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A two-way contingency table in which both variables have the same categories is termed a symmetric table. In many applications, because of the social processes involved, most of the observations lie on the main diagonal and the off-diagonal counts are small. For these tables, the model of independence is implausible and interest is then focussed on the off-diagonal cells and the models of quasi-independence and quasi-symmetry. For ordinal variables, a linear-by-linear association model can be used to model the interaction structure. For sparse tables, large-sample goodness-of-fit tests are often unreliable and one should use an exact test. In this paper, we review exact tests and the computing problems involved. We propose new recursive algorithms for exact goodness-of-fit tests of quasi-independence, quasi-symmetry, linear-by-linear association and some related models. We propose that all computations be carried out using symbolic computation and rational arithmetic in order to calculate the exact p-values accurately and describe how we implemented our proposals. Two examples are presented. 相似文献
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Standard tools for the analysis of economic problems involving uncertainty, including risk premiums, certainty equivalents and the notions of absolute and relative risk aversion, are developed without making specific assumptions on functional form beyond the basic requirements of monotonicity, transitivity, continuity, and the presumption that individuals prefer certainty to risk. Individuals are not required to display probabilistic sophistication. The approach relies on the distance and benefit functions to characterize preferences relative to a given state-contingent vector of outcomes. The distance and benefit functions are used to derive absolute and relative risk premiums and to characterize preferences exhibiting constant absolute risk aversion (CARA) and constant relative risk aversion (CRRA). A generalization of the notion of Schur-concavity is presented. If preferences are generalized Schur concave, the absolute and relative risk premiums are generalized Schur convex, and the certainty equivalents are generalized Schur concave. 相似文献
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ROBERT N. MEFFORD 《Business and Society Review》2011,116(1):109-143
The economic rationale to operate a global supply chain in a sustainable manner is developed. Arguments are made based on marketing, finance, and production theories that by engaging in socially responsible behavior the firm will increase sales, decrease costs, reduce financial risk, and increase profits, which will ultimately increase returns to the firm's shareholders. A model is developed of the mechanism by which modern production methods such as lean production and quality management result in sustainable corporate behavior that, in the long run, translates into higher stock valuations. The production effects cause marketing and financial risk effects that are complementary, and all three channels of influence synergistically result in higher stock values in the model. These effects also provide important benefits to other stakeholders of the firms including employees, customers, the environment, and the community. An important ethical issue in global supply chains is working conditions in foreign plants often leading to allegations of sweatshop labor conditions. This issue is used to illustrate how lean production practices can affectconsumers, employees, and financial risk. Conclusions from the sweatshop labor issue are shown to apply to other sustainability issues as well. 相似文献
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JOHN F. PREBLE 《Business and Society Review》2010,115(3):329-366
Widespread trade liberalization and economic integration characterize the current era of globalization. While this approach has resulted in significant job creation, improved living standards, and a wider variety of cheaper consumer goods and services, opponents question if globalization's benefits outweigh the dislocations and downsides that it causes. Protestors are intent on stalling or rolling back globalization's progression and our review of the history of globalization reveals that a backlash is not without precedent. The article carefully examines the myth and reality of these two opposing positions on four key areas of the globalization debate: jobs; inequality and poverty; national sovereignty and cultural diversity; and the natural environment. This information is then utilized to derive a broad set of feasible policy recommendations that could help bring about a more sustainable form of globalization. 相似文献
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MARIA CLAUDIA LOPEZ JAMES J. MURPHY JOHN M. SPRAGGON JOHN K. STRANLUND 《Economic inquiry》2012,50(1):131-142
This paper presents the results from a series of framed field experiments conducted in fishing communities off the Caribbean coast of Colombia. The goal is to investigate the relative effectiveness of exogenous regulatory pressure and pro‐social emotions in promoting cooperative behavior in a public goods context. The random public revelation of an individual's contribution and its consequences for the rest of the group leads to significantly higher public good contributions and social welfare than regulatory pressure, even under regulations that are designed to motivate fully efficient contributions. (JEL C93, H41, Q20, Q28) 相似文献
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This article reviews the history of political polls in Britainsince 1945, when the first such poll was conducted, and examinescurrent topical issues, including the relationship between themedia and the polls. 相似文献