期刊数据库对中医专业核心期刊收录情况的统计分析

通过国内3种期刊全文数据库，对近五年中国医学类的桂心期刊论文的收录情况进行统计分析发现，期刊全文数据库对中医核心期刊的收录率．有比较大的差异。研究人员在进行文献检索时。应根据课题要采，择库而用。     

不同的分组方法对赫斯特指数的影响

赫斯特指数的计算过程需要对研究的时间序列数据进行分组,而不同的分组情况对赫斯特指数会产生不同的影响。以深圳股票市场1997-2001年的日收盘成分指数为例,表明组内数据为15个左右时计算的赫斯特指数的可信度较高,但不同的分组方法却不会使结论发生质的变化,仅是量的改变。     

谈谈数据库多项目的快速统计

在利用关系数据库处理数据与信息时 ,统计工作是常需要作的工作。本文主要是探讨如何利用数组与索引方法来改进传统的分类统计。以实现数据的快速统计。提高整个程序的运行速度     

英语写作中衔接语作用的实证研究

本文拟通过韩礼德和哈桑(Halliday＆Haaan)的衔接理论探讨衔接手段在语篇构建中所起的重要作用，采用语言学中的统计方法，对120名非英语专业大二本科生英语习作中的高质量作文与低质量作文就语篇衔接特点进行了比较分析。此项研究基于如下假设：高质量作文中的词汇衔接与语法衔接手段的频度分布(fhquency distribution)比次低质量作文要高。目的是指出什么类型的衔接手段有利于产生高质量作文，结果是假设得以验证。     

麦氏方程组的微观基础

从单原子分子，根据统计学的观点导出宏观的麦氏方程组，从而给出宏观麦氏方程组的微观基础。     

Revisiting the Model Size Effect in Structural Equation Modeling

Fitting a large structural equation modeling (SEM) model with moderate to small sample sizes results in an inflated Type I error rate for the likelihood ratio test statistic under the chi-square reference distribution, known as the model size effect. In this article, we show that the number of observed variables (p) and the number of free parameters (q) have unique effects on the Type I error rate of the likelihood ratio test statistic. In addition, the effects of p and q cannot be fully explained using degrees of freedom (df). We also evaluated the performance of 4 correctional methods for the model size effect, including Bartlett’s (1950), Swain’s (1975), and Yuan’s (2005) corrected statistics, and Yuan, Tian, and Yanagihara’s (2015) empirically corrected statistic. We found that Yuan et al.’s (2015) empirically corrected statistic generally yields the best performance in controlling the Type I error rate when fitting large SEM models.     

Analytical method for promoting process capability of shock absorption steel

INTRODUCTIONTherearemanymanufacturedtoolsandprod uctsfordailyusethatarefabricatedbyironsuchas:ironmongery ,ironplate,ironstrap ,ironwire ,ironstairsandotherironworks.Theseproductsimprovethelivingconditionsofourlife.Toachievethevarioususegoalsandgivespecia…     

义务教育阶段统计有关知识的内容定位与教材实施

统计观念是统计意识、统计技能和统计评判质疑能力的统一体.统计观念主要表现在:(1)能从统计的角度思考与数据信息有关的问题;(2)能通过收集数据、描述数据、分析数据的过程,做出合理的决策,认识到统计对决策的作用;(3)能对数据的来源、处理数据的方法以及由此得到的结论进行合理的质疑.在教学素材选取时,务必贴近学生的生活实际,力求素材的真实可靠性、趣味性、现代性,注意加强统计和数与代数、空间与图形特别是与概率等数学学习板块的联系.     

《比较教育研究》计量评价与比较教育研究发展现状分析

文章以<中国期刊全文数据库>为统计源,对1998-2003年<比较教育研究>进行了计量评价,并得出我国比较教育研究人员的个人及小规模的智力因素在研究中仍起着决定性主导作用、科研人员使用的外语文献资料数量要高于中文文献资料、外语水平较高,和该刊论文质量、在国内比较教育研究方面所占有的重要地位都很高等结论.     

Four New Corrected Statistics for SEM With Small Samples and Nonnormally Distributed Data

When the assumption of multivariate normality is violated and the sample sizes are relatively small, existing test statistics such as the likelihood ratio statistic and Satorra–Bentler’s rescaled and adjusted statistics often fail to provide reliable assessment of overall model fit. This article proposes four new corrected statistics, aiming for better model evaluation with nonnormally distributed data at small sample sizes. A Monte Carlo study is conducted to compare the performances of the four corrected statistics against those of existing statistics regarding Type I error rate. Results show that the performances of the four new statistics are relatively stable compared with those of existing statistics. In particular, Type I error rates of a new statistic are close to the nominal level across all sample sizes under a condition of asymptotic robustness. Other new statistics also exhibit improved Type I error control, especially with nonnormally distributed data at small sample sizes.