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   

Medieval and renaissance glass technology in Valdelsa (Florence). Part 1: raw materials, sands and non-vitreous finds     

U. Casellato  F. Fenzi  P. Guerriero  S. Sitran  P. A. Vigato  U. Russo  M. Galgani  M. Mendera  A. Manasse 《Journal of Cultural Heritage》2003,4(4):337-353

A significant number of archaeological finds of the 13th–16th century from the Tuscan sites of Germagnana and Gambassi in Valdelsa—FI, was studied by different physico-chemical investigations (SEM–EDS, ICP, Mössbauer spectroscopy, XRD, XRF, TG-DTA) in order to contribute to clarify the production methodology and the pre-industrial glass manufacture technology. The studied samples are mainly non-vitreous finds as production waste, refractory materials, crucibles and raw materials; also vitreous finds as frits, skims, glasses (glass masses, glass working waste and finished products) have been taken into consideration. The obtained petrographic and physico-chemical data strongly suggest that both Gambassi and Germagnana glass manufactures were strictly connected with the sources of vitrifiable materials, situated in Tuscan sand quarries. In particular a comparison between sands from the neighbouring quarries and appropriate finds of the two archaeological sites evidences that the employed vitrifiable materials possibly belong to La Casina La Cava resort. The archaeological classification, based on macroscopic observation and stratigraphic position, was compared and verified with the scientific classification of the examined finds of Germagnana and Gambassi sites based on their composition, morphology and physico-chemical properties.  相似文献   

介入治疗输卵管妊娠的临床观察   总被引：1，自引：0，他引：1  

陈志林  张庆  叶丽晶  和梅 《玉溪师范学院学报》2003,19(Z1):94-96

用介入治疗技术对10例患者进行超选择性子宫动脉插管一次性5-氟尿嘧啶冲击治疗,并与口服RU486并肌注丙酸睾丸酮作为对照组进行比较.结果显示住院时间介入治疗法最短;输卵管切除术比例,RU486组明显高于介入治疗组;治疗后血HCG下降介入治疗组最快.说明在对输卵管妊娠进行治疗时,应根据具体情况采取相应措施,但5-氟尿嘧啶介入治疗对诊治输卵管妊娠具有明显的优势.  相似文献   

表象训练对体操教学效果的影响   总被引：3，自引：0，他引：3  

刘岳江  陈瑞宁  刘远航 《武汉体育学院学报》2003,37(1):146-147,158

根据体操教材内容特点与学生实际情况，将学生分成两组进行实验，对照组进行了常规教学，实验组在常规教学基础上实施表象训练（思维训练）。实验证明，表象训练的教学效果优于常规教学方法。  相似文献   

太极拳健身技击科学原理初探     

陈小军 《体育成人教育学刊》2004,20(6):84-85

太极拳是中华武术最具代表性的拳种之一,在世界范围内得到了广泛传播,其健身和技击的价值得到了广泛的认同,运用耗散结构理论阐述了太极拳的健身技击原理.  相似文献   

运动疗法对改善心功能不全的效果     

王新建  王颖 《体育学刊》2004,11(4):56-58

通过对25例急性功能不全者(如心脏移植术后、急性心肌梗死致严重心衰病情稳定后)及慢性心衰患者(心功能不全Ⅱ级和Ⅲ级)进行为期18周的运动疗法，结果发现：通过有规律的适度体力活动，可以有效改善心衰患者骨骼肌的生化代谢、心肌功能及运动耐力，改善气体交换功能，增强体力活动耐力。  相似文献   

健身运动预防和治疗老年性疾病的作用   总被引：4，自引：0，他引：4  

乔玉成 《山西师大体育学院学报》2004,19(3):83-86

文章就健身运动对预防和治疗老年性疾病的作用进行了理论综述研究，结合目前最新的研究成果指出健身活动对老年常见多发疾病的预防和治疗具有积极的作用。  相似文献   

体育赛事电视节目娱乐化之路——谈湖南卫视电视栏目"国球大典"     

林萍  杨文运 《体育学刊》2006,13(5):40-43

“国球大典”由民间海选、大师对抗赛、乒乓嘉年华三大主体活动组成,这种高、低端互动的体育狂欢,创造性地走出了一条体育赛事电视节目“娱乐化”之路,促进了体育与大众传媒的互动与结合,促进了国内体育的市场化发展。  相似文献   

中、泰两国体育教学的比较   总被引：1，自引：0，他引：1  

马军 《广州体育学院学报》2003,23(5):94-95

通过对亚洲的中国、泰国体育教学的比较研究，在指导思想、教学目标、教学大纲和教学方式等都存在着较大的差异。汲取泰国在体育与健康方面的长处对我国体育教学改革具有积极的作用。  相似文献   

透视西部地区民族体育旅游业的社会经济效应   总被引：9，自引：0，他引：9  

刘少英 《北京体育大学学报》2006,29(1):14-15,24

我国西部地区具有丰富的民族体育旅游资源,民族体育旅游业由于其关联与辐射作用而对西部地区社会经济发展具有明显的促进作用.剖析了其在弘扬民族文化,脱贫致富缩小区域差异;促进相关产业发展、优化产业结构;增加外汇收入与回笼货币;增加就业、维护社会稳定等诸方面的促进作用,从而引导人们关注西部民族体育旅游业的重要意义.  相似文献