Stock market volatility forecasting: Do we need high-frequency data?

The general consensus in the volatility forecasting literature is that high-frequency volatility models outperform low-frequency volatility models. However, such a conclusion is reached when low-frequency volatility models are estimated from daily returns. Instead, we study this question considering daily, low-frequency volatility estimators based on open, high, low, and close daily prices. Our data sample consists of 18 stock market indices. We find that high-frequency volatility models tend to outperform low-frequency volatility models only for short-term forecasts. As the forecast horizon increases (up to one month), the difference in forecast accuracy becomes statistically indistinguishable for most market indices. To evaluate the practical implications of our results, we study a simple asset allocation problem. The results reveal that asset allocation based on high-frequency volatility model forecasts does not outperform asset allocation based on low-frequency volatility model forecasts.     

Cross‐Functional Integration: Concept Clarification and Scale Development

The centrality of cross‐functional integration (CFI) to supply chain theory and practice has long been recognized. Yet researchers continue to struggle with consistently defining or measuring the CFI construct, thus limiting the utility of CFI research. This research develops (1) a comprehensive definition of CFI that synthesizes previous supply chain research and (2) a valid set of scale items that measure the conceptual domain outlined by this definition. The goal is to build a common foundation for extending knowledge on CFI's antecedents and consequences, and ultimately to improve scholars’ ability to guide a broader practitioner community still struggling to achieve integration in their organizations.     

金融控股公司组织效率的比较分析

金融控股公司、全能银行和战略联盟三者相比,金融控股公司和战略联盟的负向范围效率一般小于全能银行;金融控股公司的正向范围效率一般弱于全能银行而强于战略联盟.总体上,金融控股公司比战略联盟具有范围效率优势.     

增值税征税范围的国际比较与思考

本文通过对国际上实施增值税国家的增值税征税范围的比较分析 ,指出我国现行增值税在征税范围上存在的对于农业和劳务处理方面的问题。提出借鉴外国增值税转型经验改革我国增值税制在征税范围上的规定 ,以完善我国增值税制度     

Another look at long memory in common stock returns

We apply the modified rescaled range test to the return series of 1,952 common stocks. The results indicate that long memory is not a widespread characteristic of these stocks. But logit models of the event of a test rejection reveal that rejections are linked to firms with large risk-adjusted average returns. The maximal moment of a return distribution is also found to influence the event of a rejection, but not in a way suggestive of moment-condition failure. Evidence suggestive of survivorship bias is also uncovered. We conclude that there is some evidence consistent with persistent long memory in the returns of a small proportion of stocks.     

新形势下医院内审范围及内容的思考

本文主要介绍了新形势下医院内审的范围及内容,并针对审计工作范围及内容扩大这一情况,提出了相应的解决对策。     

Semi-parametric dynamic asymmetric Laplace models for tail risk forecasting,incorporating realized measures

This paper extends the joint Value-at-Risk (VaR) and expected shortfall (ES) quantile regression model of Taylor (2019), by incorporating a realized measure to drive the tail risk dynamics, as a potentially more efficient driver than daily returns. Furthermore, we propose and test a new model for the dynamics of the ES component. Both a maximum likelihood and an adaptive Bayesian Markov chain Monte Carlo method are employed for estimation, the properties of which are compared in a simulation study. The results favour the Bayesian approach, which is employed subsequently in a forecasting study of seven financial market indices. The proposed models are compared to a range of parametric, non-parametric and semi-parametric competitors, including GARCH, realized GARCH, the extreme value theory method and the joint VaR and ES models of Taylor (2019), in terms of the accuracy of one-day-ahead VaR and ES forecasts, over a long forecast sample period that includes the global financial crisis in 2007–2008. The results are favorable for the proposed models incorporating a realized measure, especially when employing the sub-sampled realized variance and the sub-sampled realized range.     

An excellent approximation for the m out of n day provision

The m out of n day provision (MooN) of convertible bonds is difficult to handle. To approximating the MooN better, this paper proposes an approach named the conditional range probability (CRP). CRP is the simulated probability of the MooN being reached within a price range at a future time, conditional on today’s price of the underlying, and can be incorporated into any conventional derivatives pricing method. For a purposely designed exotic call option with a 20 out of 30 day provision, CRP under finite difference is found to outperform significantly several existing approaches and produce a mean pricing error of 1% over a wide range of initial underlying prices for the exotic call. The result implies that finite difference utilizing CRP will yield excellent approximating prices for convertible bonds.     

Pick a card: Price ranges and gift card choice

Gift cards are wildly popular with consumers. Vast assortments of gift cards are available at many regional and national retail stores (e.g., grocery, convenience, home improvement). The present research examines consumer reactions to price range amounts displayed on gift cards (e.g., $20-$100; $25-$250). Commonly affixed to gift cards to convey possible purchase loads, price ranges appear to serve as contextual information for a desired purchase load as a gift that can affect beliefs about the recipient's views of the gift card i.e., metaperceptions. Specifically, these metaperceptions tend to be more negative for a gift card displaying a price range when the desired purchase load is the lower bound rather than the upper bound. These beliefs can, in turn, affect gift card choice, but only when social risk is applicable. Four studies provide support for the theory.     

由个案谈损害赔偿的责任主体分析

法律关系不同,赔偿责任主体、责任范围也将不同。对蕴涵着复杂法律关系的损害赔偿案件,只有全面、系统剖析各种法律关系,才能准确地把握责任主体和责任范围,正确地做出法律适用选择,公正、合理地处理案件。