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91.
ABSTRACTWe consider the case of production units arranged into a number of groups. All units within a group choose output–input combinations from the same production possibilities set that is represented by a stochastic frontier model. The metafrontier is the envelope of the group-specific frontiers. We are interested in the metafrontier distance, which is the amount by which the group-specific frontier lies below the metafrontier.Previous work has measured the metafrontier distance using the deterministic portion of the frontier. In a stochastic frontier model, this is not appropriate. We show how to evaluate the metafrontier distance, and we demonstrate the empirical relevance of this issue. 相似文献
92.
Patricia Reynaud-Bouret Vincent Rivoirard Christine Tuleau-Malot 《Journal of statistical planning and inference》2011,141(1):115-139
This paper deals with the classical problem of density estimation on the real line. Most of the existing papers devoted to minimax properties assume that the support of the underlying density is bounded and known. But this assumption may be very difficult to handle in practice. In this work, we show that, exactly as a curse of dimensionality exists when the data lie in Rd, there exists a curse of support as well when the support of the density is infinite. As for the dimensionality problem where the rates of convergence deteriorate when the dimension grows, the minimax rates of convergence may deteriorate as well when the support becomes infinite. This problem is not purely theoretical since the simulations show that the support-dependent methods are really affected in practice by the size of the density support, or by the weight of the density tail. We propose a method based on a biorthogonal wavelet thresholding rule that is adaptive with respect to the nature of the support and the regularity of the signal, but that is also robust in practice to this curse of support. The threshold, that is proposed here, is very accurately calibrated so that the gap between optimal theoretical and practical tuning parameters is almost filled. 相似文献
93.
Christine E. Ryan 《Serials Review》2013,39(2):136-138
AbstractIn December 2012, Eric Hanson interviewed Christopher Cronin, director of technical services at the University of Chicago, about their participation as an RDA test partner and issues surrounding RDA training and implementation. 相似文献
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95.
Although still a neglected area, over the years a growing body of sociological research on the position of ethno-racial minorities in Western artistic fields has emerged. With this article we aim to contribute to this research area by focusing on ethno-racial diversity in the Dutch literary field. Through in-depth interviews, we analyse how gatekeepers mobilise specific cultural repertoires and by doing so draw ethno-racial boundaries when discussing acquisition, assessing quality and positioning themselves in the literary field. We argue that literary publishers and other professionals (selectively) employ an ‘old school’ modernist repertoire that especially values the formal aspects of literary products, by which non-white writers and publishers concerned with diversity are often positioned in an identity politics framework. Their work is said to take in a less prestigious ‘political’/’subjective’ position rather than a ‘literary’/‘universal’ one. As such, this paper informs on how gatekeepers’ practices shape the position of non-white authors in the Dutch literary field. 相似文献
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This article explores an innovation in teaching policy practice at the undergraduate level. It analyzes an experiential learning model that uses current social challenges as a compelling way to generate student learning about policy practice. Over the course of the semester, students examine antecedents, current issues, and potential solutions to a contemporary social issue through a series of assignments that build knowledge and skills and link the topic to larger social policy concerns. Using quantitative and qualitative evidence from seven semesters, the article explores benefits and challenges of this approach to teaching, and derives lessons for social work education. 相似文献
98.
Dialogue in the sense of David Bohm invites individuals and groups to consider together their ways of thinking and learning. By exploring mental models, which usually hinder reaching deeper agreement, this kind of dialogue opens new grounds and is, at the latest, since Peter Senge’;s management-bestseller “The fifth discipline” (1990), considered to be a basic process for team learning in groups and organisations. The article refers to university projects on ‘open dialogue’ with students at the universities of Oldenburg and Bochum between 2001–2003. Characteristics of “open dialogue” are represented as ways of attentiveness learning. Students practical reports are used to work out recommendations based upon “open dialogue” for the development of central deep ecology and human competences. 相似文献
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Christine A. Dietz 《Journal of Social Work Education》2013,49(3):503-520
In the new millennium, oppression will continue to affect social workers’ clients. This article discusses training clinical practitioners to address oppression. Drawing on poststructural, postmodern, feminist, and social constructivist theories, the article argues that to challenge oppression, clinical practice must address the dialectical relationship between private troubles and public issues while transforming professional relationships that disempower clients. The article describes a second-year MSW clinical practice sequence taught from feminist, poststructuralist, postmodern, and social constructionist perspectives, where students learn to assess the impacts of oppression, discover clients’ strengths, and respond in personal, social, and political contexts. 相似文献