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排序方式： 共有725条查询结果，搜索用时 15 毫秒
91.
Summary In this paper a Morgenstern-type bivariate gamma distribution has been studied. Its moment generating function has been derived. The distribution of the product and quotient are derived in terms of the modified Bessel function. The results for the independent case follow as special cases. Further the regression function has been analysed, in terms of its deviation from linear regression function.This research was initiated while the first author was a U.N. Consultant under the Statistical Training Program for Africa, visiting the University of Ghana. 相似文献
92.
Mengying Feng John Mangan Chee Wong Chandra Lalwani 《The Service Industries Journal》2013,33(12):1021-1041
Importance–performance analysis (IPA) is an analytic technique that generates a two-dimensional importance–performance grid, where the values of importance and performance across attributes are plotted against each other. This technique is used to assist service and other firms in prioritizing areas for service improvement when resources are limited. This study contributes to service theory by first performing a comprehensive literature review of four different and commonly used approaches to IPA. Survey data from the ports sector are then used to elucidate the value and the distinctiveness of these four different approaches, and it is also shown how the underlying theoretical assumptions led to somewhat varying, and contradictory interpretations. Subsequently, novel guidelines for integrating results from these four different approaches are proposed. The study advances service theory by detailing the integration of the different approaches to make sense of the importance and performance of diverse service attributes. The integrative approach developed in this paper also provides practitioners with clearer guidance for the application of IPA. 相似文献
93.
Competitiveness has been a subject of study in the manufacturing and related sectors since the early 1990s. However, only recently have some researchers started to examine the tourism and hospitality competitiveness, both conceptually and empirically, with a particular focus on tourism destinations and the hotel industry. The goal of this article is to review the published studies on destination and hotel competitiveness, provide critiques, and point out future directions in tourism and hotel competitiveness research. Such a review shall provide researchers with a good understanding of the current status of competitiveness research and with a vision for advancing the existing knowledge of destination and hotel competitiveness. 相似文献
94.
Yin‐Wong Cheung 《Pacific Economic Review》2002,7(3):465-487
Abstract. Advanced statistical techniques are used to analyze Hong Kong output dynamics. Hong Kong, Japan and the US are found to share some common long‐term and short‐term cyclical variations. While the Hong Kong economy is susceptible to external shocks and Granger‐caused by the other two economies, local factors account for a large proportion of output growth variability and uncertainty. On the transmission mechanism, the selected trade and financial variables have incremental explanatory power but do not lessen the ability of lagged output variables to explain Hong Kong growth dynamics. Interestingly, the US does not appear to exert undue influences on Hong Kong. 相似文献
95.
Christa Cuchiero Walter Schachermayer Ting‐Kam Leonard Wong 《Mathematical Finance》2019,29(3):773-803
Cover's celebrated theorem states that the long‐run yield of a properly chosen “universal” portfolio is almost as good as that of the best retrospectively chosen constant rebalanced portfolio. The “universality” refers to the fact that this result is model‐free, that is, not dependent on an underlying stochastic process. We extend Cover's theorem to the setting of stochastic portfolio theory: the market portfolio is taken as the numéraire, and the rebalancing rule need not be constant anymore but may depend on the current state of the stock market. By fixing a stochastic model of the stock market this model‐free result is complemented by a comparison with the numéraire portfolio. Roughly speaking, under appropriate assumptions the asymptotic growth rate coincides for the three approaches mentioned in the title of this paper. We present results in both discrete and continuous time. 相似文献
96.
Chin-Yoong Wong Yoke-Kee Eng 《The journal of international trade & economic development》2017,26(8):955-978
This paper sheds light on the international spillovers of China's reforms in upgrading industrial capabilities, liberalizing capital account, internationalizing the renminbi, and transition to flexible exchange rates. Drawing on two-country New Keynesian model of endogenous entry and portfolio adjustment, we find that China's industrial upgrading that peddles on yuan appreciation lifts all boats through global production network irrespective of capital account convertibility, degree of renminbi internationalization, and exchange rate reform. Feasibility of appreciation-driven upgrading is called into question, however, when renminbi reform and capital account liberalization go in parallel. We also show that international spillovers disappear once renminbi internationalization is associated with liberalized capital account and flexible renminbi exchange rates. 相似文献
97.
Soo Khoon Goh;Koi Nyen Wong;Robert McNown; 《The World Economy》2024,47(2):440-461
Conventional views hold that low fertility will lead to low economic growth in the future. We examine the case of China, which has experienced decades-long below-replacement fertility, resulting in a rapidly ageing population accompanied by unintended diminished labour force growth. Compensating for the decline in the working-age population, strong internal migration from rural to urban areas continues to sustain a large, growing and productive urban workforce. To analyse these competing forces, this study employs a quasi-structural model with several channels that are crucial to demographic-macroeconomic relationships to assess the potential effects of demographic changes on economic growth in the long run. A long-run relationship exists between the urban working-age population, real capital stock and real GDP (rgdp). Although the total working-age population is projected to shrink, it can be offset by the increased capital stock and continued internal migration to high-productivity urban areas, so rgdp is projected to increase through 2050. Projected trends indicate that domestic savings will be sufficient to finance projected investment. China's continued emphasis on capital-intensive production utilising a highly productive urban labour force plays a dynamic role in increasing output and sustaining economic growth for several decades despite persistent low fertility and population ageing. 相似文献
98.
Using high-frequency intraday data, this study provides strong empirical evidence that elevated oil price uncertainty has a significant and negative influence on stock liquidity. More specifically, the results suggest that large oil-related corporations are most affected, followed by small-listed firms more generally. Further analysis reveals that liquidity providers widen the bid-ask spreads to protect themselves during periods of high oil price uncertainty for large-listed firms, particularly those in the oil industry. These findings are robust to various measures of oil price uncertainty, different market conditions, structural break analysis and show the influence of oil price movements extends to stock liquidity. 相似文献
99.
This paper investigates American option pricing under general diffusion processes. Specifically, the underlying asset price is assumed to follow a diffusion process in which both the dividend yield and volatility are functions of time and the underlying asset price. Using the generalized homotopy analysis method, the determination of the early exercise boundary is separated from the valuation procedure of American options. Then, an exact and explicit solution for American options on a dividend-paying stock is derived as a Maclaurin series. In addition, the corresponding optimal early exercise boundary and the Greeks are obtained in closed-form solutions. A nonlinear sequence transformation, the Padé technique, is used to effectively accelerate the convergence of the partial sums of the infinite series. As the homotopy constructed in this paper is based on a generalized deformation with a shape parameter and kernel function, the error of the homotopic approximation could be reduced further for a fixed order. Numerical examples demonstrate the validity, effectiveness, and flexibility of the proposed approach. 相似文献
100.
Amy S.K. Wong 《期货市场杂志》2012,32(2):152-165
This study examines the quantitative impact of correlation errors on basket options with time‐varying correlations and the risk measures (conditional) value‐at‐risk (VaR) in the framework of Basel II. The results show that risk measure misestimation due to correlation errors are the largest and most asymmetric for the at‐the‐money and out‐of‐the‐money basket option. Delta hedging of the basket option reduces risk but increases size and asymmetry effects substantially. Finally, the square‐root‐of‐time rule for VaR does not adjust adequately to correlation errors and consistently underestimates risk measures, which could lead to the VaR exceedance clustering observed during the recent financial crisis. © 2011 Wiley Periodicals, Inc. Jrl Fut Mark 相似文献