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991.
This study systematically and comprehensively investigates the small sample properties of the existing and some new estimators of the autocorrelation coefficient and of the regression coefficients in a linear regression model when errors follow an autoregressive process of order one. The new estimators of autocorrelation coefficient proposed here are based on the jackknife procedure. The jackknife procedure is applied in two alternative ways: first to the regression itself, and second to the residuals of the regression model. Next, the performance of the existing and new estimators of autocorrelation coefficient (thirty-three in total) is investigated in terms of bias and the root mean squared errors. Finally, we have systematically compared all of the estimators of the regression coefficients (again thirty-three) in terms of efficiency and their performance in hypothesis testing. We observe that the performance of the autocorrelation coefficient estimators is dependent upon the degree of autocorrelation and whether the autocorrelation is positive or negative. We do not observe a direct link between the bias and efficiency of an estimator. The performance of the estimators of the regression coefficients also depends upon the degree of autocorrelation. If the efficiency of regression estimator is of concern, then the iterative Prais-Winsten estimator should be used since it is most efficient for the widest range of independent variables and values of the autocorrelation coefficient. If testing of the hypothesis is of concern, then the estimators based on jackknife technique are certainly superior and are highly recommended. However, for negative values of the autocorrelation coefficient, the estimators based on Quenouille procedure and iterative Prais-Winsten estimator are comparable. But, for computational ease iterative Prais-Winsten estimator is recommended.
相似文献992.
In the analysis of food expenditures, the use of a simple count of household members as an estimate of household size implicitly assumes each household member has the same marginal impact. In this analysis of Mexican food expenditures, endogenously determined adult equivalence scales are estimated in such a way that these marginal impacts are allowed to vary by household member age and gender. The results of a series of hypothesis tests indicate a rejection of the implied null hypothesis of equal marginal expenditure impacts associated with the use of the traditional count based household size variable. This study also rejects the null hypothesis of the equality of adult equivalent scales across the commodities included in this analysis. 相似文献
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Zach G. Zacharia Nada R. Sanders Brian S. Fugate 《Journal of Supply Chain Management》2014,50(1):73-88
Since its introduction over three decades ago, the field of supply chain management (SCM) has undergone numerous transformations. Today it is a prevailing theme in scholarly and popular research, and numerous disparate disciplines claim its ownership. Despite the field's evolution there continues to be little agreement on the domain and unifying theory of SCM, as well as a consensus definition. The result has been a lack of clarity as to the scope of SCM, “siloed” research methodologies, and parallel research efforts. We interviewed 50 academic scholars across disciplines, as well as 20 SCM business executives, to extract commonality of opinion and discuss the future of SCM. The most important of these findings are the identification of “common ground” regarding the definition and scope of SCM, establishment of the need for interdisciplinary research, the recognition of the existence of “inner” and “outer core” functions central to SCM, and the nature of functional involvement in interdisciplinary research. In this paper we present these findings and provide a path forward based on the collective wisdom of these scholars and executives. 相似文献
996.
Brian C. O'Neill 《Revue internationale de statistique》2004,72(2):167-184
Future changes in population size, composition, and spatial distribution are key factors in the analysis of climate change, and their future evolution is highly uncertain. In climate change analyses, population uncertainty has traditionally been accounted for by using alternative scenarios spanning a range of outcomes. This paper illustrates how conditional probabilistic projections offer a means of combining probabilistic approaches with the scenario-based approach typically employed in the development of greenhouse gas emissions projections. The illustration combines a set of emissions scenarios developed by the Intergovernmental Panel on Climate Change (IPCC) with existing probabilistic population projections from IIASA. Results demonstrate that conditional probabilistic projections have the potential to account more fully for uncertainty in emissions within conditional storylines about future development patterns, to provide a context for judging the consistency of individual scenarios with a given storyline, and to provide insight into relative likelihoods across storylines, at least from a demographic perspective. They may also serve as a step toward more comprehensive quantification of uncertainty in emissions projections. 相似文献
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Bruce J. Swihart Brian S. Caffo Ciprian M. Crainiceanu 《Revue internationale de statistique》2014,82(2):275-295
We demonstrate that many current approaches for marginal modelling of correlated binary outcomes produce likelihoods that are equivalent to the copula‐based models herein. These general copula models of underlying latent threshold random variables yield likelihood‐based models for marginal fixed effects estimation and interpretation in the analysis of correlated binary data with exchangeable correlation structures. Moreover, we propose a nomenclature and set of model relationships that substantially elucidates the complex area of marginalised random‐intercept models for binary data. A diverse collection of didactic mathematical and numerical examples are given to illustrate concepts. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
998.
We use wavelet models to surface the relationship between gold miners stock prices and the price of gold. We find that there is little relationship in the short run but some significant and long-standing long-run relationships. Gold prices appear to lead gold miner stock prices. 相似文献
999.
This article describes the HR Management system in place at Quantum. Key emphases of Quantum's HR management infrastructure include: (1) establishment and communication of the firm's mission, vision, and values; (2) team‐based product development and operations teams; (3) behaviorally based structured interview processes; (4) rigorous and comprehensive performance management and incentive compensation processes; (5) highly automated and efficient HR infrastructure “fundamentals”; and (6) well developed soft asset due diligence processes for integrating mergers and acquisitions. Key challenges for the future include (1) managing explosive growth in a global environment, (2) employee development, (3) managing joint ventures and acquisitions, (4) hiring and retaining talent, and (5) expanding competence in change management processes. © 1999 John Wiley & Sons, Inc. 相似文献
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Research summary: We examine whether top managers engage in misconduct, such as illegal insider trading, illegal stock option backdating, bribery, and financial manipulation, in response to the presence, or absence, of governance provisions that impose constitutional constraints on shareholder power. Within the agency framework, shareholders typically oppose governance provisions that limit their power because those provisions could undermine shareholder influence and increase agency costs. However, when shareholders support provisions that constrain their power, managers could respond positively by refraining from self‐interested behavior in the form of managerial misconduct. We find this to be especially true in industries where these governance provisions are particularly relevant to managers and in scenarios where CEOs do not also serve as board chair. Managerial summary: In recent years, shareholders have become central to organizations and the managers who run them. Shareholders and managers establish a rapport with one another, such that the behavior of one affects the behavior of the other. One of the most consequential decisions shareholders can make pertains to the reach of their influence: They can choose to impose strict governance over firms they own or they can allow for constitutional constraints that limit shareholder power. When they act in the mutual interest of managers by allowing such constraints, we find that managers respond in kind by refraining from bad behavior, such as illegal stock options backdating, insider trading, and financial manipulation. This is especially true in industries and scenarios in which shareholder pressure is most relevant to managers. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献