Digital Module 16: Longitudinal Data Analysis     

Jeffrey R. Harring  Tessa L. Johnson 《Educational Measurement》2020,39(3):137-138

In this digital ITEMS module, Dr. Jeffrey Harring and Ms. Tessa Johnson introduce the linear mixed effects (LME) model as a flexible general framework for simultaneously modeling continuous repeated measures data with a scientifically defensible function that adequately summarizes both individual change as well as the average response. The module begins with a nontechnical overview of longitudinal data analyses drawing distinctions with cross-sectional analyses in terms of research questions to be addressed. Nuances of longitudinal designs, timing of measurements, and the real possibility of missing data are then discussed. The three interconnected components of the LME model—(1) a model for individual and mean response profiles, (2) a model to characterize the covariation among the time-specific residuals, and (3) a set of models that summarize the extent that individual coefficients vary—are discussed in the context of the set of activities comprising an analysis. Finally, they demonstrate how to estimate the linear mixed effects model within an open-source environment (R). The digital module contains sample R code, diagnostic quiz questions, hands-on activities in R, curated resources, and a glossary.  相似文献   

关于我国离婚法定条件的探讨——混合标准还是单一标准     

邓娟 《安徽职业技术学院学报》2005,4(3):29-33

关于离婚法定条件的探讨贯穿于我国婚姻法发展的整个过程。从1950年新中国第一部婚姻法到1980年婚姻法的重新制定,乃至2001年婚姻法的修订,都是一个探索的过程,但探索的结论并没有很大的突破,仍是将离婚法定条件定为感情或婚姻破裂的单一标准。出于完善我国婚姻立法中的法理基础的需要,笔者以为应在我国婚姻立法中确立混合标准的离婚法定条件。  相似文献   

乒乓球双打及其训练     

余保星 《武汉体育学院学报》2002,36(3):88-89

分析乒乓球双打的特点，主要表现在交战双方队员的组成不同；技术特点（击球点、接球节奏、击球手法，步法移动等）不同；战术要求（发抢、接发球、击球落点，技战术组合，比赛心理等）不同和双打训练要点的不同。  相似文献   

新赛制对羽毛球女双技术风格的影响     

潘莉 《南京体育学院学报(社会科学版)》2001,15(6):138-139

经临场技术统计和调查研究后发现，在羽毛球女子项目试行每局7分制后，女双运动员必须在技术全面的基础上，更加突出速度、力量和凶狠性，以进攻打法为主的运动员，在比赛中更能取得较好成绩。女子项目男性化已经成为一种不可逆转的趋势。  相似文献   

论社会主义初级阶段的混合所有制经济     

王艳 《信阳师范学院学报(哲学社会科学版)》2004,24(4):41-43

根据党的十五大以来有关社会主义初级阶段基本经济制度的重要阐述,我国应从所有制结构、分配制度和经济运行机制等三个方面做进一步的调整、变革和创新。  相似文献   

基于OBE理念的二外日语混合式教学改革与实践     

闪晓宇 《保定学院学报》2022,(1)

为了培养具有创新思维和能力的复合型外语类高素质应用型人才,基于OBE理念采用混合式教学模式,提出课堂、作业、考核等方面的改革措施,对英语专业二外日语教学进行改革,取得了较好的教学效果,实现了教学效果和学生学习积极性的同步提高。  相似文献   

Bursting paradigms: a colour wheel of practice-research     

Sophie Hope 《Cultural Trends》2016,25(2):74-86

ABSTRACT

In this article, I question practice as a research paradigm by exploring its position in relation to non-positivist qualitative methodologies. Frayling’s [1994. Research in art and design. Royal College of Art Research Papers, 1(1), 1993/4] distinctions between research into, through, and as (for) practice are expanded to explore overlaps between these approaches. I argue for the need to understand the nuances of different epistemologies and ontologies that underpin diverse disciplinary approaches to practice-research. This is done through an analysis of a selection of Arts and Humanities Research Council (AHRC)-funded projects to find out how they are using and/or embedding practice in the research process. The resulting Colour Wheel of Practice-Research illustrates a spectrum of positions of practice in relation to research, suggesting existing research paradigms are bursting at the seams and that the “disciplinary matrix” of practice might offers other ways of knowing. The reason I have chosen to focus primarily on AHRC-funded projects is because it explicitly states its support of “practice-led research” and that it “remains dedicated to this area of research”. This article aims to add to knowledge of how and why practice-research is of continuing interest to research councils, universities, and those identifying as practice-based/led researchers.  相似文献   

超高含水原油混合流动及初始沉积特性     

邢晓凯  吕朝旭  刘珈铨 《中国科学院大学学报》2020,37(2):228-233

使用自行设计的实验装置，对超高含水原油的流动特性和初始沉积过程进行探究。系统研究实验温度、混合流速和体积含水率对超高含水原油初始沉积过程的影响，分析不同温度下原油的运动形态和初始沉积方式。初始沉积过程可分为蔓延沉积过程和粘连沉积过程，根据沉积特点和压降曲线的变化趋势将初始沉积过程分为3个阶段：沉积诱导期、快速沉积期和沉积动态平衡期。通过对沉积物碳数分布的分析，得知超高含水原油初始沉积过程中，同时存在剪切剥离作用、胶凝作用和分子扩散作用。实验温度和体积含水率主要通过改变胶凝作用和分子扩散来影响初始沉积过程，混合流速通过改变剪切剥离强度来影响初始沉积过程。  相似文献   

2015喀山游泳世锦赛混合双人跳水比赛制胜因素分析     

韩风歌 《湖北体育科技》2016,(9):813-818

以2015喀山游泳世锦赛混合双人跳水的比赛视频和成绩为研究对象,综合运用数理统计、录像观察、文献资料等研究方法。研究认为,混合双人跳水比赛除较量运动员的动作完成质量之外,动作的同步性对比赛结果有着极为重要影响,此外动作组别、动作姿势、转体周数及翻腾周数的选择也是影响比赛制胜的因素。  相似文献   

四阶障碍问题的混合有限元法     

谢正辉 《怀化学院学报》1989,(6)

本文讨论了固支障碍问题的混合有限元逼近,证明了离散问题解的收敛性。  相似文献