A permutation alternative and other test procedures for spatially correlated data in one-way anova

Research in many disciplines involves data with spatially correlated observations. Spatial dependence violates the independent errors assumption required for techniques such as the standard one-way analysis of variance for a completely randomized design. The testing methodology within the correlated errors approach has not been investigated within a spatial context. For one-way fixed effects analysis of variance, a permutation test and tests associated with the correlated errors approach are investigated through simulation. No single test was superior with respect to both power and size but the standard Wald F test and a simple adjustment to it performed well overall.     

Influence of National Qualifications Frameworks in Conceptualising Feedback to Students

Social work students in Britain receive feedback on a range of academic and practice issues as they progress through qualifying courses, however the way in which feedback differs to reflect the increasing complexity of learning as the course progresses is unclear. There is little, if any, guidance at a national level and the most widely known documents that provide information about the hierarchy of qualifications are the National Qualifications Frameworks (NQFs). Despite the widespread acceptance of NQFs there is little evidence supporting their use in professional areas such as social work. This study uses a documentary analysis to critique the Scottish Credit and Qualifications Framework (SCQF). The findings suggest that there are fundamental difficulties with the SCQF and its value in helping academics to better conceptualise feedback that reflects the increasing complexity of learning throughout the social work qualifying course. Whilst the SCQF is specific to a Scottish context, it is suggested that the inherent limitations and dominance of a neo-liberal ideology are common to other NQFs. It may be necessary to create the conditions where academics and students are able to discuss and debate the merits of NQFs and their implementation in social work qualifying courses.     

Blood on the tracks: Critically re‐reading a government occupational health and safety inquiry

This paper brings to light forms of interpretive closure embedded in a Government inquiry into rail industry occupational safety and heath. The paper shows how particular interpretive moves by the Inquiry had the effect of obscuring a critical analysis of economic and political relations. The analysis uses publicly available documentary data and is undertaken using interpretive and political economic forms of analysis in a multiple framework approach.     

The numerical evaluation of the distribution function of a bilinear from to a quadratic from with econometric examples

This paper considers a general and computationally convenient method of evaluating the distribution function of statistics that are the ratio of a bilinear form to a quadratic form. Numerous Economemc applications of the method are given.     

高校教学考试现状分析与改革思路

高校教学考试是高校教学工作的重要环节,是检测、鉴定、衡量师生教学质量的主要手段。教学考试在教学中具有教育、管理、导向、激励的积极作用,同时在制度、方法、监管、评价、时间安排等方面也存在一些负面问题。分析教学考试利弊,扬长避短,改革创新,营造科学适宜的教学考试机制,对撬动高校教学改革,提高教学质量,培养全面发展的合格大学生具有至关重要的意义。     

面板数据的贝叶斯Elastic Net分位数回归方法及其应用研究

本文首次将Elastic Net这种用于高度相关变量的惩罚方法用于面板数据的贝叶斯分位数回归,并基于非对称Laplace先验分布推导所有参数的后验分布,进而构建Gibbs抽样。为了验证模型的有效性,本文将面板数据的贝叶斯Elastic Net分位数回归方法(BQR. EN)与面板数据的贝叶斯分位数回归方法(BQR)、面板数据的贝叶斯Lasso分位数回归方法(BLQR)、面板数据的贝叶斯自适应Lasso分位数回归方法(BALQR)进行了多种情形下的全方位比较,结果表明BQR. EN方法适用于具有高度相关性、数据维度很高和尖峰厚尾分布特征的数据。进一步地,本文就BQR. EN方法在不同扰动项假设、不同样本量的情形展开模拟比较,验证了新方法的稳健性和小样本特性。最后,本文选取互联网金融类上市公司经济增加值(EVA)作为实证研究对象,检验新方法在实际问题中的参数估计与变量选择能力,实证结果符合预期。     

双电机驱动自同步振动磨动力响应研究

以双电机驱动自同步振动磨为研究对象,对其进行简化处理,建立力学模型。通过对其施加X,y方向的简谐激 振力,建立无阻尼系统强迫振动和有阻尼系统强迫振动的数学模型,在此基础上,确定Rayleigh阻尼的常数α和β,利用 有限元ANSYS软件进行瞬态动力学分析,研究其在动载荷作用下的变形情况。研究结果表明：在工况频率16 Hz下,节 点运动轨迹更接近圆形,距理想粉碎效果的圆形轨迹较近,粉碎效果较好,进入稳定期的时间较快;在共振频率42 Hz 下,节点轨迹振幅更大,进入稳定期较慢,阻尼对振动的衰减作用较强;不同阻尼比对振动的衰减作用成正比关系。因 此,可以通过控制阻尼比等参数获得更有利的研磨效果,提高研磨效率。     

大数据研究经典的研读与批判—读维克托·迈尔 舍恩佰格《大数据时代》有感

作者在研读维克托·迈尔-舍恩佰格《大数据时代》后,对舍恩佰格的三个主要观点展开讨论并提出质疑,认为随机样本和全体数据同样需要,精确性和混杂性各有所用,相关关系离不开因果关系.文章还介绍了国外学者关于大数据伦理的讨论.     

基于SWOT分析的喇叭河森林公园旅游产品策划

基于SWOT分析,喇叭河森林公园既有区位、资源等方面的旅游开发优势,又有生态环境脆弱、资金投入不足、市场开拓不足等方面劣势;既有发展机遇,又面临多方面的挑战.因此,喇叭河森林公园旅游产品策划就应基于锥形的旅游产品结构体系,以"市场导向,资源依托"为策划原则,引进品牌战略,构建多样的项目集群,并实行多元化的经营模式,以吸引更多的游客.     

Two preprocessing algorithms for climate time series

We propose two preprocessing algorithms suitable for climate time series. The first algorithm detects outliers based on an autoregressive cost update mechanism. The second one is based on the wavelet transform, a method from pattern recognition. In order to benchmark the algorithms'' performance we compare them to existing methods based on a synthetic data set. Eventually, for exemplary purposes, the proposed methods are applied to a data set of high-frequent temperature measurements from Novi Sad, Serbia. The results show that both methods together form a powerful tool for signal preprocessing: In case of solitary outliers the autoregressive cost update mechanism prevails, whereas the wavelet-based mechanism is the method of choice in the presence of multiple consecutive outliers.