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11.
Carlos N. Bouza 《Metrika》2002,56(2):171-179
The estimation of the population mean when ranked set sampling [rss] is used for selecting the sample and non responses [nr]
are present, is studied. The nr stratum is sub sampled using simple random sampling with replacement. Two strategies are analyzed.
One of them is based on the selection of a sub sample from the nr in each cycle. The other uses sub samples selected among
the nr in each rank.
The accuracy of the proposed estimators is characterized by the corresponding expected variances. Simulations and real life
data are used for analyzing the behavior of them.
Acknowledgements: This paper was developed partially during the visit of the author to Université des Antilles et Gouyane. The author gratefully
acknowledges the helpful suggestions of the referees and thanks the support of DAAD for visiting Humboldt University where
a version of the paper version was made. 相似文献
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14.
This paper formalizes the commonsensical hypothesis that resource scarcity causes a large allocation of time and effort to appropriative competition. Our main innovation is to model explicitly the positive intertemporal effect of consumption on the probability of survival. The critical assumption is that this effect becomes stronger as resources become scarcer. We also show that anticipated future resource abundance increases the incremental value of survival and, consequently, amplifies the current allocation of time and effort to appropriative competition. Interestingly, if resources are currently scarce, then larger anticipated future abundance can cause a big enough increase in the time and effort allocated to appropriative competition to result in a decrease in the sum of current and expected future utility, a “paradox of anticipated abundance”. 相似文献
15.
2006年2月10日,厦门第一家纯外资贸易公司——亿明(厦门)贸易有限公司成立。注册资金仅2000万日元,虽然市外贸局外贸处曾文生处长对记者表示,这家公司还没有到厦门市贸易发展局登记。但外界纷言。亿明(厦门)贸易有限公司的成立,有着特殊意义,标志着更规范意义上的跨国公司采购时代来临了。尽管它的成立比法国欧尚进入上海晚了4年。[编者按] 相似文献
16.
废线路板热解处理研究现状 总被引:5,自引:0,他引:5
综述了近年来国内外废旧线路板热解处理技术研究现状。着重介绍了废旧线路板热解回收的工艺、热解产物、热解机理和动力学等方面的研究进展,讨论了热解回收技术存在的问题和发展方向。 相似文献
17.
Juan A. Lafuente 《Spanish Economic Review》2002,4(3):201-220
This paper analyses the intraday lead-lag relationships between returns and volatilities in the Ibex 35 spot and futures
markets. Using hourly data, we jointly analyze the interactions between markets, estimating a bivariate error correction model
with GARCH perturbations which captures stochastically the presence of an intraday U-shaped curve for both spot and futures market volatility. Our findings show a bidirectional causal relationship between market
volatilities, with a positive feedback. This two-way transmission of volatility is consistent with market prices evolving
according to a long-run equilibrium relationship, and shocks affecting both markets in the same direction. Our empirical results
also support a unidirectional cross interaction from futures to spot market returns. This pattern suggests that the futures
market leads the spot market in order to incorporate the arrival of new information. 相似文献
18.
This paper analyses the relationship between the presence of organized labour in firms (approximated by the scope of collective bargaining) and the extent of gross worker and job flows. According to the voice theory of Freeman, those firms having a union presence will have lower worker mobility. However, there is no analysis of the effects of the presence of organized labour on gross job flows. Using a Spanish data base, we find evidence of the existence of a voice effect on gross worker flows but not clear support for a voice effect on gross job flows. 相似文献
19.
Juan Gabriel Rodríguez Rafael Salas Irene Perrote 《Oxford bulletin of economics and statistics》2005,67(3):347-368
We provide a partial ordering view of horizontal inequity (HI), based on the Lorenz criterion, associated with different post‐tax income distributions and a (bistochastic) non‐parametric estimated benchmark distribution. As a consequence, several measures consistent with the Lorenz criterion can be rationalized. In addition, we establish the so‐called HI transfer principle, which imposes a normative minimum requirement that any HI measure must satisfy. Our proposed HI ordering is consistent with this principle. Moreover, we adopt a cardinal view to decompose the total effect of a tax system into a welfare gain caused by HI‐free income redistribution and a welfare loss caused by HI, without any additive decomposable restriction on the indices. Hence, more robust tests can be applied. Other decompositions in the literature are seen as particular cases. 相似文献
20.
高技术企业知识体系概念框架及其内部互动模型——一个解释知识创新过程的新框架 总被引:11,自引:0,他引:11
企业知识是组织内部个人知识的集合体 ,但不是个人知识的简单加总。基于这个认识 ,本文构建了一个由知识员工、知识链和知识场构成的点、线、面互动的企业知识体系研究框架。高技术企业是追求持续知识创新的知识体系 ,知识创新通过知识点之间的互动完成 ,如同电荷之间的运动通过电场来进行 ,知识点通过知识场发生相互作用。本文提出了知识场的概念 ,分析了其与Nonaka的“巴”的区别与联系 ,并对其进行了分类。进一步的 ,根据高技术企业知识体系运行的基本路径 ,文章分别研究了体系内知识点通过知识场进行互动的基本模式与作用机制。文章试图提出一个能够解释知识创新过程的新框架。 相似文献