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181.
Bar?? K. Y?rük 《Journal of population economics》2012,25(1):219-243
Recent studies document that people are much more likely to donate to charity and volunteer their time when they are asked to. Using household surveys of giving and volunteering in the United States conducted from 1992 to 2001, which contain questions on whether the respondent was personally asked to give or volunteer, this paper investigates the factors associated with the probability of receiving a charitable solicitation and presents substantial evidence that race and gender differences play key roles in the selection of potential donors. In particular, males, blacks, and Hispanics are less likely to be solicited compared with females and whites. Using non-linear decomposition techniques, I find that differences in observable characteristics of individuals explain most of the racial gap in the probability of being solicited for charitable causes, but they fail to explain the gender gap in the probability of being asked to volunteer. Furthermore, these results are robust to alternative specifications. I also discuss related policy implications and argue that the economic impact of selecting potential donors based on gender and race can be considerable. 相似文献
182.
Nilgün Özgül 《统计学通讯:理论与方法》2019,48(2)
The aim of this letter to acknowledge of priority on calibration estimation. There are numerous studies on calibration estimation in literature. The studies on calibration estimation are reviewed and it is found out that an existing calibration estimator is reprocessed in the recent paper published by Nidhi et al. (2007). 相似文献
183.
İlknur Özmen 《统计学通讯:理论与方法》2013,42(12):2109-2127
In this study, estimation of the parameters of the zero-inflated count regression models and computations of posterior model probabilities of the log-linear models defined for each zero-inflated count regression models are investigated from the Bayesian point of view. In addition, determinations of the most suitable log-linear and regression models are investigated. It is known that zero-inflated count regression models cover zero-inflated Poisson, zero-inflated negative binomial, and zero-inflated generalized Poisson regression models. The classical approach has some problematic points but the Bayesian approach does not have similar flaws. This work points out the reasons for using the Bayesian approach. It also lists advantages and disadvantages of the classical and Bayesian approaches. As an application, a zoological data set, including structural and sampling zeros, is used in the presence of extra zeros. In this work, it is observed that fitting a zero-inflated negative binomial regression model creates no problems at all, even though it is known that fitting a zero-inflated negative binomial regression model is the most problematic procedure in the classical approach. Additionally, it is found that the best fitting model is the log-linear model under the negative binomial regression model, which does not include three-way interactions of factors. 相似文献
184.
Statistics and Computing - We introduce and analyze a parallel sequential Monte Carlo methodology for the numerical solution of optimization problems that involve the minimization of a cost... 相似文献
185.
ABSTRACTIn this article, we explore China Mieville’s novel The City and the City as a literary experiment for analyzing the dynamics of public secrecy. We explore public secrets as an intrinsic part of organizational life and as a framework for paying attention to the politics of organizing. First, we focus on the novel’s invention and use of the verb ‘unseeing’ to bring out the embodied and sensuous aspects of public secrecy as part of organizational processes. Second we unfold how, although the content of public secrets may turn out to be less spectacular than expected, it is exactly their mundaneness which is key to their political importance. This is important because in an increasingly disorganized and uncertain world, secrecy proliferates and the visibility of secrecy is often a strategic move to justify certain hidden actions. 相似文献
186.
Foreign Employers as Relief Routes: Women,Multinational Corporations and Managerial Careers in Japan
Ödül Bozkurt 《Gender, Work and Organization》2012,19(3):225-253
This article argues that multinational corporations may provide critical relief routes for women workers' progress in managerial careers in national contexts where their career paths with domestic employers remain blocked by traditional and institutional practices. It illustrates this possibility through a study of two women managers at the local head office of a foreign‐owned multinational retailer in Japan and their career trajectories. The alternative career paths through foreign employers are not without their contingencies and constraints, and the article identifies the limitations of the transformative potential foreign employers could have in the larger realm of women's managerial employment in a restrictive context such as Japan. Noting that globalization incorporates different groups of workers into the global economy with different costs and rewards, the article concludes by calling for a more nuanced understanding of women's employment with multinationals and for further research that remains cognizant of the multiplicity of experiences in different contexts. 相似文献
187.
