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871.
Montgomery MR Richards T Braun HI 《Journal of the American Statistical Association》1986,81(394):297-309
This study examines the possibility that estimation of the effect of breast-feeding on infant survival is affected by selection bias, in that children who are healthier at birth may be more likely to be breast-fed. Data are from the 1976 Malaysian Family Life Survey. "Ordinary logit models for breast-feeding and survival are estimated, and the results suggest that selection is indeed present. For example, children of higher birth weight appear to be more likely to be breast-fed and likely to survive. In addition, weight at birth and the duration of breast-feeding appear to be linked." Using birth weight as an indicator for the child's health, the authors conclude that "the direct influence of breast-feeding on survival remains of overwhelming importance even after corrections for selection bias are made." 相似文献
872.
Traditional research in leadership has largely relegated followers to the role of passive recipients or, at best, moderators of leader influence and behaviors. However, recent work in the area of followership has begun shifting this focus and emphasizing the possibility that followers actively have an influence over leaders, in particular leader behavior. This paper revisits traditional areas of the leadership literature and builds on the emerging followership literature to reintroduce followers as part of the social context of leaders. In an attempt to build theoretical rationales for how followers influence leader behavior we draw on the social influence (e.g., Social Impact Theory, Latane, 1981) and the power literature to suggest individual (e.g., strength and immediacy of followers) and group level (e.g., number of followers and unity of the group) characteristics that influence leader behaviors as a function of a leader's informational and effect dependence on followers. 相似文献
873.
874.
This article addresses the process of initiation into the Catholic Church by analyzing in‐depth interviews with parish‐based professional initiation coordinators. The formal title given to this process of initiation by the Church since Vatican II is the Rite of Christian Initiation of Adults (RCIA). Since the RCIA's promulgation, the Church has hired a host of lay and religious professionals to coordinate its implementation at the parish level. Our analysis focuses on the temporal sequencing and the problem of duration of initiation. The data show that both city and suburban coordinators adapted the Church's mandated length of time for initiation in different ways as they negotiated covenantal and contractual social relations among RCIA participants. 相似文献
875.
Upper bounds axe derived for the efficiency factor of a class of resolvable incomplete block designs known as latinized designs. These designs are particularly useful in glasshouse and field trials, and can be readily extended to two-dimensional blocking structures. Existing bounds for resolvable designs axe also reviewed and a comparison is made between the third moment bounds discussed by Jarrett (1989) and the second moment bounds of Tjur (1990). 相似文献
876.
877.
Regulations under the 1990 Amendments to the Clean Air Act impose significant requirements on firms handling hazardous chemicals. The nature of the regulations would suggest that small firms, because of limited resources and other structural limitations, would experience more difficulty complying with the regulations than large firms. To understand the difficulties imposed by the regulations on small firms, we interviewed ten small firms in Delaware and New Jersey, states with existing hazardous regulations similar to those being considered by the U.S. Environmental Protection Agency, and evaluated their responses to state regulations. The impacts of the environmental regulations on the firms and on the risk levels of their businesses are discussed. Propositions for research into small firms compliance are developed. Possible means for reducing the regulatory burden on small firms while enhancing regulatory effectiveness are suggested. 相似文献
878.
Acquisitive growth strategies continue to be popular, in spite of increasing evidence that they often do not enhance the financial performance of acquiring firms and may adversely affect innovation. However, some acquisitions are associated with both increases in financial performance and a strengthened commitment to R&D while others experience decreases in both. Multiple theories have been offered to explain acquisitions and their outcomes, but few have received strong empirical support. This paper describes a multiple rater, multiple-case study of acquisitions that had highly favourable outcomes and others that experienced highly unfavourable outcomes. All twelve of the high performing acquisitions studied were found to exhibit the dual characteristics of friendliness during acquisition negotiations and resource complementarities between the two firms. Additionally, debt played an important role in the success (low to moderate debt) or lack of success (high or extraordinary debt) in 21 of the 24 acquisitions studied. Inadequate target evaluation was a factor in 11 of the 12 acquisitions with low performance. Importantly, the results of both sets of acquisitions suggested that a configuration of attributes affected post-acquisition performance. Other findings both supported and contradicted commonly held beliefs about acquisitions, as well as highlighted variables not typically associated with acquisition strategies. The study provides directions for future theory development and empirical research on acquisitions. 相似文献
879.
学科与学术领域的交叉处为创造性的理论构建提供了重要机会。本文中,我们提出了在学科交叉处构建理论的3种模式,并强调了这3种模式的优势与不足。我们运用"影响轮(impact wheel)"把3种模式相互联系起来,直观地描述了它们对理论、学术领域、学科、研究者和外部相关者等五大范围的影响。尽管3种模式对这些方面的影响不尽相同,但当在学科交叉处的理论建构可以修订现有学科和学术领域边界,并产生新的学科和学术领域时,其影响最大。这样的理论建构并不常见,并且需要研究者具有挖掘组织科学更多潜能的特定技巧。 相似文献
880.
我国林业工程项目管理研究 总被引:3,自引:0,他引:3
以大工程带动大发展是我国实现林业跨越式发展的重大战略决策。林业项目单位是工程的主要参与者 ,其管理水平高下直接关系到项目成败。该文通过总结现代项目管理理念 ,结合林业工程项目管理的现状和特点 ,提出林业工程项目管理系统 ,并指出了现代项目管理理念和方法是提高林业项目管理水平的有效途径。 相似文献