Do Investors Expect Mean Reversion in Asset Prices?

We investigate the existence and source of equilibrium mean reversion in UK non-financial and financial asset prices over the period 6 April, 1981, through 31 October, 1995. Our results indicate substantial expected transitory components in commodity and metals markets but report expected mean reversion for financial assets only at the near to maturity horizons. Implied cash flow yields appear to have a role in driving the mean reverting process particularly at short horizons while the role of interest rate movements varied across assets and across maturities. Our results reject the existence of a common risk premium across market term structures.     

Estimation of copula-based semiparametric time series models

This paper studies the estimation of a class of copula-based semiparametric stationary Markov models. These models are characterized by nonparametric marginal distributions and parametric copula functions, while the copulas capture all the scale-free temporal dependence of the processes. Simple estimators of the marginal distribution and the copula parameter are provided, and their asymptotic properties are established under easily verifiable conditions. These results are used to obtain root-n consistent and asymptotically normal estimators of important features of the transition distribution such as the (nonlinear) conditional moments and conditional quantiles. The semiparametric conditional quantile estimators are automatically monotonic across quantiles, which is attractive for portfolio conditional value-at-risk calculations.     

Separating Technical Change from Time-Varying Technical Inefficiency in the Absence of Distributional Assumptions

This paper proposes an alternative model for separating technical change from time-varying technical inefficiency. The proposed formulation uses the general index, developed by Baltagi and Griffin (1988), to model technical change in the production frontier function and a quadratic function of time, as in Cornwell, Schmidt and Sickles (1990), to capture the temporal pattern of technical inefficiency. In such a setting, all parameters associated with the rate of technical change and the temporal pattern of technical inefficiency are identified separately. Moreover, the proposed formulation is independent of any distributional assumption concerning the one-sided error term associated with technical inefficiency, and it can be estimated in a single stage with non-linear FGLS. Empirical results based on a translog production frontier, and estimates of technical inefficiency and technical change are presented for the UK dairy sector over the period 1982–1992.     

Nonparametric inference on multivariate versions of Blomqvist’s beta and related measures of tail dependence

We consider nonparametric estimation of multivariate versions of Blomqvist’s beta, also known as the medial correlation coefficient. For a two-dimensional population, the sample version of Blomqvist’s beta describes the proportion of data which fall into the first or third quadrant of a two-way contingency table with cutting points being the sample medians. Asymptotic normality and strong consistency of the estimators are established by means of the empirical copula process, imposing weak conditions on the copula. Though the asymptotic variance takes a complicated form, we are able to derive explicit formulas for large families of copulas. For the copulas of elliptically contoured distributions we obtain a variance stabilizing transformation which is similar to Fisher’s z-transformation. This allows for an explicit construction of asymptotic confidence bands used for hypothesis testing and eases the analysis of asymptotic efficiency. The computational complexity of estimating Blomqvist’s beta corresponds to the sample size n, which is lower than the complexity of most competing dependence measures.      

基于Copula函数的秩相关和尾相关研究

变量间的相关结构是考察变量联合分布特征的首要任务。最经典的是线性相关系数,然而由于线性相关系数是建立在正态分布假设基础上的,存在着很多的局限性,所以,引入了用Copula函数表示的秩相关和尾相关测度。用Copula函数表示的秩相关和尾相关测度比较稳健,不易受极端值影响,且不需要正态分布假设。最后通过模拟得到了上市公司t-Cop-ula的秩相关和尾相关测度。     

The Value Premium and Time-Varying Volatility

Abstract:  Numerous studies have documented the failure of the static and conditional capital asset pricing models to explain the difference in returns between value and growth stocks. This paper examines the post-1963 value premium by employing a model that captures the time-varying total risk of the value-minus-growth portfolios. Our results show that the time-series of value premia is strongly and positively correlated with its volatility. This conclusion is robust to the criterion used to sort stocks into value and growth portfolios and to the country under review (the US and the UK). Our paper is consistent with evidence on the possible role of idiosyncratic risk in explaining equity returns, and also with a separate strand of literature concerning the relative lack of reversibility of value firms' investment decisions.     

Do Newly Listed Derivatives Affect the Market Risk Premium in a Thin Stock Market?

This study examines the effects on the stock market unitary risk premium and volatility associated with the listing of stock and stock index derivatives in Switzerland. Based on a univariate GARCH (1,1) specification of the stock index variance and a time-varying unitary risk premium representation, we can reject the hypothesis that stock and stock index derivatives listings do not affect the total risk premium. Contrarily to previous empirical evidence, we find that derivatives listings affect both the conditional market returns' variance and the unitary risk premium through structural shocks. The gradual market completion hypothesis is further corroborated in that, cumulatively, the three stock and stock index options futures derivatives listings reduced the unitary risk premium while the marginal impact of each successive listing decayed.     

非参数Bernstein Copula理论及其相关性研究

本文介绍了一种非参数Copula即Bemstein Copula.通过Bemstein Copula可以对任何多元分布函数进行逼近.推导出了该类Copula的非线性测度:Sppearman's rho.并对3种copula的Spearman'srho进行了拟合.     

理论劳动收入份额测度及分解——基于时变弹性生产函数模型

劳动收入份额是理解国民收入分配格局的关键。本文基于时变弹性生产函数模型估计得到理论劳动收入份额,并将实际劳动收入份额分解为为理论劳动收入份额和市场扭曲两个因素。定义劳动收入份额实际值和理论值的差值为市场扭曲。实证研究发现,理论劳动收入份额显示与实际劳动收入份额一致的趋势,是劳动收入份额长期趋势的决定因素;市场扭曲显示与实际劳动收入份额一致的波动,是劳动收入份额短期波动的主要原因;实际劳动工资偏离劳动边际产出,是市场价格扭曲的根本体现。本文研究为正确理解中国劳动收入份额时变性提供新的参考。     

Does self-fulfilment of the inflation expectation exist?

This study examines the causal relationship between the actual and expected inflation in the U.S., using the bootstrap Granger full-sample causality test and sub-sample rolling-window estimation test to illustrate the self-fulfilment of inflation expectations. The full-sample result indicates that there is a bidirectional causality between the actual and expected inflation, showing the possibility of self-fulfilment of inflation expectations which illustrates that inflation is driven by inflation expectation. However, considering structural changes in two series, we find that the short-run causal nexus between the actual and expected inflation using full-sample data are fraudulent. By adopting a time-varying rolling-window approach to revisiting the dynamic causal relationships, this article identifies that the actual inflation has both positive and negative impacts on the expected inflation in distinct sub-periods. Nevertheless, inflation expectation exerts only negative effects on the actual inflation. The results point out that the self-fulfilment of inflation expectations does not exist. Given the bidirectional nexus between the actual and expected inflation, keeping a low and stable inflation is critical to price stability and anchoring of inflation expectation.