A Two-Stage Approach to Synthesizing Covariance Matrices in Meta-Analytic Structural Equation Modeling     

Mike W.L. Cheung  Wai Chan 《Structural equation modeling》2013,20(1):28-53

A great obstacle for wider use of structural equation modeling (SEM) has been the difficulty in handling categorical variables. Two data sets with known structure between 2 related binary outcomes and 4 independent binary variables were generated. Four SEM strategies and resulting apparent validity were tested: robust maximum likelihood (ML), tetrachoric correlation matrix input followed by SEM ML analysis, SEM ML estimation for the sum of squares and cross-products (SSCP) matrix input obtained by the log-linear model that treated all variables as dependent, and asymptotic distribution-free (ADF) SEM estimation. SEM based on the SSCP matrix obtained by the log-linear model and SEM using robust ML estimation correctly identified the structural relation between the variables. SEM using ADF added an extra parameter. SEM based on tetrachoric correlation input did not specify the data generating process correctly. Apparent validity was similar for all models presented. Data transformation used in log-linear modeling can serve as an input for SEM.  相似文献   

任务结构对大学生英语口语自我修正的影响     

肖婵 《海外英语》2013,(8)

该研究以现有自我修正理论为基础建立分析框架,搜集大学生在任务型教学中不同任务结构条件下英语口语产出,来调查任务结构对中国大学生口语产出自我修正的影响。30名英语中下等水平的学生随机从浙江省某一高校抽取,根据图片分别实施两组陈述性任务(一组结构紧凑,一组结构松散),然后将他们的录音转写下来对其自我修正行为分类。研究结果表明,任务结构对大学生英语口语自我修正有显著影响,在结构松散任务中,受试者实施更多的不同修正跟恰当修正,而在结构紧凑任务中实施更多错误修正。这反映了任务结构对说话者造成的认知负担影响其话语监测机制。该研究对英语教学与研究有一定的指导意义。  相似文献   

Longitudinal relationships between syntactic skills and Chinese written composition in Grades 3 to 6     

Pui-sze Yeung  Connie Suk-han Ho  David Wai-ock Chan  Kevin Kien-hoa Chung 《Journal of Research in Reading》2020,43(2):201-228

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The link between student-perceived teacher talk and student enjoyment,anxiety and discursive engagement in the classroom     

Gaowei Chen  Jiahong Zhang  Carol K. K. Chan  Sarah Michaels  Lauren B. Resnick  Xiaorui Huang 《British Educational Research Journal》2020,46(3):631-652

This study seeks to understand the emotional connection of teachers' academically productive talk (APT) with student learning from the students' perspective. Using a sample of 2,225 students (N_{7th grade} = 1,146 and N_{8th grade} = 1,079) from 16 middle schools in a city of China, we investigate the relationship between students' perceptions of their teachers’ APT, student emotions (enjoyment and anxiety) and their discursive engagement with others in the mathematics classroom. Results from structural equation modelling and mediation analysis show that after controlling for gender, family resources and mathematics achievement, student-perceived teacher APT was positively associated with their discursive engagement with classmates. Furthermore, student enjoyment and anxiety in class mediated the relationship between student-perceived teacher APT and student discursive engagement with classmates. Multi-group analysis revealed that the model was invariant across genders and grades, indicating that the associations were applicable to male and female students as well as to seventh and eighth graders. These findings shed light on the emotional relationship of teacher APT with the discursive engagement of their students. Although prior research observes a positive relationship between teacher productive classroom talk and student discursive engagement primarily through classroom observations and teacher reflections, this study provides evidence from the students’ perspective and highlights the mediating role of student emotions in the relationship.  相似文献   

Resolving the amalgam: connecting pedagogical content knowledge,content knowledge and pedagogical knowledge     

Vanessa Kind  Kennedy K. H. Chan 《International Journal of Science Education》2019,41(7):964-978

ABSTRACT

This paper concludes the Special Issue (SI) ‘Probing the Amalgam: the relationship between science teachers’ content, pedagogical and pedagogical content knowledge’. We review the five papers (Sorge et al; Gess-Newsome et al; Kind; Pitjeng-Mosabala and Rollnick; and Liepertz and Bronowski) by discussing evidence these present regarding the relationships between content knowledge (CK), pedagogical knowledge (PK) and pedagogical content knowledge (PCK); the development of CK, PK and PCK in novice and experienced secondary science teachers and how CK, PK and/or PCK impact students’ learning. In conclusion, we draw these findings together in offering proposals for future research via reconsideration of Shulman’s amalgam. This includes post-hoc examination of a PCK model known as ‘the Consensus Model’ (Gess-Newsome, [2015]. A model of teacher professional knowledge and skill including PCK: Results of the thinking from the PCK Summit. In A. Berry, P. J. Friedrichsen, & J. Loughran (Eds.), Re-examining Pedagogical Content Knowledge in Science Education (pp. 28–42). New York, NY: Routledge; Neumann, Kind, & Harms [2018]. Probing the amalgam: The relationship between science teachers’ content, pedagogical and pedagogical content knowledge. International Journal of Science Education, 1–15) and presentation of a novel PCK structure based on evidence from the SI studies.  相似文献   

