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191.

A procedure is suggested for estimating migration distances from data on the proportion of migrants crossing regional boundaries. The method makes use of Buffon's needle, a problem in geometrical probability from the eighteenth century that was originally used as an empirical means of estimating π. The procedure is described for various scenarios that differ in their assumptions about region shape, the spatial distribution of population, and the distribution of migration distances. An application to migration distances in the United States is given, and additional attention is given to the estimation of intraregional migration distances.  相似文献   
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This article engages with problems that are usually opaque: What trajectories do scientific debates assume, when does a scientific community consider a proposition to be a fact, and how can we know that? We develop a strategy for evaluating the state of scientific contestation on issues. The analysis builds from Latour's black box imagery, which we observe in scientific citation networks. We show that as consensus forms, the importance of internal divisions to the overall network structure declines. We consider substantive cases that are now considered facts, such as the carcinogenicity of smoking and the non-carcinogenicity of coffee. We then employ the same analysis to currently contested cases: the suspected carcinogenicity of cellular phones, and the relationship between vaccines and autism. Extracting meaning from the internal structure of scientific knowledge carves a niche for renewed sociological commentary on science, revealing a typology of trajectories that scientific propositions may experience en route to consensus.  相似文献   
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The surveillance of multivariate processes has received growing attention during the last decade. Several generalizations of well-known methods such as Shewhart, CUSUM and EWMA charts have been proposed. Many of these multivariate procedures are based on a univariate summarized statistic of the multivariate observations, usually the likelihood ratio statistic. In this paper we consider the surveillance of multivariate observation processes for a shift between two fully specified alternatives. The effect of the dimension reduction using likelihood ratio statistics are discussed in the context of sufficiency properties. Also, an example of the loss of efficiency when not using the univariate sufficient statistic is given. Furthermore, a likelihood ratio method, the LR method, for constructing surveillance procedures is suggested for multivariate surveillance situations. It is shown to produce univariate surveillance procedures based on the sufficient likelihood ratios. As the LR procedure has several optimality properties in the univariate, it is also used here as a benchmark for comparisons between multivariate surveillance procedures  相似文献   
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Recent years have seen rapid technological changes and these have impacted on social work and social work education. Social work educators struggle to keep pace with these changes. Drawing on the author's own experience, this article outlines some key resources that are available to social work educators and students, reflects on the role of 'Communication and Information Technology' within the social work curriculum, and looks towards future developments in relation to online learning.  相似文献   
197.
Assessment of social work students: Standpoint and strong objectivity   总被引:1,自引:0,他引:1  
The aim of this paper is to consider epistemological issues relating to the assessment of social work students. It will review the development of social work education and in particular the changes that have occurred in assessing the practice of social work students in England and Wales. It explores models of practice assessment. Factors relating to maintaining professional standards, whilst taking into consideration issues of justice, are addressed. It explores the potential benefits of using a second opinion in the assessment of marginal or failing students on practice placement. Assessment is linked to how students may perform as qualified practitioners; this raises issues related both to the nature of objectivity, and standpoint in assessment.  相似文献   
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Temporary “guestworker” programs are often assumed to have less impact on native-born workers than permanent immigration. However, there are theoretical reasons to expect temporary immigrants to accept lower wages and thus for temporary migration to have a greater adverse impact on receiving country wages. This article develops these theoretical insights and tests for differences in wages paid to temporary and permanent undocumented Mexican immigrants. Survey data from Mexico shows that temporary immigrants earned wages about 12% lower than permanent immigrants. Controlling for human and social capital, a 7.4% difference in wages remains. Among married immigrants, temporary immigrants earn 9.6% lower wages with these same controls.  相似文献   
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Chuck Tilly’s late work on coercion, capital, and trust is provocative when applied to changes in urban form. Extending those categories for use in tracing the history of conflicts in cities about how development should be handled highlights the changing roles of economic and physical and cultural power, and the growing importance of trust in these processes. This is a speculative article with a political hope. The speculation is around the potential of using an expanded version of key categories of Charles Tilly’s to create a framework for understanding the nature of change in the form of cities over time. The political hope is to use that framework to illuminate the possibilities of social change in cities today in the direction of social justice.  相似文献   
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