Asymptotic bias in the linear mixed effects model under non-ignorable missing data mechanisms

Summary.  In longitudinal studies, missingness of data is often an unavoidable problem. Estimators from the linear mixed effects model assume that missing data are missing at random. However, estimators are biased when this assumption is not met. In the paper, theoretical results for the asymptotic bias are established under non-ignorable drop-out, drop-in and other missing data patterns. The asymptotic bias is large when the drop-out subjects have only one or no observation, especially for slope-related parameters of the linear mixed effects model. In the drop-in case, intercept-related parameter estimators show substantial asymptotic bias when subjects enter late in the study. Eight other missing data patterns are considered and these produce asymptotic biases of a variety of magnitudes.     

关于在高校开设学习训练课的构想

由应试教育向素质教育转变是提高人才培养质量的必由之路 ,学生学习能力的培养是综合素质培养的一个非常重要的方面。文中提出在高校开设学习训练课是系统培养学生学习能力的有效途径 ,并就在高校开设学习训练课的必要性、课程内容安排、教学目标、课程建设等方面谈了自己的见解。     

文艺美学的人学方向——论马克思主义美学的当代建构

马克思主义文艺美学蕴涵浓厚的人学精神,马克思恩格斯的美学理想突出表达了对人的关怀和对人的精神重塑的期盼,马克思主义文艺观因而具有旺盛的历史活力。在文艺美学的当代建构中,我们应当把握好学科建设的方向,坚持理论的务实品格,在关注人生、贴近审美实践中寻找新的学术生长点。     

金陵来取贤良士,岭表诸贤尽选抡--洪武荐举制度与诗文研究(上)

朱元璋统治期间 ,多次实施荐举制度。荐举制度的实行为文人聚会京师提供了契机 ,在一定程度上促进了文人诗文创作的提高 ,并且造成文人群中“组诗”的大量出现。同时荐举制度在诗文理论方面也产生了一定的效应     

晋文公灭国夺邑系年辑证——西周末年至春秋时期晋灭国夺邑系年辑证之四

晋文公二年 (前 63 5年 ) ,晋侵伐、迁徙阳樊、原二国 ,取苏之温、州、陉、四邑 ,又取周之组、茅二邑 ;晋文公五年 (前 63 2年 ) ,取卫之五鹿     

Can we remember differently? A case study of the new culture of memory in voluntary organisations

This article analyses the positive contribution that Slovenian voluntary, non–governmental organisations, users' organisations and community–based services in the field of mental health have made to the 'new culture of memory' of helpers and users. The conceptual differences between Slovenian psychiatric (institutional) treatment and voluntary community care are presented through the case study of Clare, a young woman who was diagnosed as a chronic schizophrenic. This example shows the importance of community care in voluntary organisations for the reduction of disability associated with mental disorders. The development of the new culture of memory in voluntary organisations and community–based services is not only the 'narrative turn' within social welfare, but also symbolises the 'implicit turn' in the relationship between the helper and the user. The real challenge of the new culture of memory in the process of help to disabled people (in respect of individuals working through traumatic memories) is that the helper can bear and support the user on a daily basis. During the process of their relationship, the deep implicit relational memories of both become activated and influence the change within the user as well as the helper.     

"祝颂"言语行为的汉英对比

汉英“祝颂”言语行为及“祝颂语”在词汇、句法、语体、语境、话语结构和文化背景等方面均存在共性与差异。实施“祝颂”言语行为时常出现“语用语言失误”和“社交语用失误” ,其根源在于文化差异 ,即英美文化的基督教信仰、个体主义、自我价值和汉文化的贬己尊人等传统观念之间的差异。     

产学研一体化与科教兴黔

本文在全面诠释产学研一体化含义及其运作模式的基础上。引入协同发展理论,对如何通过推动贵州产学研一体化进而实现科教兴黔战略目标,进行了理论分析,并提出了相应的对策措施。     

小经拼写体系及其流派初探

小经是我国回、东乡、撒拉等民族创造的一种拼音文字,用来拼写汉语、东乡语、撒拉语等。通过调查发现,这种拼音文字流行于今天的甘肃、青海、宁夏、河南、云南、新疆、陕西、内蒙古等省自治区。小经的拼写和阿拉伯文、波斯文的拼写基本相似,但略有损益,即拼写字母本身不显现读音,而是通过音标符号来体现读音。该文对小经相关文献、拼读规则、历史发展、流派加以考察和分析。     

刘少奇两种教育制度思想发展的内在逻辑——以天津半工半读教育发展为参照

学术界对刘少奇的两种教育制度思想已从多方面进行了研究 ,取得很多成果。但对他的两种教育制度思想深化发展的内在逻辑却研究不足。文章以当时刘少奇非常关心的天津半工半读教育发展为参照 ,从天津半工半读教育发展与刘少奇两种教育制度思想发展变化的互动关系中 ,探求刘少奇的两种教育制度思想发展的内在逻辑