基于消费者生活方式视角的中国保健品市场的分类研究

本文通过问卷调查,对调研数据进行统计分析,提取了科技工作者生活方式的九大维度,即健康意识因子、社会交往因子、家庭关爱因子、工作压力因子、时尚因子、刻板因子、冲动因子、实用因子、从众因子等;并在此基础上将科技工作者划分为六大群体,即时尚经济型、固执自我型、传统居家型、工作狂型、时尚社交型和健康敏感型等。结果显示,每个生活方式群体有各自的特征,对保健品的消费行为也存在明显差异,这表明生活方式与保健品消费行为之间存在密切关系。最后本文对保健品企业提出了相应的营销建议。     

被湮没的历史:程颐的学制改革思想研究

北宋中期,王安石在宋神宗的支持下对太学进行了系统的改革,改革带动了太学的发展,但也产生了不利影响,太学生人数过多而人才质量不佳,太学教师出于自保而懈怠教学。于是在以司马光为首的党派当政之后,就开始全面批判王安石的太学改革措施。程颐作为司马光的追随者,在任崇政殿说书期间,针对太学条例提出了自己的构想,他主张减少太学生名额并提高学生住宿待遇,强调太学教师应该参与学生管理,并提出严格律学的入学资格,调整武学的学习内容,增强对儒家经典的学习。然而程颐的学制改革只是停留在理论层面,并没有得以实践。     

中国特色城镇化:学术内涵、实践探索和理论认识

本文回顾了中国特色城镇化的学术起源,并给出了一般性的界定;结合城镇化的实践探索,诠释了中国特色城镇化的独特内涵,即中国特色城镇化是外生与内生的统一,具有渐进性、多样性、协调性和人本性.中国特色城镇化不同于其他国家的发展模式,促使我们反思如何正确认识和处理政府与市场关系、府际关系、产城关系.     

论公权力的不当行使对政治认同的损害及其修复——基于社会公正视角的分析

社会公正作为人们孜孜以求的一种价值目标,它不仅是社会成员获得社会尊重感和群体归属感的基础,也是政治体系粘合社会成员、建构政治认同与获取政治合法性的重要资源.在我国改革开放的进程中,由公权力的不当行使而引发的社会不公表现得越来越为明显且已经成为消解政治认同、引发社会矛盾、刺激民众抗争和制造社会不稳定的威胁之一.因此,如何通过相关制度的建构与完善来规范公共权力的行使不仅成为实现社会公正和增强人们政治认同感的有效途径,而且也成为维护社会稳定、推动和谐社会建设与实现中国梦的重要保障.     

董事会自由裁量权与公司绩效的实证研究

自由裁量权是指管理层能够在多大程度上掌控其赖以生存的环境。为研究董事会自由裁量权是否引发公司绩效的变化,以2011年沪、深A股上市公司数据为样本,采样因子分析进行效度检验,并通过曲线回归进行实证分析,发现董事会自由裁量权对公司绩效的影响程度。得出结论为:董事会自由裁量权对公司绩效的影响成倒U型关系。     

Feature screening in ultrahigh-dimensional additive Cox model

The additive Cox model is flexible and powerful for modelling the dynamic changes of regression coefficients in the survival analysis. This paper is concerned with feature screening for the additive Cox model with ultrahigh-dimensional covariates. The proposed screening procedure can effectively identify active predictors. That is, with probability tending to one, the selected variable set includes the actual active predictors. In order to carry out the proposed procedure, we propose an effective algorithm and establish the ascent property of the proposed algorithm. We further prove that the proposed procedure possesses the sure screening property. Furthermore, we examine the finite sample performance of the proposed procedure via Monte Carlo simulations, and illustrate the proposed procedure by a real data example.     

Analysis of dependently truncated data in Cox framework

Truncation is a known feature of bone marrow transplant (BMT) registry data, for which the survival time of a leukemia patient is left truncated by the waiting time to transplant. It was recently noted that a longer waiting time was linked to poorer survival. A straightforward solution is a Cox model on the survival time with the waiting time as both truncation variable and covariate. The Cox model should also include other recognized risk factors as covariates. In this article, we focus on estimating the distribution function of waiting time and the probability of selection under the aforementioned Cox model.     

Estimation of the cumulative incidence function under multiple dependent and independent censoring mechanisms

Competing risks occur in a time-to-event analysis in which a patient can experience one of several types of events. Traditional methods for handling competing risks data presuppose one censoring process, which is assumed to be independent. In a controlled clinical trial, censoring can occur for several reasons: some independent, others dependent. We propose an estimator of the cumulative incidence function in the presence of both independent and dependent censoring mechanisms. We rely on semi-parametric theory to derive an augmented inverse probability of censoring weighted (AIPCW) estimator. We demonstrate the efficiency gained when using the AIPCW estimator compared to a non-augmented estimator via simulations. We then apply our method to evaluate the safety and efficacy of three anti-HIV regimens in a randomized trial conducted by the AIDS Clinical Trial Group, ACTG A5095.     

An additive–multiplicative mean model for panel count data with dependent observation and dropout processes

This paper discusses regression analysis of panel count data with dependent observation and dropout processes. For the problem, a general mean model is presented that can allow both additive and multiplicative effects of covariates on the underlying point process. In addition, the proportional rates model and the accelerated failure time model are employed to describe possible covariate effects on the observation process and the dropout or follow‐up process, respectively. For estimation of regression parameters, some estimating equation‐based procedures are developed and the asymptotic properties of the proposed estimators are established. In addition, a resampling approach is proposed for estimating a covariance matrix of the proposed estimator and a model checking procedure is also provided. Results from an extensive simulation study indicate that the proposed methodology works well for practical situations, and it is applied to a motivating set of real data.