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51.
52.
J. T. Gene Hwang Jing Qiu Zhigen Zhao 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2009,71(1):265-285
Summary. We construct empirical Bayes intervals for a large number p of means. The existing intervals in the literature assume that variances are either equal or unequal but known. When the variances are unequal and unknown, the suggestion is typically to replace them by unbiased estimators . However, when p is large, there would be advantage in 'borrowing strength' from each other. We derive double-shrinkage intervals for means on the basis of our empirical Bayes estimators that shrink both the means and the variances. Analytical and simulation studies and application to a real data set show that, compared with the t -intervals, our intervals have higher coverage probabilities while yielding shorter lengths on average. The double-shrinkage intervals are on average shorter than the intervals from shrinking the means alone and are always no longer than the intervals from shrinking the variances alone. Also, the intervals are explicitly defined and can be computed immediately. 相似文献
53.
David F. Suárez Hokyu Hwang 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2013,24(3):581-605
Nonprofit interactions with businesses have become increasingly diverse, but which nonprofits establish relationships, and to what extent do relationships depend on the form or type of tie? Focusing on nonprofit collaboration with businesses and donations from businesses, we test arguments based on sociological institutionalism and resource dependence theory. We find that nonprofits relying on earned income, nonprofits led by individuals with management degrees, and rationalized nonprofits all are more likely to report collaborations with businesses, aligning with expectations from institutional theory. For donative ties between businesses and nonprofits, we find that rationalized nonprofits are more likely to have charitable gifts from businesses. However, nonprofits with earned income are less likely to have business donations, and funding diversity has a salient positive effect. These results reveal important but paradoxical institutional and resource dependence effects. We conclude with a discussion of our divergent findings and set an agenda for additional research on the topic. 相似文献
54.
Taisik Hwang 《Journal of Media and Religion》2016,15(4):196-209
This study analyzes a sample of 2,614 news articles dealing with religions published in Chosun Ilbo from 1996 to 2005, focusing on how this major newspaper covered Christianity in terms of its tone and frames. The results show that this religion was portrayed in a neutral or positive manner and that both Protestants and megachurches were mostly considered providers of social work services. These findings have implications for academic, media, and religious sectors. 相似文献
55.
This paper discusses the relation among four problems: graph testing, DNA complex screening, superimposed codes and secure
key distribution. We prove a surprising equivalence relation among these four problems, and use this equivalence to improve
current results on graph testing. In the rest of this paper, we give a lower bound for the minimum number of tests on DNA
complex screening model.
The first and second author would like to dedicate this paper to professor Frank K. Hwang on the occasion of his 65th birthday.
This research is partially supported by Republic of China, National Science Council grant NSC 92-2115-M-009-014. 相似文献
56.
The test statistics of assessing multivariate normality based on Roy’s union-intersection principle (Roy, Some Aspects of
Multivariate Analysis, Wiley, New York, 1953) are generalizations of univariate normality, and are formed as the optimal value of a nonlinear multivariate function. Due
to the difficulty of solving multivariate optimization problems, researchers have proposed various approximations. However,
this paper shows that the (nearly) global solution contrarily results in unsatisfactory power performance in Monte Carlo simulations.
Thus, instead of searching for a true optimal solution, this study proposes a functional statistic constructed by the q% quantile of the objective function values. A comparative Monte Carlo analysis shows that the proposed method is superior
to two highly recommended tests when detecting widely-selected alternatives that characterize the various properties of multivariate
normality. 相似文献
57.
Deborah Brautigam Jyhjong Hwang 《Development policy review : the journal of the Overseas Development Institute》2019,37(3):313-330
Recent acceleration of Chinese engagement in African hydropower is attracting increasing attention and concern. Yet there is scant research and little reliable data on this engagement. This article analyses Chinese hydropower engagement based on a new, verified dataset. We examined over 100 projects reported by the media and lists compiled by other organizations, amassing case studies for each project using desk research, interviews and field visits. We demonstrate that Chinese engagement in African hydropower is often overestimated in both numbers and value. Further, misunderstanding and myths abound regarding Chinese financing and construction practices. This evidence‐based understanding provides a firmer foundation for advocacy, research and efforts by other companies and funding agencies to co‐operate with Chinese actors in this controversial sector. 相似文献
58.
This study examined the effect of personal public relations developed through Twitter on cognitive and attitudinal aspects, particularly focusing on the use of Twitter by CEOs. According to the responses of young consumers who participated in this study, their attitudes toward the use of Twitter by CEOs positively influenced their perception of transformational leadership (H1). Further, perceived transformational leadership was positively associated with attitudes toward CEOs using Twitter; this in turn positively influenced attitudes toward corporations (H2). The positive evaluation of the use of Twitter by CEOs directly influenced attitudes toward such CEOs (H3), whereas attitudes toward such use did not influence attitudes toward corporations. The results indicated that microblogging is beneficial for the development of effective personal public relations by corporate leaders. 相似文献
59.
The problem of sequential estimation of the mean with quadratic loss and fixed cost per observation is considered within the
Bayesian framework. Instead of fully sequential sampling, a two-stage sampling technique is introduced to solve the problem.
The proposed two-stage procedure is robust in the sense that it does not depend on the distribution of outcome variables and
the prior. It is shown to be asymptotically not worse than the optimal fixed-sample-size procedures for the arbitrary distributions,
and to be asymptotically Bayes for the distributions of one-parameter exponential family. 相似文献
60.
This experimental study found a main effect of perceived leadership and an interaction effect of perceived leadership and perceived severity of threats on the public's estimation of organizational crisis responses. The results indicate that the contingent theoretical argument explaining the dynamics of organizational factors and situational factors that determine stance taken by public relations practices can also be applied when explaining the outside latent public's thought patterns predicting an organizational stance and message strategy. Contingency theory offers predictive power, not just for the practitioner, but for the public passing judgment on the stance taken by an organization. 相似文献