Interval estimation for conformance proportions of multiple quality characteristics

A conformance proportion is an important and useful index to assess industrial quality improvement. Statistical confidence limits for a conformance proportion are usually required not only to perform statistical significance tests, but also to provide useful information for determining practical significance. In this article, we propose approaches for constructing statistical confidence limits for a conformance proportion of multiple quality characteristics. Under the assumption that the variables of interest are distributed with a multivariate normal distribution, we develop an approach based on the concept of a fiducial generalized pivotal quantity (FGPQ). Without any distribution assumption on the variables, we apply some confidence interval construction methods for the conformance proportion by treating it as the probability of a success in a binomial distribution. The performance of the proposed methods is evaluated through detailed simulation studies. The results reveal that the simulated coverage probability (cp) for the FGPQ-based method is generally larger than the claimed value. On the other hand, one of the binomial distribution-based methods, that is, the standard method suggested in classical textbooks, appears to have smaller simulated cps than the nominal level. Two alternatives to the standard method are found to maintain their simulated cps sufficiently close to the claimed level, and hence their performances are judged to be satisfactory. In addition, three examples are given to illustrate the application of the proposed methods.     

语用学在课文理解中的应用

语用学是研究语言的理解和使用的学问。研究的范围包括指示语、　　　语用学在课文理解中的应用　　　　　　　　　　　　　　会话含义、预设等。要使交际取得成功 ,说话者指示语所指信息要清楚 ,交际双方要有共同的语用预设 ,双方还要遵守合作原则     

浅谈如何促进大学生进行有效的合作学习

文章介绍了合作学习的概念及促进合作学习的基本要素 ,探讨了在大学英语教学中如何促进学生进行有效合作学习的具体方法     

Empirical likelihood confidence intervals for the mean of a population containing many zero values

If a population contains many zero values and the sample size is not very large, the traditional normal approximation‐based confidence intervals for the population mean may have poor coverage probabilities. This problem is substantially reduced by constructing parametric likelihood ratio intervals when an appropriate mixture model can be found. In the context of survey sampling, however, there is a general preference for making minimal assumptions about the population under study. The authors have therefore investigated the coverage properties of nonparametric empirical likelihood confidence intervals for the population mean. They show that under a variety of hypothetical populations, these intervals often outperformed parametric likelihood intervals by having more balanced coverage rates and larger lower bounds. The authors illustrate their methodology using data from the Canadian Labour Force Survey for the year 2000.     

Modeling cooperation among self-interested agents: a critique

This paper reviews recent attempts to model cooperation in groups of self-interested unrelated individuals. It concludes that no empirically plausible model has been developed, and the economist's quest for an explanation of human prosociality in terms of self-interested agents has not been successful. We show that the equilibrium criteria employed in standard game-theoretic models have no attractive dynamic properties, and the mechanisms deployed in these models are not generally seen in empirical examples of cooperative groups. We also show that these models are not robust to plausible rates of signaling error and mutation. We present an alternative, involving strongly reciprocal agents, that satisfies all the requirements for a dynamically stable model of cooperation.     

Data tilting for time series

Summary. We develop a general methodology for tilting time series data. Attention is focused on a large class of regression problems, where errors are expressed through autoregressive processes. The class has a range of important applications and in the context of our work may be used to illustrate the application of tilting methods to interval estimation in regression, robust statistical inference and estimation subject to constraints. The method can be viewed as 'empirical likelihood with nuisance parameters'.     

石油亚砜PSO—Ⅱ与P_(204),P_(507)萃取稀土的研究

分别用P_(204),P_(507),PSO—Ⅱ单独萃取混合氯化稀土,得到了萃取稀土的最佳条件,并对P_(204)与PSO—Ⅱ、P_(507)与PSO—Ⅱ,协同萃取稀土元素进行了初步探讨,发现P_(204)与PSO—Ⅱ,P_(507)与PSO—Ⅱ两者在萃取混合氯化稀土的试验条件下,均无协同效应。     

The repeated public goods game: A solution using Tit-for-Tat and the Lindahl point

This paper demonstrates how a repeated public goods problem may be solved by using Tit-for-Tat (TFT) on the Lindahl point. The general solution is developed; geometric and numerical examples are offered.I wish to thank an anonymous reviewer for very helpful comments on earlier drafts of this paper.     

古代突厥语民族的民间竞技与游戏——以《突厥语大词典》和《福乐智慧》为例

文章主要收集了《突厥语大词典》和《福乐智慧》中的民间竞技与游戏的语言材料,通过古代突厥语民族的赛马、射箭、马球、达瓦孜、投掷等体育竞技与游戏,试图再现他们当时的社会生活概貌。     

新课程改革理念下政治课“自主、合作、探究”学习模式初探

新课程提倡“自主、合作、探究”学习。首先论述目前对“自主、合作、探究”学习教学模式存在的误解,然后本人就新课程提倡“自主、合作、探究”学习的理解和实践经验做了简述。