Evaluating Item Discrimination Power of WHOQOL-BREF from an Item Response Model Perspectives

Quality of life (QOL) has become an important component of health. By using the methodology of psychometric theory, we examine the item properties of the WHOQOL-BRIEF. Samejima’s graded response model with natural metrics of the logistic response function was fitted. The results showed items with negative natures were less discriminating. Items written in a specific way were more suitable to assess certain subgroups. The national items showed variation in discriminatory power. Questions measuring objective and specific issues performed worse than items assessing general aspects of the QOL.     

Model based labeling for mixture models

Label switching is one of the fundamental problems for Bayesian mixture model analysis. Due to the permutation invariance of the mixture posterior, we can consider that the posterior of a m-component mixture model is a mixture distribution with m! symmetric components and therefore the object of labeling is to recover one of the components. In order to do labeling, we propose to first fit a symmetric m!-component mixture model to the Markov chain Monte Carlo (MCMC) samples and then choose the label for each sample by maximizing the corresponding classification probabilities, which are the probabilities of all possible labels for each sample. Both parametric and semi-parametric ways are proposed to fit the symmetric mixture model for the posterior. Compared to the existing labeling methods, our proposed method aims to approximate the posterior directly and provides the labeling probabilities for all possible labels and thus has a model explanation and theoretical support. In addition, we introduce a situation in which the “ideally” labeled samples are available and thus can be used to compare different labeling methods. We demonstrate the success of our new method in dealing with the label switching problem using two examples.     

建构主义对国际关系理论发展的影响

建构主义作为一种后现代理论,研究主体与客体的关系,其思想渊源可追溯到古希腊.建构主义的基本观点是:物质客观存在,但物质的意义是观念赋予的.建构主义理论的嵌入动摇了国际关系理论的逻辑起点,引发人们对国际关系理论的哲学思考.观念至上与物质至上两种主义之争有助于国际关系理论的全面发展.     

近年来中国近代社会演迁研究的学术反思

近30年来,关于中国近代社会演迁问题的学术研究经历了从西方中心论到中国中心的转变,随之而来的争论是中国近代社会演迁的动力与机制是否来源于传统时代向近代的转移?在社会演迁过程中官方与民间各自发挥了怎样的作用?是官方主导还是民间主导?传统社会形成的地域性在近代社会演迁中是否仍起作用?对近年来关于上述问题研究的简述与反思必将有助于研究的深化。     

基层司法的路径探索——论"陈燕萍工作法"中的"法官能动"

由于我国基层社会本身具有的强烈的"乡土性"与"本土性"特征,现代法律制度下的基层司法必须以更加灵活的方式将现代法律理念适用于乡土社会的法律纠纷,基层司法也因此具有了与规范式司法相差甚远的"乡土特征"."陈燕萍工作法"根据基层司法的实践情况,总结出个案实体优先、法官主动调查等经验,其核心在于基层法官在司法过程中的"适度能动",对我国当前基层司法具有重要的现实指导意义.     

Functional sliced inverse regression analysis

Most of the usual multivariate methods have been extended to the context of functional data analysis. Our contribution concerns the study of sliced inverse regression (SIR) when the response variable is real but the regressor is a function. In the first part, we show how the relevant properties of SIR remain essentially the same in the functional context under suitable conditions. Unfortunately, the estimation procedure used in the multivariate case cannot be directly transposed to the functional one. Then, we propose a solution that overcomes this difficulty and we show the consistency of the estimates of the parameters of the model.     

关系类型对服务失败后顾客反应的影响

本文探讨了真正服务关系、虚假服务关系和偶遇服务关系三种关系类型对服务失败后顾客反应的影响。研究显示,在遭遇服务失败后三种关系类型的反应差异明显,具有真正服务关系的顾客在服务失败后比其它两类关系类型的顾客具有更高的顾客满意度、更少的负面口碑以及更高的重购倾向,而虚假关系的顾客比偶遇关系的顾客又表现出较高的满意度、较少的负面口碑以及较高的重购倾向。所以关系能够提供防御性服务补救作用,而且相对于其它补救策略更显得未雨绸缪。     

企业契约理论的局限性与企业边界的重新界定

本文指出了企业契约理论在分析企业边界与规模时存在的局限性,并针对当前企业边界与规模变化的特征与趋势、企业经营策略与重心的变化与调整,从企业生产性知识积累的角度对企业的边界与规模进行了重新的界定。     

On Shortest k-Edge-Connected Steiner Networks in Metric Spaces

Given a set of points P in a metric space, let l(P) denote the ratio of lengths between the shortest k-edge-connected Steiner network and the shortest k-edge-connected spanning network on P, and let r = inf l(P) P for k 1. In this paper, we show that in any metric space, r 3/4 for k 2, and there exists a polynomial-time -approximation for the shortest k-edge-connected Steiner network, where = 2 for even k and = 2 + 4/(3k) for odd k. In the Euclidean plane, and .     

"四方"研究百年

百年(1900-1999)来学者们对"四方"(东、西、南、北)字源、词义、彼此组合构词的方式、语法功能都有所研究,只是当前要进一步拓展"四方"研究的视野,尤其是"四方"词义虚化的原因和途径、"四方"的句法功能、方言、少数民族语言、外族语言中"四方"表达方式的研究更需要加强,这些研究的加强将推动语言类型学和语言哲学的研究.