Some concepts of mult1variate dependence

Several types of positive dependence are shown to be equiv-alent to the concept of a distribution with a density which is TP₂ in pairs. Among these is the concept of m^?-positive depend-ence of Alam and Wallenius. Using this result, all relationships among many of the most important concepts of positive dependence are determined. Furthermore, an application of the equivalences of these types of positive dependence yields a results of Ahmed, Langberg, Leon and Proschan.     

A note on positive dependence im multivariate distributioms

I counterexample is presented to the result by Alam and Malleolus asserting that if Y is stochastically increasing in a random vector X, then Y is stochastically increasing in a subvector of X. Their result concerning m*-positive dependence, whose proof relies on the erroneous result, is still true.     

Concomitants in a Sequence of Independent Nonidentically Distributed Random Vectors

ABSTRACT

Concomitants of order statistics are considered for the situation in which the random vectors (X ₁, Y ₁), (X ₂, Y ₂),…, (X _n , Y _n ) are independent but otherwise arbitrarily distributed. The joint and marginal distributions of the concomitants of order statistics and stochastic comparisons among the concomitants of order statistics are studied in this situation.     

Asymptotic Distributions of Quasi‐Maximum Likelihood Estimators for Spatial Autoregressive Models

This paper investigates asymptotic properties of the maximum likelihood estimator and the quasi‐maximum likelihood estimator for the spatial autoregressive model. The rates of convergence of those estimators may depend on some general features of the spatial weights matrix of the model. It is important to make the distinction with different spatial scenarios. Under the scenario that each unit will be influenced by only a few neighboring units, the estimators may have ‐rate of convergence and be asymptotically normal. When each unit can be influenced by many neighbors, irregularity of the information matrix may occur and various components of the estimators may have different rates of convergence.     

略论加强对第三批录取本科生的教学管理

自普通高等院校全国招生考试不断扩招以来,各个高校都相应做出政策调整,本文针对第三批录取本科生教学管理,就如何在降低入学门槛的情况下,构建有利于培养学生健全个性的平民教育和大众教育的实践教学体系,探讨如何适应社会需要并使之学而有成而尝试的点滴举措。     

国防生入学动机现状及招生对策

经过十年的努力,国防生这个新兴群体的教育培养和管理机制已初步形成,毕业国防生也成为了国防后备力量的重要组成部分。但不可否认的是,国防生培养工作还存在生源不足、生源质量不高等问题。造成这些问题的原因是多方面的,其中入学动机的偏差是主要原因之一,这已成为制约国防生发展的重要因素。为提高国防生生源数量和质量,应充分发挥各高校选培办的主观能动性,加大招生宣传的力度和广度,完善各种政策,采取切实可行的措施,端正国防生的入学动机,把优质生源选拔到国防生队伍中来。     

Unanticipated Educational Consequences of a Positive Parent‐Child Relationship

If today there exists a single transcendent idea about the family‐school connection, it is that a positive parent‐child relationship improves children's chances of succeeding in school. However, using data from the Texas Higher Education Opportunity Project (N = 5,836), we demonstrate that, although positive parent‐child relations are associated with better academic achievement in high school, they also are associated with an increased desire to live at home during college, which in turn decreases students' chances of enrolling in a 4‐year college. Furthermore, we replicated some of these associations using the National Longitudinal Study of Adolescent Health (N = 10,120), demonstrating that positive family dynamics can influence educational outcomes in potentially divergent and unanticipated directions.     

乡村振兴背景下农业产业化对农民收入的影响研究 ——基于S省M县调研数据

乡村振兴战略的提出为顺利解决农业经济发展问题、促进农业产业化进程和解决农民收入问题提供了政策参考的蓝本,也促使农业产业化成为解决农民增收问题的主要落脚点。该研究从农业产业化前、中、后期三阶段出发,综合考虑农民个人禀赋、政府政策、是否参加合作社及产后重点项目等维度,构建了农业产业化改善农民增收问题的理论框架,利用调研数据和二元logistic模型进行实证研究。结果表明：农业产业化能显著改善农民收入问题。作为农业产业化的典型代表,合作社在增加农民收入方面发挥着显著的积极作用,尤其是参与合作社产后重点项目这一农业产业化深化行为,更会促使农民增收。相对而言,文化程度较高、有技能、风险承受能力较强的农民收入增加的可能性较高。     

高校自主招生十年回顾与反思

高校开展自主招生试点至今已有十个年头,十年间,招生规模不断扩大、招生特点初步显现、利弊得失众说纷纭、焦点问题备受关注。未来,高校自主招生要强化监管体制、推进招考分离、优化考试内容、改革录取方式、加强配套建设。