选址问题研究的若干进展

中值问题、覆盖问题、中心问题是选址研究中的三个经典问题，它们的应用非常广泛，也是迄今为止大多数选址理论研究的坚实基础。本文综述了近年来它们的研究进展，包括模型、求解方法以及相关问题，最后，指出这一领域未来研究的一些问题与方向。     

新建本科院校本科《高等数学》学习状况调查报告

通过对新建本科院校本科《高等数学》学习状况的问卷调查,弄清本科学生学习《高等数学》的基本状况,分析出造成《高等数学》学习困难的主要原因——自我效能感低、不良的非智力因素,并由此得出对教学的启示.     

基于中学化学课程的化学核心素养实证研究

运用德尔菲法，通过来自全国高等院校和中学一线的30名专家共同体基于我国社会发展背景和学生全面发展需求，以及自身的经验得出的有效决策和权威共识，得出中学化学课程应重点培养学生具备9项适应终身发展和社会发展需要的关键能力和观念。     

土壤地球化学在广南斗月金矿中的应用

对现已发现的超大型金矿和国内金矿资源进行统计,结果表明,大型、超大型矿床中与微细浸染型金矿相对应的金矿成因类型(如渗滤热液型金矿、含碳浅变质碎屑岩型金矿等)占有很大比例。因此开展对微细浸染型金矿的研究和找矿具有重要的实际意义。在广南斗月金矿开展1∶10000土壤地球化学测量(简称化探),了解测区以Au为主的As、Sb、Hg、Ag土壤地球化学背景,确定化探异常下限,圈定Au、As、Sb、Hg、Ag化探(次生晕)异常,根据各异常面积的大小、浓度的高低以及五个元素异常套合(组合)情况等综合因素,对化探综合异常进行评序和分级,结合地质简测等地质资料的综合研究分析,判别具有潜在找矿价值的异常区,为进一步地质勘探工作提供靶区。     

An environment-adjusted evaluation of citizen satisfaction with local police effectiveness: Evidence from a conditional Data Envelopment Analysis approach

Hard data alone are not sufficient to evaluate local police effectiveness in the new age of community policing. Citizens can provide useful feedback regarding strengths and weaknesses of police operations. However, citizen satisfaction indicators typically fail to accurately convey the multidimensional nature of local policing and account for characteristics that are non-controllable for the local police departments. In this paper, we construct a measure of perceived effectiveness of community oriented police forces that accounts for both multidimensional aspects of local policing and exogenous influences. In specific, this paper suggests the use of a multivariate conditional, robust order-m version of a non-parametric Data Envelopment Analysis approach with no inputs. We show the potentiality of the method by constructing and analyzing perceived effectiveness indicators of local police forces in Belgium. The findings suggest that perceived police effectiveness is significantly conditioned by the demographic and socioeconomic environment.     

ARIES: A Visual Path in the Investigation of Statistical Data

Abstract

The massive flood of numbers in ongoing large-scale periodic economic and social surveys commonly leaves little time for anything but a cursory examination of the quality of the data, and few techniques exist for giving an overview of data activity. At the U.S. Bureau of Labor Statistics, a graphical and query-based solution to these problems has recently been adopted for data review in the Current Employment Statistics survey. Chief among the motivations for creating the new system were: (1) Reduce or eliminate the arduous paper review of thousands of sample reports by review analysts; (2) allow the review analysts a more global view of sample activity and at the same time make outlier detection less of a strain; and (3) present global views of estimates over time and among groups of subestimates. The specific graphics approaches used in the new system were designed to quickly portray both time series and cross-sectional aspects of the data, as these are both critical elements in the review process. The described system allows the data analysts to track down suspicious sample members by first graphically pinpointing questionable estimates, and then pinpointing questionable sample data used to produce those estimates. Query methods are used for cross-checking relationships among different sample data elements. Although designed for outlier detection and estimation, the data-representation methods employed in the system have opened up new possibilities for further statistical and economic uses of the data. The authors were torn between the desire for a completely automatic system of data review and the practical demands of an actual survey operating under imperfect conditions, and thus viewed the new system as an evolutionary advance, not as an ideal final solution. Possibilities opened up by the new system prompted some further thinking on finding an ideal state.     

吸烟者调查抽样设计案例研究

本文通过对南宁市烟草公司拟进行的吸烟者调查抽样设计案例的研究,讨论了有限总体概率抽样原理和技术方面某些问题的具体应用。其中包括:抽样单位的选择;总体总值的单位均值估计量和比估计量;总体比率的比估计量;直接写出比估计量方差的法则,等等。在此基础上,进行了案例实证分析。     

机构调研行为的示范效应研究——基于深证“互动易”平台的实验证据

基于深交所“互动易”平台的机构调研信息和投资者问答数据,以投资者关注为聚焦点,通过剖析机构调研行为-投资者关注-股票流动性的传导路径,检验中国股票市场机构调研行为的示范效应。结论表明,机构调研行为具有强烈的示范效应,能够通过引起其他投资者的关注,促进中短期股票流动性的提高,且机构调研行为越集中,这种示范效应越强。此外,对于信息披露质量较低和机构持股比例较低的公司,机构调研行为更容易引起投资者的关注,示范效应更强。研究结论验证了机构投资者的信息优势性和行为影响力,支持了投资者的信息解读能力,为机构投资者的市场引导作用提供解释依据。     

给定抽样调查费用时最优轮换率及样本容量的确定

建立了前期和现期总的调查规模即样本容量不一定相等时的样本轮换模型,并求出了给定费用时的最优样本容量及最优轮换率,并分析了3种特殊情况,其中第3种特殊情况正是[1,2]中的有关结果.     

Studying advanced mathematics in England: findings from a survey of student choices and attitudes

The UK Government has set a goal that the “vast majority” of students in England will be studying mathematics to the age of 18 by the end of the decade. The policy levers for achieving this goal include new Core Maths qualifications, designed for over 200,000 students who have achieved good grades at the age of 16 but then opt out of advanced or A level mathematics. This article reports findings from a cluster-sampled survey of over 10,000 17-year-olds in England in 2015. Participants’ views on post-16 mathematics are presented and discussed. The main finding is that they are strongly opposed to the idea of compulsory mathematical study, but are less antithetical to being encouraged to study mathematics beyond 16. We consider how attitudes vary by gender, prior attainment, study patterns and future aspirations. The article considers the implications of these findings in the current policy landscape.