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251.
This study examines how a wide variety of diverse friendship group attributes affect changes in indicators of school performance, social behavior, and mental health between early seventh and late eighth grade. Nine hundred and one middle school students named their friends. Independent data from these friends were used to construct friendship groups that were then characterized in terms of their mean level on measures of academic performance, social behavior, psychological closeness, and structure. Two novel conclusions emerge from the study. First, nearly all the friendship effects are domain‐specific. That is, peer attributes in the school domain affect individual school performance outcomes, while peer attributes in the social behavior domain affect individual social behavior. Second, friends' grade point average (GPA) is the most powerful single friendship attribute. It has the largest total effect, the most consistent effects within its own school performance domain, and the sole reliable cross‐domain impact—on an index of negative social behavior that taps into acting out and drug use. The within‐domain peer effects mostly replicate past findings, though the methodological controls used here are more extensive than in past studies and so provide a stronger causal warrant. 相似文献
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The authors used the 2003 to 2012 American Time Use Survey to examine marital status variation in mothers' leisure time. They found that never‐married mothers have more total leisure but less high‐quality leisure when compared with married mothers. Never‐married mothers' leisure is concentrated in passive and socially isolated activities that offer fewer social and health benefits. Black single mothers have the highest amount of socially isolated leisure, particularly watching television alone. Results suggest that differences in the context and type of leisure are salient dimensions of the divergent and stratified life conditions of married, divorced, and single mothers. 相似文献
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Natural data on the Australian Human Rights Commission’s website outlining the complaint cases generated from Disability Discrimination Act, 1992 (DDA) were used to examine the social construction of disability employment discrimination. Using a social model and human rights citizenship lens, some 987 complaint cases were analysed to assess the prevalence of disability discrimination in employment, and its relationship to the types of disability, gender, entity undertaking the actions and organisational context. Of all complaint cases across the Australian Human Rights Commission’s operations, by far the largest proportion involves disability discrimination. Within the disability discrimination complaint cases, employment makes up the greatest proportion of these cases. In examining the patterns of discrimination seven major themes emerged involving: distinctive patterns across disability type; access to premises; human resource mismanagement; selection of new employees; integration of assistive technology; perception of cost of disability inclusions; and inflexible organisational workplace practices. The discussion examines the underlying reasons for the emergent themes where employers misunderstood key legal concepts that underpin the DDA including: unjustifiable hardship; inherent requirements; reasonable adjustment; direct; and indirect discrimination. The paper concludes by discussing the implications of the findings as a way of understanding the social construction of disability discrimination in employment to signal ways to better develop inclusive organisational practice. 相似文献
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J. P. Eastwood E. Biffis M. A. Hapgood L. Green M. M. Bisi R. D. Bentley R. Wicks L.‐A. McKinnell M. Gibbs C. Burnett 《Risk analysis》2017,37(2):206-218
Space weather describes the way in which the Sun, and conditions in space more generally, impact human activity and technology both in space and on the ground. It is now well understood that space weather represents a significant threat to infrastructure resilience, and is a source of risk that is wide‐ranging in its impact and the pathways by which this impact may occur. Although space weather is growing rapidly as a field, work rigorously assessing the overall economic cost of space weather appears to be in its infancy. Here, we provide an initial literature review to gather and assess the quality of any published assessments of space weather impacts and socioeconomic studies. Generally speaking, there is a good volume of scientific peer‐reviewed literature detailing the likelihood and statistics of different types of space weather phenomena. These phenomena all typically exhibit “power‐law” behavior in their severity. The literature on documented impacts is not as extensive, with many case studies, but few statistical studies. The literature on the economic impacts of space weather is rather sparse and not as well developed when compared to the other sections, most probably due to the somewhat limited data that are available from end‐users. The major risk is attached to power distribution systems and there is disagreement as to the severity of the technological footprint. This strongly controls the economic impact. Consequently, urgent work is required to better quantify the risk of future space weather events. 相似文献
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Dawn Carlson Merideth Ferguson Emily Hunter Dwayne Whitten 《The Leadership Quarterly》2012,23(5):849-859
Building on the theoretical foundations of conservation of resources theory, this research provides insights into the relationship of abusive supervision with work–family conflict (work-to-family and family-to-work). Further, it is the first attempt to incorporate the emotional labor to burnout link as the mediating process between abuse and conflict. Using a sample of 328 individuals working fulltime we examined both the direct relationship of abuse with conflict as well as the indirect relationship through surface acting (emotional labor) and burnout. Our results suggest that abusive supervision influences conflict and the relationship is partially mediated through the surface acting to burnout path. 相似文献
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Exact Sampling from a Continuous State Space 总被引:3,自引:0,他引:3
Propp & Wilson (1996) described a protocol, called coupling from the past, for exact sampling from a target distribution using a coupled Markov chain Monte Carlo algorithm. In this paper we extend coupling from the past to various MCMC samplers on a continuous state space; rather than following the monotone sampling device of Propp & Wilson, our approach uses methods related to gamma-coupling and rejection sampling to simulate the chain, and direct accounting of sample paths. 相似文献