Identifying Aberrant Data in Structural Equation Models With IRLS-ADF

In structural equation models, outliers could result in inaccurate parameter estimates and misleading fit statistics when using traditional methods. To robustly estimate structural equation models, iteratively reweighted least squares (IRLS; Yuan & Bentler, 2000) has been proposed, but not thoroughly examined. We explore the large-sample properties of IRLS and its effect on parameter recovery, model fit, and aberrant data identification. A parametric bootstrap technique is proposed to determine the tuning parameters of IRLS, which results in improved Type I error rates in aberrant data identification, for data sets generated from homogenous populations. Scenarios concerning (a) simulated data, (b) contaminated data, and (c) a real data set are studied. Results indicate good parameter recovery, model fit, and aberrant data identification when noisy observations are drawn from a real data set, but lackluster parameter recovery and identification of aberrant data when the noise is parametrically structured. Practical implications and further research are discussed.     

师范院校应注重学生信息能力的培养

师范生信息能力的培养是实现国家教育信息化政策的必然要求.培养师范生的信息能力:要树立现代师范教育理念,重视师范院校教师信息能力的培养,创造良好的信息技术环境,增加信息技术课程.     

江苏省企业经营者能力分析

经营者队伍基本情况 1 男性占绝对优势 根据抽样问卷,江苏省男性企业经营者占绝大多数。从性别分布看,江苏省企业经营者中男性占86.2％,女性只占12.4％,男性在企业经营者中仍处于绝对优势的地位。 2 年龄以36-55岁为主 江苏省企业经营者队伍中,年龄在36-55岁的企业经营者占总数的比例达到86.7％,35岁以下的仅占8.2％,55岁以上的也仅占5％。     

“汉诺塔问题”初探

对“汉诺塔问题”的最少移动次数及实现最少移动次数的方案数量进行了研究,并证明了实现最少移动次数的方案是唯一的．     

打破传统用稿格局提升学报学术质量

高校学报“反映本校”“服务本校”的内向性办刊宗旨，使其用稿格局定位于：“以内稿为主，少登或尽量不登外稿”．然而，在社会主义市场经济体制下，学报面临着激烈的竞争，核心期刊以及学术界对权威检索机构的认同，也使高校学报面临着巨大的压力．在如此严峻的情势下，高校学报要求生存、谋发展，必须打破保守封闭的传统用稿格局，广辟稿源，不分内外，以质选稿，这样才能提高其学术质量，增强其竞争力．目前，国际国内形势也为学报建立开放的办刊体系提供了可能．     

Science education through informal education

To develop the pedagogic efficiency of informal education in science teaching, promoting a close cooperation between institutions is suggested by Monteiro, Janerine, de Carvalho, and Martins. In their article, they point out effective examples of how teachers and educators work together to develop programs and activities at informal education places such as science museums. Their study explored and discussed the viability and relevancy of school visits to museums and possibilities to enhance the connection between students’ visits in informal contexts and their learning in schools. Given that students learn science by crossing the boundaries of formal and informal learning contexts, it is critical to examine ways of integrated and collaborative approach to develop scientific literacy to help students think, act and communicate as members of problem solving communities. In this forum, we suggest the importance of students’ lifeworld contexts in informal learning places as continuum of Monteiro, Janerine, de Carvalho, and Martins’ discussion on enhancing the effectiveness of informal learning places in science education.     

The Meaning of Social Inclusion for People with Disabilities in South Korea

This study sets out to examine and understand the meaning of social inclusion for people with disabilities, as constructed by people with disabilities themselves. Focus group interviews with 34 people who have physical impairments, cerebral palsy, or hearing or visual impairments were conducted for the study. Using the data obtained from these interviews, the interviewees’ various definitions and perceptions of social inclusion were analysed and four meaning categories for social inclusion were identified: excluded/segregated, present, participating, and actively participating. The findings of this research can be used as foundational material in the development of disability policies and the improvement of social services to better enable full social participation and social inclusion for people with disabilities.     

我国道路交通事故损害赔偿归责原则初探

道路交通事故归责原则是道路交通事故损害赔偿体系的重要内容。在我国，由于相关的法律法规过于简单，对道路交通事故适用何种原则，理论界争议较大，在实践中也存在很多问题。文章提出了针对不同类别的交通事故，应采用不同的归责原则，并结合其他国家的做法对我国国情进行分析；文章还提出，在适用无过错责任原则时要注意适用好过失相抵规则，并呼吁尽快完善道路交通事故社会救助基金，以确保受害者的合法权益。     

球面三角形在航天器交会机动中的应用

介绍了基于球面三角形求解机动时间和方位角的航天器交会运动学模型,并通过计算证明方法的可行性,这类机动不受时间约束,是多冲量交会机动的崭新思路.     

Gradual acquisition of visual discrimination tasks in a social group of rhesus monkeys (Macaca mulatta)

An established, captive colony of 74 rhesus monkeys (Macaca mulatta) was group-tested on a simultaneous visual discrimination problem and three reversals of the initial discrimination. The task incorporated important aspects of rhesus foraging behavior. Although other studies of communal groups of nonhuman primates have reported rapid learning, subjects in the present study showed no evidence of one-trial acquisition of the initial problem or of rapid learning-set formation across the reversal series. Instead, mean and individual performance, on all variables measured, improved gradually, both within and across series. Subjects appeared to “learn how to learn,” consistent with findings of traditional studies of individual discrimination learning. Our finding of gradual learning in group-living animals argues that the source of rapid learning in previous reports is not attributable to social influence or ecological relevance, but may reflect specific procedural or species differences between studies.