Reconstruction of the past failure times for the proportional reversed hazard rate model

The problem of reconstruction of the past failure times in the left-censored set-up is considered. Various reconstructors of time to failure of units censored in a left-censored sample from the proportional reversed hazard rate models are demonstrated. The maximum-likelihood, best unbiased and conditional median reconstructors are obtained. We also present two methods, non-Bayesian and Bayesian, for obtaining reconstruction intervals for the past failure times. Numerical example and a Monte Carlo simulation study are given to illustrate all the reconstruction methods discussed in this paper.     

农村留守妇女婚姻幸福感的影响因素——基于广东五市的数据分析

本文基于广东留守妇女专项调查数据，通过对数偶值模型的筛选发现夫妻分居的空间距离、丈夫打工后收入增减情况、住房质量、子女教育负担、老人健康负担以及夫妻交流互动情况对留守妇女的婚姻幸福感有显著影响。文章建议相关部门应创造条件就近建立企业让夫妻双方打工，这或许是解决由于分居而导致的家庭婚姻问题的较好途径。     

我国留守家庭状况的统计研究

对我国留守家庭的研究基于2000年全国人口普查0.95‰抽样数据。研究结果表明,留守家庭已经成为我国社会转型时期的重要家庭类型,其主要特征是家庭结构的变异和家庭功能的弱化。     

“周人尚左”与“右手的优越”——中国古代分类体系的人类学解释

作为原始二元分类的重要范畴,左、右在传统文化的分类体系中扮演着重要角色。周代是传统左右观形成的关键时期,＂尚左＂的周人却实行着＂右手的优越＂,同一时期集体观念与行为方式的相悖及不同历史时期左右观的无常变化在揭示出矛盾的同时,也清楚地表明了传统分类体系具有对立功能的转换、对立之间不存在必然的一致性等特征,以及设立秩序、维系平衡的功能。     

Conditional Quantile Estimation for Truncated and Associated Data

Abstract

In survival or reliability studies, it is common to have data which are not only incomplete but weakly dependent too. Random truncation and censoring are two common forms of such data when they are neither independent nor strongly mixing but rather associated. The focus of this paper is on estimating conditional distribution and conditional quantile functions for randomly left truncated data satisfying association condition. We aim at deriving strong uniform consistency rates and asymptotic normality for the estimators and thereby, extend to association case some results stated under iid and α-mixing hypotheses. The performance of the quantile function estimator is evaluated on simulated data sets.     

Clustered Survival Data with Left‐truncation

Left‐truncation occurs frequently in survival studies, and it is well known how to deal with this for univariate survival times. However, there are few results on how to estimate dependence parameters and regression effects in semiparametric models for clustered survival data with delayed entry. Surprisingly, existing methods only deal with special cases. In this paper, we clarify different kinds of left‐truncation and suggest estimators for semiparametric survival models under specific truncation schemes. The large‐sample properties of the estimators are established. Small‐sample properties are investigated via simulation studies, and the suggested estimators are used in a study of prostate cancer based on the Finnish twin cohort where a twin pair is included only if both twins were alive in 1974.     

维吾尔族的萨满教遗俗

作为原始形态的宗教萨满教,对维吾尔族的社会历史、文化风尚和心理素质等方面产生过巨大的影响,其观念及其习俗遗存至今。     

试述战后国民党当局对北平敌产的争夺

抗战胜利后,国民党当局对北平敌产施以“劫收”。其间,驻军部队、国民党中央各部会、北平市当局、河北省当局、北平行营等各系统围绕敌产出现了激烈争夺。争夺进一步助长了“劫收”之风,进而产生了严重的社会影响与政治后果,加速了国民党在大陆统治的失败。     

抗战胜利后我国公路交通规则的重大改革——车辆靠左行驶改为靠右行驶60年

中国近代交通兴起之后,公路交通中规定车辆靠左行驶。1946年1月1日,全国公路交通规则发生了一大变化,车辆统一改为靠右行驶。这一改革具有多方面的原因,国民政府为此做了许多准备工作,使这一改革取得成功。     

对背向滑步推铅球技术中左腿摆动问题的探讨

铅球投掷是一个技术性强,动作结构复杂的全身性活动的项目,它需要全身各部位的协调配合,使得人体在极短的时间内将身体各相关部位的力合理的施加于铅球上.在这其中,左腿动作(以右手投掷为例)起着决定滑步的方向、速度、重心和移动路线以及充分发挥它的效应等作用.滑步技术中常见的"跳步"和"滑步不连贯"等错误,很大程度上是由于左腿摆动不够正确造成的.因此对此问题有必要进行分析探讨.