RIM: A Random Item Mixture Model to Detect Differential Item Functioning     

Sofie Frederickx  Francis Tuerlinckx  Paul De Boeck  David Magis 《Journal of Educational Measurement》2010,47(4):432-457

In this paper we present a new methodology for detecting differential item functioning (DIF). We introduce a DIF model, called the random item mixture (RIM), that is based on a Rasch model with random item difficulties (besides the common random person abilities). In addition, a mixture model is assumed for the item difficulties such that the items may belong to one of two classes: a DIF or a non-DIF class. The crucial difference between the DIF class and the non-DIF class is that the item difficulties in the DIF class may differ according to the observed person groups while they are equal across the person groups for the items from the non-DIF class. Statistical inference for the RIM is carried out in a Bayesian framework. The performance of the RIM is evaluated using a simulation study in which it is compared with traditional procedures, like the likelihood ratio test, the Mantel-Haenszel procedure and the standardized p -DIF procedure. In this comparison, the RIM performs better than the other methods. Finally, the usefulness of the model is also demonstrated on a real life data set.  相似文献   

Patterns of journal publications by staff of the College of Medicine, University of Ibadan, Nigeria, 1961-1980     

P H Shoyinka  F D De Cola 《Bulletin of the Medical Library Association》1984,72(2):168-176

This study analyzes publishing patterns of the staff of the University of Ibadan College of Medicine, Nigeria, based on a bibliography prepared by the authors. Data-gathering for the bibliography is described. An analysis is made of journals staff published in for the period 1961-1980, focusing on changes in journal order rank, publishing locations, and subject spread. A ranked list of the leading journals for the period 1976-1980 is given, showing the importance of local publishing and pointing to the need for local indexing.  相似文献   

关于广东省普通高校体育专业招生考试足球项目考试内容、方法及评分标准的研究   总被引：1，自引：0，他引：1  

臧连明  王君  郭惠先  刘飞振  钟利卿  温建德  肖子亮 《广州体育学院学报》2004,24(6):62-65

采用调查访问、实验法对广东省普通高校体育专业招生考试足球项目考试内容、方法及评分标准进行研究,通过研究．足球非专项考试难度偏低的问题、足球专项考试方法中颠球、绕杆射门项目考试难度偏低以及踢准项目偏难等问题得到解决,从而确立了广东省新的足球专项、非专项考试的各项内容、方法及评分标准,为广东省考试中心组织实施2005年广东省普通高校体育专业招生考试提供了具有实效性和科学性的保证。  相似文献   

Quality of grey literature in the open access era: Privilege and responsibility     

Paola?De?CastroEmail author  Sandra?Salinetti 《Publishing Research Quarterly》2004,20(1):4-12

Conclusions We are living a deep change in the information transfer process involving the different actors of the editorial scene (from authors to editors, web-editors, e-publishers and readers), who occasionally play different roles at the same time (e.g., authors sometimes bypass the editor thus assuming direct responsibilities in the diffusion of documents in the Internet). Furthermore, information producers, managers or seekers often show twofold personalities like Dr. Jekyll and Mr. Hyde. They would like to find all documents free on the Internet and be able to read original, reliable, and high quality information, but they are sometimes reluctant to spread their papers through online nonofficial channels as they care for the impact factor, prestige, and career advancement. It is a revolutionary period in which new and alternative forms of scholarly communication live together with more traditional ones and the future is difficult to define. Recent initiatives of open access—such as Pubmed Central, Public Library of Science, Budapest Open Access Initiative—are contributing to define new trends in the editorial market, challenging the traditional distribution channels, mainly managed by commercial editors, and placing the authors’ role and publication copyrights under severe discussion. In this landscape, GL now has new dignity and becomes closer and closer to innovative scientific publications supported by researchers in view of a generalised movement towards open access. The nuances of grey are becoming lighter and lighter. The questions are many, the answers few, but, in any case, the ethical responsibility of producing and issuing quality documents can never be disregarded.  相似文献   

PubMed, Internet Grateful Med, and Ovid: a comparison of three MEDLINE Internet interfaces     

De Groote SL 《Medical reference services quarterly》2000,19(4):1-13

Three MEDLINE Internet interfaces are compared: PubMed, Internet Grateful Med, and Ovid MEDLINE. Although these interfaces all search MEDLINE, significant differences exist in terms of their search interfaces, presentation of results, and special features. This paper examines these variations and explores some of the advantages and disadvantages of the three interfaces.  相似文献   

Secondary-school students' motivation for portfolio reflection     

H.L. De Bruin  A.E. Oosterbaan  F.J. Prins 《Irish Educational Studies》2013,32(4):415-431

Several studies concluded that deep reflection is infrequently reached in student portfolios. An explanation for these disappointing conclusions might be that motivation for portfolio reflection determines the quality of reflection. This study aimed to examine the relationship between motivation for using digital portfolios and reflection. Participants were 156 eleventh-grade students in secondary education, whose motivation for composing a digital portfolio was measured by the motivation part of the Motivated Strategies for Learning Questionnaire. Portfolios of 37 of the 156 students were examined in terms of the amount and nature of reflection by means of a coding scheme based on Mezirow's model of transformative learning. On average, one-fifth (19.5%) of the paragraphs in a portfolio contained reflection, and paragraphs with deep reflection were hardly found (0.8%). It was concluded that motivation for composing a portfolio was fair, but not related to the amount and nature of reflection. This exploratory study gives rise to further research into factors that might influence the quality of portfolio reflection.  相似文献   

Analyzing mathematics classroom cultures and practices     

Erik De Corte  Lieven Verschaffel 《International Journal of Educational Research》2007,46(5):247-251

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The ‘China Factor’ in post‐war Sri Lanka     

Malathi De Alwis 《Inter-Asia Cultural Studies》2013,14(3):434-446

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大学生体育消费行为决定因素的定量分析——以湖北为例   总被引：11，自引：0，他引：11  

段鹏  肖德  赵汉华 《体育科学》2007,27(5):36-40

对学生的体育消费行为进行分类，通过问卷调查的形式，采用统计、计量分析方法，深入分析每类体育消费行为的决定因素及与决定因素之间的定量关系。结果显示，除体育运动的兴趣爱好等主观因素外，学生年生活费用水平、课程压力大小、性别是影响学生体育实物消费的主要客观因素；学生年生活费用水平、性别是影响学生体育信息消费的主要客观因素；学生来源是影响学生体育劳务消费的主要客观因素。这对更深刻地认识体育消费行为、预测高校学生体育消费支出有重要意义。  相似文献   

Norman Rockwell and American Attitudes Toward Technology     

Gregg De Young 《Journal of American culture (Malden, Mass. : 2003)》1990,13(1):95-103

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