Two-Level Dynamic Structural Equation Models with Small Samples

Advances in data collection have made intensive longitudinal data easier to collect, unlocking potential for methodological innovations to model such data. Dynamic structural equation modeling (DSEM) is one such methodology but recent studies have suggested that its small N performance is poor. This is problematic because small N data are omnipresent in empirical applications due to logistical and financial concerns associated with gathering many measurements on many people. In this paper, we discuss how previous studies considering small samples have focused on Bayesian methods with diffuse priors. The small sample literature has shown that diffuse priors may cause problems because they become unintentionally informative. Instead, we outline how researchers can create weakly informative admissible-range-restricted priors, even in the absence of previous studies. A simulation study shows that metrics like relative bias and non-null detection rates with these admissible-range-restricted priors improve small N properties of DSEM compared to diffuse priors.     

On Fitting a Multivariate Two-Part Latent Growth Model

The purpose of this study was to explore the influence of the number of targets specified on the quality of exploratory factor analysis solutions with a complex underlying structure and incomplete substantive measurement theory. Three Monte Carlo studies were performed based on the ratio of the number of observed variables to the number of underlying factors. Within each study, communality, sample size, and the number of targets were manipulated. Outcomes included a measure of congruence and a measure of variability with regard to the rotated pattern matrix. The magnitude of the main effect for the influence of the number of targets on congruence and variability ranged from moderate to large. The magnitude of the interaction between the number of targets and level of communality ranged from small to moderate with regard to congruence and variability. Consistent with theoretical expectations, the minimum number of targets to specify to be reasonably assured of obtaining an accurate solution varied across study conditions.     

Graphical Extension of Sample Size Planning With AIPE on RMSEA Using R

Kelley and Lai (2011) recently proposed the use of accuracy in parameter estimation (AIPE) for sample size planning in structural equation modeling. The sample size that reaches the desired width for the confidence interval of root mean square error of approximation (RMSEA) is suggested. This study proposes a graphical extension with the AIPE approach, abbreviated as GAIPE, on RMSEA to facilitate sample size planning in structural equation modeling. GAIPE simultaneously displays the expected width of a confidence interval of RMSEA, the necessary sample size to reach the desired width, and the RMSEA values covered in the confidence interval. Power analysis for hypothesis tests related to RMSEA can also be integrated into the GAIPE framework to allow for a concurrent consideration of accuracy in estimation and statistical power to plan sample sizes. A package written in R has been developed to implement GAIPE. Examples and instructions for using the GAIPE package are presented to help readers make use of this flexible framework. With the capacity of incorporating information on accuracy in RMSEA estimation, values of RMSEA, and power for hypothesis testing on RMSEA in a single graphical representation, the GAIPE extension offers an informative and practical approach for sample size planning in structural equation modeling.     

硫氰酸亚铜产品纯度的测定

分别采用佛尔哈德返滴定法和间接碘量法测定了由废液制得硫氰酸亚铜产品中硫氰酸根和总铜的含量。硫氰酸根的待测试液由样品与NaOH溶液通过加热反应制备;测定总铜的试液分别采用硫酸—硝酸和过氧化氢—硝酸与样品反应制备,实验结果表明,用两种方法制备铜试液所测得的总铜含量无差异。所提出的用过氧化氢—硝酸制备总铜试液的方法较硫酸—硝酸制备方法具有方便、快捷的优点。     

选词批评与词法示范——论许昂霄的《晴雪雅词》、《词综偶评》

清代词选多为专业词家编纂,手眼甚高,在选本的功用上,往往侧重于推尊词体、开宗立派,而于示人词法方面则略有忽视.许昂霄坐馆于涉园张氏,因指导张氏子弟填词之需,编选《晴雪雅词》,评点《词综》,偏重于词法的讨论与示范.另外,《词综偶评》、《晴雪雅词》的选词理念和批评主张,对浙派思想既有继承,又有所批判,提出尚自然,贵性情等创作思想,来纠正浙西词派的偏至,一定意义上弥补了浙派的若干不足.     

论日本语言的文化特征与教学中的文化导入

尽管中日两国之间文化交流历史久远,但日本因其独特的民族性格、地理风情、宗教信仰等因素,形成了其独特的文化特征。所以,了解日语的文化特征是进行日语教学必不可少的环节。只有充分理解所学语言所体现的社会文化背景,并能将这一社会文化背景导入到语言的学习中来,才能真正地将一门语言融会贯通。     

网络环境下大学英语教学内容的文化拓展

语言是文化的重要载体和传播工具,又是文化的一部分,二者互相影响,互相作用.学习和运用外语必须了解与这种外语密切相关的文化.传统的外语教学偏重于语言本身的教授,大学英语教学应重视学生文化知识的拓展.文中阐述了大学英语教学内容文化拓展的必要性,提出了网络环境下文化导入的三种方法,有助于学生跨文化交际能力的培养.     

如何制定小学语文单元知识网络图

制定单元知识网络图,旨在明确每个单元、每篇课例“教什么”“学什么”的内容,尝试“怎么教”“怎么学”的有效方法,以其提高教学质量。     

图书丢失率调查方案的设计与实践

文章介绍江南大学图书馆以图书半衰期作为新旧书划分线而设计的一种调查图书丢失率的方案,并用加权数学公式对数据进行分析处理,指出新书丢失率的确认和控制将是图书馆馆藏管理的重点,并对方案的初步实践进行反思和总结,给出合理的图书丢失率的数值范围.     

清代常熟诗坛概论

清代常熟文学分清初和清中叶(晚清属近代文学)两个阶段.清初,常熟诗坛呈现出一派繁荣景象,主要体现在两个层面:一是遗民诗人如群星璀璨,创作了众多忧国忧民的作品,烙下了时代印痕;二是以钱谦益为核心的虞山诗派,与云间、娄东鼎足而立,给中国诗歌史留下了辉煌的一页.清中叶,"神韵"、"格调"、"性灵"诸说登陆常熟诗坛,造就了许多才华出众,颇具影响的诗人,给虞山文坛增光添彩.