Exact Inference for a Population Proportion Based on a Ranked Set Sample

ABSTRACT

This article develops and investigates a confidence interval and hypothesis testing procedure for a population proportion based on a ranked set sample (RSS). The inference is exact, in the sense that it is based on the exact distribution of the total number of successes observed in the RSS. Furthermore, this distribution can be readily computed with the well-known and freely available R statistical software package. A data example that illustrates the methodology is presented. In addition, the properties of the inference procedures are compared with their simple random sample (SRS) counterparts. In regards to expected lengths of confidence intervals and the power of tests, the RSS inference procedures are superior to the SRS methods.     

Systematically misclassified binary dependent variables

ABSTRACT

When a binary dependent variable is misclassified, that is, recorded in the category other than where it really belongs, probit and logit estimates are biased and inconsistent. In some cases, the probability of misclassification may vary systematically with covariates, and thus be endogenous. In this paper, we develop an estimation approach that corrects for endogenous misclassification, validate our approach using a simulation study, and apply it to the analysis of a treatment program designed to improve family dynamics. Our results show that endogenous misclassification could lead to potentially incorrect conclusions unless corrected using an appropriate technique.     

基于CPI分项目价格指数的中国核心通货膨胀估计及政策选择研究

 核心通货膨胀是观测到的通货膨胀中长期的、持续的成分。核心通货膨胀对经济形势的判断与宏观经济政策的制定有着重要的意义。本文使用CPI分项目价格指数建立动态因子指数（DFI）模型估计了2001年1月至2011年4月中国的核心通货膨胀。结果显示,我们估计的核心通货膨胀反映了通货膨胀的趋势,能够很好地反映货币供给的变化,对未来5-19个月的CPI亦有较好的预测能力。     

企业虚拟经营问题研究

企业虚拟经营是20世纪90年代以来产生的一种全新经营管理模式,它以特有的运营机制和竞争优势使很多企业在经营管理实践中获得成功.虚拟经营的管理模式并不是每个企业都要应用,关键是它的管理理念值得我们借鉴和学习,因为它代表着企业共同合作和竞争的发展趋势.     

A note on the permutationally convex games

If marginal worth vector of a game for an ordering is in the core, the game does not have to be a p.c. game.     

办学报不能跟着“核心”转——兼谈所谓“核心期刊”现象

针对期刊界盛行的所谓"核心期刊"现象进行了剖析,认为这种现象之所以盛行,最根本原因是缺乏科学的学术评价和期刊评价机制及体系,当然也与有些科研管理、职称评审部门种种简单化的、从某种意义上说也是不负责任的学术评价做法密切相关.主张办学报不能跟着"核心"转,而应在办出特色方面下功夫、做文章.     

On Core Sorting in RMTS and RMTO Systems: A Newsvendor Framework

Variation in core condition and uncertainty in market demand pose great challenges for remanufacturers to match supply with demand. This article investigates a firm that acquires and remanufactures cores of multiple quality conditions to satisfy demand. Both remanufacturing‐to‐stock (RMTS) and remanufacturing‐to‐order (RMTO) systems are considered. In each system, a sorting operation that resolves the core conditions before remanufacturing may or may not be adopted, leading to four possible sorting/remanufacturing strategies: (1) no sorting in RMTS; (2) sorting in RMTS; (3) no sorting in RMTO; and (4) sorting in RMTO. Under each strategy, we derive the optimal decisions on the acquisition and remanufacturing quantities, in two scenarios, respectively: (i) all acquired cores are remanufacturable and (ii) some cores are non‐remanufacturable. We find that sorting can be completely useless to RMTS system, and thus should never be adopted regardless of the sorting cost. We provide the analytical condition under which this ineffectiveness of sorting occurs. Nevertheless, sorting is always useful to RMTO system and should be adopted when the sorting cost is below a threshold value. We also conduct an extensive numerical study and show that the effects of sorting to RMTO system are more significant than that to RMTS system.     

社会主义核心价值观与优秀传统文化传承与创新研究

众所周知,优秀传统文化可谓是华夏民族千百年来的文化积淀,饱含国人崇高的精神追求与思想情怀,而社会主义核心价值观则是当代国人共同理想与价值倾向的凝集,不但可视为是对迫切需要处理的社会问题的有效回应,还是和优秀传统文化的历史契合。本文对社会主义核心价值观、优秀传统文化及两者的关系进行了阐述,并对社会主义核心价值观与优秀传统文化传承与创新进行了探讨。     

基于二元翻译标准的高校校园标识语翻译

通过结合二元翻译标准和当下校园公共标识语翻译现状,提出解决高校公共标识语翻译弊病的方案。     

Asymptotic hypothesis test to compare likelihood ratios of multiple diagnostic tests in unpaired designs

The accuracy of a binary diagnostic test is usually measured in terms of its sensitivity and its specificity. Other measures of the performance of a diagnostic test are the positive and negative likelihood ratios, which quantify the increase in knowledge about the presence of the disease through the application of a diagnostic test, and which depend on the sensitivity and specificity of the diagnostic test. In this article, we construct an asymptotic hypothesis test to simultaneously compare the positive and negative likelihood ratios of two or more diagnostic tests in unpaired designs. The hypothesis test is based on the logarithmic transformation of the likelihood ratios and on the chi-square distribution. Simulation experiments have been carried out to study the type I error and the power of the constructed hypothesis test when comparing two and three binary diagnostic tests. The method has been extended to the case of multiple multi-level diagnostic tests.