Value-at-Risk Forecasting of Chinese Stock Index and Index Future Under Jumps,Permanent Component,and Asymmetric Information

This article investigates the performance of time series models considering the jumps, permanent component of volatility, and asymmetric information in predicting value-at-risk (VaR). We use evaluation statistics including size and variability, accuracy, and efficiency to determine some suitable VaR measures for the Chinese stock index and its futures. The results reveal that models with jumps can provide VaR series that are less average conservative and have higher variability. Furthermore, additional considering the permanent component of volatility and asymmetric effect can induce more accurate and efficient risk measure in the long and short positions of the stock index and its futures.     

Multidimensional Competition and Corporate Disclosure

In this paper, we argue that the influence product market competition exerts on disclosure is defined by the combined effect of the incentives and disincentives to disclose raised by the multiple competition dimensions. We distinguish between firm‐ and industry‐level competition measures, and we hypothesize that the former raises agency and proprietary costs, whereas the latter creates incentives to disclose either to fulfil the owners’ need for information to monitor managers or to deter the entrance of new competitors in the industry. Our research design allows for non‐monotonic relationships between competition and disclosure as well as for interactions between competition dimensions. Using a sample of US manufacturing companies, we gather evidence that is consistent with our hypotheses. First, we find an inverted U‐shape relationship between corporate disclosure and a firm's abnormal profitability, which is suggestive of firms being reluctant to disclose when they are underperforming (outperforming) their rivals because of the fear of unveiling agency conflicts (raising proprietary costs). Second, we observe a U‐shape relationship between corporate disclosure and industry profitability, although this U design evolves to approximate a rising function as the protection provided by entry barriers increases.     

Transaction costs and competition among audit firms in local markets

We develop a measure to capture an audit firm's competitive position in a local audit market based on the transaction costs of changing audit firms included in DeAngelo's (1981) multi-period audit pricing model. Our competition measure reflects the size difference between the largest audit firm in a market specified by client industry at the city level and the other audit firms operating in that market. We find that audit fees of a client decrease as this size difference increases. This result suggests that smaller audit firms charge lower audit fees because of their competitive disadvantage to the local largest firm.     

Disclosure of provisions for decommissioning costs in annual reports of oil and gas companies: A content analysis and stakeholder views

This study examines the extent of compliance with accounting disclosure requirements relating to provisions for decommissioning costs by oil and gas companies. We also investigate the views of stakeholders on the reporting practices of these companies. Using a content analysis approach, our findings reveal that compliance is substantially high, but companies tend to take a tick-box approach providing only minimum disclosure requirements. In semi-structured interviews, we find that disclosure decisions were driven by concerns about the credibility of information due to complexities in the accounting processes, regulatory requirements, lack of information demand and proprietary costs. These findings have policy implications.     

Nexus between telecommunication infrastructures,economic growth and development in Africa: Panel vector autoregression (P-VAR) analysis

This study examines the causal-effect relationship between telecommunication infrastructures, economic growth and development in selected African countries. It further estimates the trivariate impacts of telecommunication infrastructures, economic growth and development in the region. The analysis considers a panel of forty-six African countries from 2000 to 2015. To measure economic growth, real gross domestic product serves as the proxy, while economic development is measured by the Human Development Index, and telecommunication infrastructures by a composite index of telecommunication computed from mobile line, fixed line and internet access penetration via principal component analysis (PCA). The empirical results suggest the existence of a bidirectional long-run relationship between telecommunication infrastructures, economic growth and development. The causality tests reveal that there is feedback causality between telecommunication infrastructures, economic growth and development. Telecommunication infrastructures promote economic growth and development in Africa and vice versa. Thus, there is need to promote inclusive and holistic policies that will enhance digital provide, economic growth and development simultaneously in Africa. An increase in telecommunication infrastructures will encourage aggregate output and standard of living to move in the same direction in Africa.     

The dynamics of CEO equity vs. inside debt and firm performance

This paper provides new evidence on the comparative dynamic effects of CEO inside debt and equity compensation on firm performance as measured by Tobin’s Q. In contrast to the extant literature, we find significant empirical evidence supporting the classic Jensen and Meckling (1976) premise that managers should receive debt vs. equity compensation in proportion to the capital structure of the firm. We also provide new evidence showing that the effects of the CEO compensation structure on firm performance are dependent on the CEO’s time horizon, as measured by the expected period of employment to retirement. We show that the incremental benefits of equity compensation to performance increase with the CEO’s projected time to retirement. A similar, but insignificant relationship is observed for CEO inside debt compensation. Cash compensation is more beneficial to the firm when concentrated near the end of the CEO’s tenure.     

SEC confidential treatment and regulatory filing reviews

We study the interplay between the redaction of information from regulatory filings and SEC monitoring of the redacting firms. We find that redactions are associated with more intense SEC monitoring, as evidenced by higher incidence of comment letters and a longer letter resolution process. Hand collected data indicate seller firms that redact information from their sales, licensing, and royalty contracts are more likely to receive revenue recognition-related comment letters, suggesting spurious correlation is not a likely explanation of the inference. We supplement our findings by providing evidence that redacting firms tend to manage proprietary information disclosure, withholding proprietary information that should be made public under extant rules and regulations. Our findings shed light on how various SEC monitoring processes interact and support one another, offering a novel look on the interaction between a firm’s management of proprietary information disclosure and regulatory oversight.     

基于状态空间模型的脑电去伪迹与节律提取

利用状态空间建模方法实现脑电时间序列的去伪迹与节律提取。通过建立脑电时间序列的自回归滑动平均模型,并将其表示成状态空间并联隔间形式,利用Kalman滤波器对状态进行递推估计实现脑电信号节律提取及去伪迹。给出了单导和多导闭眼静息脑电的两个应用实例,并将多导脑电估计结果和独立成分分析进行了比较。结果表明,该方法能较好地估计出眼动伪迹、工频干扰、alpha节律等成分,且此三种成分与状态转移矩阵的特征值存在对应关系;同时多导脑电估计克服了独立成分的限制,能够得到更多的成分变量。     

Effects of degrees of acceptance and awareness on a rate system for lowering mobile bills

South Korea has the highest mobile bills among the OECD countries, and there is strong public demand in the country to reduce expenditure amounts. In response, the South Korean government and mobile carriers have implemented measures such as a “Smart Choice Service,” data-centered plan, and 20% discount scheme in order to reduce mobile bills. However, it is unclear whether these systems have actually led to such a reduction. The present study analyzes quantitatively how people's acceptance and awareness toward rate systems reduce or do not reduce mobile bills, based on the results of a survey conducted here. More specifically, to solve the endogeneity problem of saving behavior's effect on mobile bills, the study adopts the instrumental variables of degree of acceptance and awareness of systems relating to mobile bills. The results show that acceptance and awareness of the system do affect savings behavior and thus mobile bills. If the degree of savings behavior (affected by acceptance and awareness) goes up one step on a seven-point Likert-type scale, there is an average 8.28% savings effect on mobile bills. Thus, this study shows that degrees of acceptance and awareness of the rate system do affect mobile bills.