Validation of the swimming competence questionnaire for children     

Derwin K. C. Chan  Alfred Sing Yeung Lee  Duncan J. Macfarlane  Martin S. Hagger  Kyra Hamilton 《Journal of sports sciences》2020,38(14):1666-1673

ABSTRACT

Two studies were employed to test the reliability and validity of the Swimming Competence Questionnaire (SCQ) among primary school children. Study 1 was a cross-sectional survey in 4959 primary school children. Study 2 was a pre-post-test quasi-experiment among 1609 primary school children who underwent a 20-lesson learn-to-swim programme. In Study 1, exploratory structural equation modelling revealed excellent goodness-of-fit and scale reliability for a two-factor model comprising distance and skill factors, which supported the construct and convergent validity. SCQ scores were significantly and positively correlated with swimming outcomes (i.e., self-efficacy, intention, swimming frequency), which supported SCQ’s concurrent and criterion validity. Average variance extracted for the SCQ factors exceeded cut-off criteria supporting discriminant validity. In Study 2, pre-test SCQ scores correlated significantly and positively with the SCQ scores, self-efficacy, intention, and swimming frequency at post-test, which supported SCQ’s test-retest reliability and predictive validity. Positive intraclass correlation between SCQ scores and coach ratings at post-test provided evidence for SCQ’s inter-rater reliability. SCQ scores significantly improved at post-test, which supported SCQ’s ecological validity. In conclusion, findings indicate that the SCQ is a valid and reliable measure to assess primary school children’s swimming competence, in terms of swimming distance and basic water survival skills.  相似文献   

浅谈色彩在版面设计应用中的误区及对策     

荆婵 《新闻界》2008,(6):195-196

版面改革,即着重从版面设计和色彩,线条等运用上着手,加强报纸的视觉冲击力,力显除新闻价值以外能吸引受众的因素。因此．色彩运用成为了“版面改革”的重头之戏。很多报纸将“改革”重点放在了色彩如何运用上。  相似文献   

Examining public acquisition of science knowledge from social media in Singapore: an extension of the cognitive mediation model     

Shirley S. Ho  Xiaodong Yang  Amber Thanwarani  Juliana M. Chan 《亚洲交流杂志》2017,27(2):193-212

This study extends the cognitive mediation model (CMM) by examining the role of social media in cultivating public science knowledge. A sample of 901 Singaporeans was collected through an online survey panel. The results showed that the CMM could be applied to a social media context with a focus on science literacy. Specifically, the findings indicated that people with higher levels of surveillance gratification and social utility motivations tended to pay more attention and to elaborate more about science news that they encounter on social media. Likewise, people with greater social utility motivation tended to engage in greater interpersonal discussions on social media. Notably, attention to news on social media had an indirect association with science knowledge through news elaboration and interpersonal discussion on social media. Implications for theory and practice for science communication were discussed.  相似文献   

网络信息资源著作权风险规避中的委托代理关系     

李婵  徐龙顺  张文德 《图书情报工作》2017,61(22):45-51

[目的/意义]通过对网络信息资源著作权风险中著作权人与网络服务提供者的博弈分析,在利益均衡的基础上提出著作权风险规避的策略。[方法/过程]运用委托代理理论的基本原理,分析著作权人与网络服务提供者的委托代理关系,构建信息不对称条件下著作权人为风险中性和风险规避时的委托代理模型,并进一步对两种情况下的各绩效指标进行探讨。[结果/结论]在委托代理机制下,著作权人与网络服务提供者在风险规避上的利益具有一致性;在两种不同情况下著作权人的激励程度、网络服务提供者的努力程度以及总的期望收益均有显著变化;著作权人的激励程度以及双方的最终收益与网络服务提供者的努力程度、努力成效、风险规避程度、项目完成能力等因素密切相关。基于此,可以通过健全奖惩激励机制、完善利益补偿机制、强化监督管理机制来规避网络信息资源著作权中的风险问题,实现委托代理双方收益的帕累托最优。  相似文献   

欧氏空间中线性变换的注记     

彭白玉  李元旦  黄灿 《衡阳师范学院学报》2008,29(6)

就欧氏空间中线性变换的某些问题进行了探讨,获得了一些有意义的结论,从而揭示了线性变换的一些规律.  相似文献