我国城镇居民消费与收入关系分析——基于地理加权回归模型(GWR)的实证分析

空间数据一般具有空间非平稳性的特点,究其原因是地理空间上的区域缺乏均质性,存在高消费地区和低消费地区、中心(核心)和外围(边缘)等经济地理结构,从而导致我国城镇居民消费存在较大的空间差异性。对此,本文试图采用地理加权回归模型来分析我国城镇居民消费与收入的关系,从实证分析的结果提出几点建议和对策。     

Class size effects on mathematics achievement in Cyprus: evidence from TIMSS

Class size reduction has been viewed as one school mechanism that can improve student achievement. Nonetheless, the literature has reported mixed findings about class size effects. We used 4th- and 8th-grade data from TIMSS 2003 and 2007 to examine the association between class size and mathematics achievement in public schools in Cyprus. We employ instrumental variables methods, and take advantage of a regression discontinuity design to examine causal effects of class size on mathematics achievement. The results indicate a non-significant relationship between class size and mathematics achievement in 8th grades. However, there is evidence of positive class size effects in 4th grade. The gender gap is significant and favoured males in 4th grade and females in 8th grade. SES indexes such as parental education and items in the home are positively and significantly related to mathematics achievement. Teacher and school variables are not significantly related with mathematics achievement.     

The impact of the Gates Millennium Scholars Program on college and post-college related choices of high ability,low-income minority students

In this paper we analyze the impact of the Gates Millennium Scholarship Program on several outcome variables using a regression discontinuity design. We find that GMS recipients have lower college loan debt and parental contributions toward college expenses and work fewer hours during college than non-recipients. We also find that GMS recipients have higher grade point averages in their junior year of college and are more likely to aspire to a Ph.D. degree than non-recipients.     

考察阶段模型的阶段性假说-一项银行员工体育锻炼行为的实证研究

本研究运用"柏林锻炼阶段"模型调查了211名银行员工的体育锻炼行为,并通过检验银行员工的锻炼自我效能变量和社会支持变量在各阶段中的非连续性模式和非线性趋势,考察了该阶段模型的阶段性假说.研究结果没有充分支持上述阶段性假说.未来研究仍需进一步修订该阶段模型.     

人力资本与欧盟区域创新活动研究——基于探索性空间数据分析和地理加权回归模型

运用探索性空间数据分析和地理加权回归方法,实证分析2008—2015年欧盟28个成员国人力资本要素的空间相关性及其对欧盟区域创新产出的影响。研究发现:第一,虽然人力资本要素存在空间相关性,但是正呈现扩散趋势;第二,不同国家的人力资本要素存在不同空间集聚模式;第三,欧盟多数国家的人力资本对专利申请量有正向作用,25~34岁博士毕业生数/千人对欧盟区域创新产出的正向作用最为突出,其次是非欧洲籍博士生比重和30~34岁受过高等教育人口比重,而20~24岁高中以上学历人口比重的推动作用有限,甚至会产生抑制作用。     

农田生态系统田间结构的优化配置——以辽河平原中部地区米麦间套作为例

连续2a采用4因子二次通用旋转组合设计，研究了辽河平原中部地区米麦间套作产量与田间结构因子中的玉米播期X1、玉米株距X2、玉米幅宽X3、和小麦幅宽X4关系。结果表明：作物产量Y与试验所设田间结构因子符合二次多项式回归方程；田间结构单因子，对产量作用大小依玉米幅宽、玉米播期、小麦幅宽对产量则呈极显著的正交互效应。玉米株距和幅宽〉玉米播期和小麦幅宽〉玉米播期和株距；利用频数分析法可分别确定米麦间套作不同产量水平田间结构的优化配置。指出了研究区域目前米麦间套作普遍存在的主要问题，根据该研究提出了解决问题的途径。     

一种新的多元回归思路——因子与回归联合分析法

多元回归分析是一种重要的数据处理方法,变量的多重共线性诊断是回归分析的重要环节.针对传统的多元回归分析中变量间的多重共线性问题,提出一种新的求解多元回归问题的思路,该思路与传统方法相比具有明显的优势.     

Do organizational variables influence satisfaction with nursing student practices?

Clinical practices are a vital component in the education of registered nursing students. This study analyzed the influence of organizational variables on satisfaction with clinical practices. A cross-sectional study design involved 572 registered nursing students. Two statistical methodologies, hierarchical regression models and qualitative comparative analysis of diffuse sets, were used for data analysis. In the hierarchical regression models the number of students supervised predicted satisfaction with clinical educator (β = -.22; p ≤ .001), environment (β = -.13; p ≤ .05) and overall satisfaction (β = -.15; p ≤ .05). However, in the qualitative comparative analysis, the type of center, as well as the number of services assigned to the clinical educator and the number of students per clinical educator period were conditions that influence satisfaction with clinical practices. The type of center and the clinical educator are key factors related to registered nursing students’ satisfaction with clinical practices.     

COVID-19 impact on jobs at private schools and colleges in Northern Ethiopia

The disruptive effects of COVID-19 have impacted all sectors of our society including education. This study identified the factors influencing the private schools’ and colleges’ decision to reduce their teaching staff during the COVID-19 lockdown using survey data analyzed using Heckman two-step regression model. The results showed that age, accommodation level, hourly payment rate, tax grade level, money borrowed from government or banks, loan repayment suspension, tax payment deferral, the number of administrative employees, the student-to-administrative employee ratio, and the educational institution’s category were the significant factors affecting teaching employee reduction during the lockdown. The results of this study can help the various education sector stakeholders to take coordinated measures to withstand COVID-19 type of shocks.     

支持向量机在图像去噪处理中的初步研究

图像去噪是图像分割等操作的关键预处理环节,是从图像处理过度到图像分析和理解的重要手段之一,是图像处理中研究的重点内容.现有典型的一些图像去噪方法大多采用平滑滤波机理,在保护图像边缘信息等方面存在一定的局限性. 本文在对现有典型的图像去噪方法总结的基础上,提出了一种图像去噪的新方法--利用支持向量机(SVM)技术构建图像去噪滤波器,并在实现算法和实验仿真方面做了初步探讨.