Robust inference for estimating equations with nonignorably missing data based on SIR algorithm

Nonresponse is a very common phenomenon in survey sampling. Nonignorable nonresponse – that is, a response mechanism that depends on the values of the variable having nonresponse – is the most difficult type of nonresponse to handle. This article develops a robust estimation approach to estimating equations (EEs) by incorporating the modelling of nonignorably missing data, the generalized method of moments (GMM) method and the imputation of EEs via the observed data rather than the imputed missing values when some responses are subject to nonignorably missingness. Based on a particular semiparametric logistic model for nonignorable missing response, this paper proposes the modified EEs to calculate the conditional expectation under nonignorably missing data. We can apply the GMM to infer the parameters. The advantage of our method is that it replaces the non-parametric kernel-smoothing with a parametric sampling importance resampling (SIR) procedure to avoid nonparametric kernel-smoothing problems with high dimensional covariates. The proposed method is shown to be more robust than some current approaches by the simulations.     

Hard thresholding regression

In this paper, we propose the hard thresholding regression (HTR) for estimating high‐dimensional sparse linear regression models. HTR uses a two‐stage convex algorithm to approximate the ?₀‐penalized regression: The first stage calculates a coarse initial estimator, and the second stage identifies the oracle estimator by borrowing information from the first one. Theoretically, the HTR estimator achieves the strong oracle property over a wide range of regularization parameters. Numerical examples and a real data example lend further support to our proposed methodology.     

The Importance of Racial Socialization: School‐Based Racial Discrimination and Racial Identity Among African American Adolescent Boys and Girls

This study examined various parental racial socialization messages as mediators between school‐based racial discrimination and racial identity formation over 4 years for African American boys (N = 639) and African American girls (N = 711). Findings indicated that school‐based racial discrimination was associated with racial identity beliefs. For African American boys, behavioral racial socialization messages mediated the relation between school‐based racial discrimination and racial centrality over time. Mediation also resulted for African American girls, but for a different set of race‐related messages (negative messages and racial barriers) and racial identity beliefs. The developmental significance of the findings and implications for future research are discussed.     

知识社会个人知识管理的方法及运用

个人知识管理有利于培养良好的知识收集、整理、应用习惯,有利于提高个人的工作绩效。个人知识管理的方法有信息技术检索、评估、组织、分析等。架构于个人知识三维情报网和个人知识管理体系,以实施个人知识管理。     

北京对外贸易积极应对国外TBT的措施探究

TBT(技术性贸易壁垒)目前严重影响我国产品出口,首都北京的外贸企业也遭遇TBT,形势严峻。为促进北京市对外贸易的可持续发展,探究北京对外贸易应对国外TBT的措施,可分别从企业、政府、行业协会等多角度提出相应的积极对策。     

典权的死亡与再生——兼与张新宝教授商榷

“典权废除论”往往从典权所谓的固有缺陷出发来论证典权制度的没落和消亡,没有看到这一问题的实质不是典权制度先天的不足或者缺陷,而是本土制度在西风东渐的立法体例下,如何很好衔接和融合的问题。由于典权具有相当的特殊性,试图用国外的理论来解释或者纳入其体系之下,总会显得生搬硬套与牵强附会,我们肯定典权在现有物权理论和立法实践中的困难,也考虑到现实的需要和可能,提出在商事特别法的方式下对这一古老制度进行发展和完善。     

一类具有时滞的神经网络的稳定性分析

对具有广泛应用价值的时滞Ｈｏｐｆｉｅｌｄ神经网络系统,建立了系统平衡点存在唯一的充要条件,利用常数交易法并结合不等式分析技巧讨论了神经网络模型的全局指数稳定性,获得了系统的平衡点全局指数稳定的充分条件。     

会话幽默的心理机制和认知基础

本文首先分析了会话幽默中降格和升格两种心理预设机制 ,进而从语言变异的角度举例说明了其最为常见的语言表现形式 ,最后从范畴化和概念化的角度分析了会话幽默的认知基础     

大学生政治社会化的有效途径——从思维风格与教学风格偏好关系角度研究

目前大学生政治社会化面临着许多障碍,大学生政治社会化研究亟需相关学科的加入。当代大学生政治社会化正规有效的途径主要是在学校,所以高校的思想政治理论课的教学对学生的政治社会化起着举足轻重的作用。文章从思维风格的角度把思维风格与教学风格偏好关系的实证研究结果运用到高校的思想政治理论课的教学实践中,为探索大学生政治社会化有效途径提供了理论和实践参考。     

"资本"的一种非经济学解读--布迪厄"文化资本"概念

"文化资本"是布迪厄从象征支配角度对马克思的资本理论进行非经济学解读之后提出的一个重要的社会学概念.布迪厄指出"文化资本"和经济资本一样,也可以投资于各种市场并获取相应的回报.由于"文化资本"的再生产主要是以一种"继承"方式进行的,所以它同样凝结着社会成员之间的不平等关系并体现着社会资源的不平等分配.