Multiobjective Stochastic Multivariate Stratified Sampling in Presence of Nonresponse

The case of nonresponse in multivariate stratified sampling survey was first introduced by Hansen and Hurwitz in 1946 considering the sampling variances and costs to be deterministic. However, in real life situations sampling variance and cost are often random (stochastic) and have probability distributions. In this article, we have formulated the multivariate stratified sampling in the presence of nonresponse with random sampling variances and costs as a multiobjective stochastic programming problem. Here, the sampling variance and costs are considered random and converted into a deterministic NLPP by using chance constraint and modified E-model. A solution procedure using three different approaches are adopted viz. goal programming, fuzzy programming, and D₁ distance method to obtain the compromise allocation for the formulated problem. An empirical study has also been provided to illustrate the computational details.     

方差分量模型非负二次同时估计可容许的必要条件

给出了方差分量模型Ｙ＝ Ｘβ＋ ∑ｍｉ＝１Ｕｉεｉ ,Ｕ１ Ｕ１′＝ …＝ Ｕｍ Ｕｍ′＞ ０ 中方差分量（σ２１ ,…,σ２ｍ） 的非负二次同时估计（ Ｙ′Ａ１ Ｙ,…,Ｙ′ＡｍＹ） 可容许的一个必要条件．     

SPECIAL ISSUE： MIGRANT WORKERS IN THE COURSE OF URBANIZATOIN The social distance between urban residents and migrant workers： an institutional analysis

数据分析显示,市民最喜欢的职业主要是市民就业比较集中的行业,如成为行政机关干部、教师和科研人员;市民最不喜欢的职业主要是农民工就业比较集中的行业,如建筑业、饭店服务业等。市民与农民工社会距离的类型以中、远距离为主。在社会距离的评价上存在一定程度的非对称性。社会地位差异、文化差异、空间隔离和非正式制度对社会距离有很大影响。市民与农民工的社会距离有不断缩小的趋势,两大群体之间已经出现了一定程度的社会融合。     

Testing homogeneity in discrete mixtures

This paper introduces W-tests for assessing homogeneity in mixtures of discrete probability distributions. A W-test statistic depends on the data solely through parameter estimators and, if a penalized maximum likelihood estimation framework is used, has a tractable asymptotic distribution under the null hypothesis of homogeneity. The large-sample critical values are quantiles of a chi-square distribution multiplied by an estimable constant for which we provide an explicit formula. In particular, the estimation of large-sample critical values does not involve simulation experiments or random field theory. We demonstrate that W-tests are generally competitive with a benchmark test in terms of power to detect heterogeneity. Moreover, in many situations, the large-sample critical values can be used even with small to moderate sample sizes. The main implementation issue (selection of an underlying measure) is thoroughly addressed, and we explain why W-tests are well-suited to problems involving large and online data sets. Application of a W-test is illustrated with an epidemiological data set.     

英汉远近指示词的语篇衔接功能对比分析

英汉远近称指示词在指示照应的语篇衔接方面具有主观性,同时英汉认知方式和语言形式的不同,造成了其对心理距离远近确定的不同,从而导致了汉语远近称指示词在指称心理距离方面使用范围较广,频率较高。     

关于线性切换系统的共同Lyapunov函数

研究了离散和连续线性切换系统的共同二次Lyapunov函数.对于系统矩阵为分块上三角或分块下三角矩阵的两种情形,给出了一些关于共同二次Lyapunov函数的性质.     

“项目教学法”在现代远程计算机教学中的研究

在现代远程课程教学中运用“项目教学法”,能以学生自主探索为基础,充分运用和发挥现代远程教育的优势,实现教学在时间和空间上的扩充与延伸,实现学生远程自主学习。同时,促进学生综合素质的培养与提高。     

论现代远程教育中教师的角色定位

在现代远程教育中,学生和教师之间处于分离状态,学生以个别化自主学习为主。相对传统教学,教师的角色发生了转变,由知识的讲授者转变为学生学习的参与者、指导者;由教学支配者、控制者转变为学生学习的组织者、促进者;由静态知识的占有者转变为动态知识的研究者。面对这种趋势,教师应该在熟练运用各种现代教育技术手段提高自身业务素养的同时,努力调适自己以适应现代远程教学的需要。     

论当代资本与文化的关系

资本的特性在于增殖,文化的本质和使命在于塑造和提升人类的心智及其精神世界;文化应与资本保持适当的批判距离,以保持自己的本性．但随着经济全球化和资本逻辑的扩张,资本不断入侵到文化领域。当代文化的一个突出特点就是文化在资本增殖和经济发展中越来越成为一个关键性的因素．社会主义文化建设中,如何防止资本扩张逻辑对文化的过度入侵,是当代中国社会主义文化建设中一个必须重视的问题。     

Fast algorithms for computing the tripartition-based distance between phylogenetic networks

Consider two phylogenetic networks and ’ of size n. The tripartition-based distance finds the proportion of tripartitions which are not shared by and ’. This distance is proposed by Moret et al. (2004) and is a generalization of Robinson-Foulds distance, which is orginally used to compare two phylogenetic trees. This paper gives an -time algorithm to compute this distance, where h is the number of hybrid nodes in and ’ while k is the maximum number of hybrid nodes among all biconnected components in and ’. Note that $k \ll h \ll n$ in a phylogenetic network. In addition, we propose algorithms for comparing galled-trees, which are an important, biological meaningful special case of phylogenetic network. We give an $O(n)$-time algorithm for comparing two galled-trees. We also give an -time algorithm for comparing a galled-tree with another general network, where h and k are the number of hybrid nodes in the latter network and its biggest biconnected component respectively.