为硬通货自然就成为一种很好的实现财富保值增值的投资工具。本文以基于广义误差分布的EGARCH（1，1）模型估计了中国黄金市场的日对数回报VaR值，通过后验测试与统计分析，得出以下结论：EGARCH（1，1）模型（1）能较好地拟合黄金价格的走势（2）杜宾-沃特森（D．W）统计量为1．994103极为接近2，这意味着回报序列的自相关很弱，因此均值方程可以不考虑自回归项。     

EGARCH Model with Weighted Liquidity

We analyze a variant of the EGARCH model which captures the variation of the intra-day price. We study the asymptotic behavior of the estimators for the parameters of the model. We also illustrate our theoretical results by empirical studies.     

深沪股指收益率波动研究

文章选取沪、深两市1991年1月1日至2005年2月18日的股票指数作为样本,运用EGARCH(1,1)模型,研究指数日收益率波动的性质特征,并探讨了不同阶段股市对利好消息和利空消息的反映。结果表明:不同阶段的指数收益率序列具有结构特征,各阶段沪、深两市指数收益率均与滞后一阶高度相关,且两市指数收益率均具有信息不对称效果。     

上海证券市场GARCH效应检验和模型选择

文章利用1999年10月8日至2003年11月7日上证综合指数每日的收盘价数据对其进行了GARCH效应的检验,结果表明上海证券市场股价的波动存在着显著的GARCH效应,并且存在非对称的情况。在具体的模型选择上以EGARCH(1,1)较好,并且在研究中发现GARCH-M模型不适合模拟我国上海证券市场股价的波动情况。     

中国期货市场价格波动非对称性效应的实证研究

采用EGARCH模型,以铜、大豆及小麦三个主要的连续期货合约收益序列为样本的实证研究表明:利空消息对我国期货价格波动的影响,要大于利多消息对期货价格波动的影响.对300个期货交易者的问卷调查结果也表明:我国期货投资者普遍存在的"过度恐惧"心理,是造成利空消息对期货价格波动的影响大于利多消息对期货价格波动的影响的最为重要的原因.     

市场信息对中国与欧盟猪肉价格波动的影响

市场信息是商品价格形成的基础。基于“信息经济学”理论,运用TARCH和EGARCH模型,探讨中国和欧盟猪肉市场信息对价格波动产生的不同影响。结果表明：中国猪肉市场存在明显的信息不对称效应,使猪肉价格上涨的 “正向信息”大于使猪肉价格下跌“负向信息”的影响,且“正向信息”对于猪肉价格的波动具有强化作用;欧盟猪肉市场“负向信息”大于“正向信息”的影响,且不存在显著的信息冲击不对称效应,其原因在于欧盟市场的政策干预少,价格“杠杆效应”不明显。因此,中国政府有关部门应减少干预,进一步提高猪肉市场的透明度。