The aim of this study was to investigate whether psychosocial factors at work are related to low-back pain among nursing personnel. It was conducted as a short-term follow-up study of 200 Danish female nursing personnel, providing care for the elderly. Self-reported measures of psychosocial factors such as time pressure, emotional demands of clients, control and social support were obtained by questionnaire at baseline, while stress, physical exertion and low-back pain were reported by diary records made in two, three-day periods in the subsequent 6 months. The study examines the possible influence of psychosocial factors preceding low-back pain as well as stress and physical exertion reported simultaneously with low-back pain. Only stress was associated with low-back pain (Odds Ratio (OR)=2.3; Confidence Interval (CI)=1.3-3.9) while neither physical exertion or any of the psychosocial factors were related to low-back pain. A possible pathway connecting emotional demands of clients to low-back pain through the mediation of stress was suggested. 相似文献
188.
Today, chemical risk and safety assessments rely heavily on the estimation of environmental fate by models. The key compound‐related properties in such models describe partitioning and reactivity. Uncertainty in determining these properties can be separated into random and systematic (incompleteness) components, requiring different types of representation. Here, we evaluate two approaches that are suitable to treat also systematic errors, fuzzy arithmetic, and probability bounds analysis. When a best estimate (mode) and a range can be computed for an input parameter, then it is possible to characterize the uncertainty with a triangular fuzzy number (possibility distribution) or a corresponding probability box bound by two uniform distributions. We use a five‐compartment Level I fugacity model and reported empirical data from the literature for three well‐known environmental pollutants (benzene, pyrene, and DDT) as illustrative cases for this evaluation. Propagation of uncertainty by discrete probability calculus or interval arithmetic can be done at a low computational cost and gives maximum flexibility in applying different approaches. Our evaluation suggests that the difference between fuzzy arithmetic and probability bounds analysis is small, at least for this specific case. The fuzzy arithmetic approach can, however, be regarded as less conservative than probability bounds analysis if the assumption of independence is removed. Both approaches are sensitive to repeated parameters that may inflate the uncertainty estimate. Uncertainty described by probability boxes was therefore also propagated through the model by Monte Carlo simulation to show how this problem can be avoided. 相似文献
189.
Abstract. The view of manufacturing has changed in recent years. This is evident from how the focus of management's attention is shifting more and more towards the basics of operating the business. The challenge to manufacturers in the West today is how to introduce leaner practices in their operations. The objective of this paper is to demonstrate how computer technology and information systems can be applied to support the transition to leaner practices in a complex operation. The problem with the large information systems developed to manage the complex operations of many Western companies is that they were designed to help maintain performance and not to support finding opportunities for new improved practices. Results from the ESPRIT II project, CIM for Multi-supplier Operations (CMSO), show that an existing data infrastructure can be effectively utilized to develop inexpensive, customized tools to support a process of continuous improvements. In this project a set of tools for planning the material flow from supplier to the assembly line was developed for the Saab-Valmet automobile assembly plant in Uusikaupunki, Finland. Hypertext tools were used to quickly develop decision support applications that supported problem solving and finding improvement potentials. 相似文献
190.
Dag Wollebæk 《Rural sociology》2010,75(1):144-166
This article uses unique community‐level data aggregated from censuses of associations to analyze growth and volatility in rural populations of grassroots associations. A qualitative comparative analysis (QCA) shows that the two main paths to growth were (1) centralization in polycephalous (multicentered) municipalities and (2) population growth in secular municipalities. High volatility occurs in (1) societies exposed to metropolitan sprawl and (2) traditional peripheral communities with high organizational density and little sociocultural change. Despite this volatility, associational life expanded in the sprawling areas that underwent extensive sociocultural change as well as in the peripheral areas where centralization took place. By contrast, more static peripheries experienced decline. The findings challenge romanticized images of stable, small‐scale communities and nuance the negative view on metropolitan sprawl. 相似文献