激光散斑相位差的条件统计分布与表面粗糙度的关系

在粗糙表面高度起伏服从高斯统计和表面服从圆型相关的情况下，分析了由弱散射体产生的远场高斯激光散斑相位差的条件统计分布与表面粗糙度的关系．     

The Statistics of Simulating Chaos

When simulating a dynamical system, the computation is actually of a spatially discretized system, because finite machine arithmetic replaces continuum state space. For chaotic dynamical systems, the discretized simulations often have collapsing effects, to a fixed point or to short cycles. Statistical properties of these phenomena can be modelled with random mappings with an absorbing centre. The model gives results which are very much in line with computational experiments. The effects are discussed with special reference to the family of mappings f (x)=1-|1-2x|,x [0,1],1,<,,<,. Computer experiments show close agreement with predictions of the model.     

我国商业银行无形资产统计问题研究

摘　　要:商业银行无形资产是形成商业银行核心竞争力的基础和产生超额收益的源泉,加强商业银行无形资产统计工作,有利于充分揭示商业银行无形资产基本内容和对核心竞争力的影响。笔者认为,目前我国商业银行无形资产统计指标体系设置不完整,统计制度不健全,统计内容不全面,统计分析不深入,影响经济决策。笔者认为,完善商业银行无形资产统计制度时,应从组织结构类、客户关系类、知识创新类和人力资本类等四个方面对无形资产进行统计,逐步细化统计指标,明确具体的统计内容,建立、健全无形资产价值信息系统,深化无形资产统计分析工作,以此为基础,提出提高商业银行核心竞争力的基本策略。     

统计代理制的理性探索

基层统计是中国政府统计的基础,提高警惕基层统计质量是提高中国统计数据质量的关键,而建立与社会经济体制相适应的基层统计管理制度又是提高基层统计质量的根本保证.在社会主义市场经济体制下,我国基层统计环境发生了全新变化,为了适应新的变化,必须建立基层统计代理制,基层统计代理制是统计经济成分多元化,社会分工细化,统计利益市场化和统计工作规范化的必然要求 .在我国建立基层统计代理制具有法律可行性,技术档行性和经济可行性.随着统计代理制的实施,我国基层统计的数据来源将会更有保障,数据质量将会稳步提升,工作效率将会大大提高,从而促进我国统计事业兴旺发达.     

关于证券投资技术分析有效性的实证研究

证券投资技术分析是目前在我国沪深股票市场广为流传,且具重大影响力的投资工具,本文运用统计分析理论对其有效性进行实证分析,得到了一些有益的启示。     

Biased Bootstrap Methods for Reducing the Effects of Contamination

Contamination of a sampled distribution, for example by a heavy-tailed distribution, can degrade the performance of a statistical estimator. We suggest a general approach to alleviating this problem, using a version of the weighted bootstrap. The idea is to 'tilt' away from the contaminated distribution by a given (but arbitrary) amount, in a direction that minimizes a measure of the new distribution's dispersion. This theoretical proposal has a simple empirical version, which results in each data value being assigned a weight according to an assessment of its influence on dispersion. Importantly, distance can be measured directly in terms of the likely level of contamination, without reference to an empirical measure of scale. This makes the procedure particularly attractive for use in multivariate problems. It has several forms, depending on the definitions taken for dispersion and for distance between distributions. Examples of dispersion measures include variance and generalizations based on high order moments. Practicable measures of the distance between distributions may be based on power divergence, which includes Hellinger and Kullback–Leibler distances. The resulting location estimator has a smooth, redescending influence curve and appears to avoid computational difficulties that are typically associated with redescending estimators. Its breakdown point can be located at any desired value ε∈ (0, ½) simply by 'trimming' to a known distance (depending only on ε and the choice of distance measure) from the empirical distribution. The estimator has an affine equivariant multivariate form. Further, the general method is applicable to a range of statistical problems, including regression.     

范德瓦尔斯方程的统计解释

本文用统计的方法导出范德瓦尔斯方程及修正值的具体表达式,并讨论修正量与状态量的关系,给出刚性球分子对气体体积、压强所造成的影响.     

A metadata approach to statistical query processing

Concerning the task of integrating census and survey data from different sources as it is carried out by supranational statistical agencies, a formal metadata approach is investigated which supports data integration and table processing simultaneously. To this end, a metadata model is devised such that statistical query processing is accomplished by means of symbolic reasoning on machine-readable, operative metadata. As in databases, statistical queries are stated as formal expressions specifying declaratively what the intended output is; the operations necessary to retrieve appropriate available source data and to aggregate source data into the requested macrodata are derived mechanically. Using simple mathematics, this paper focuses particularly on the metadata model devised to harmonize semantically related data sources as well as the table model providing the principal data structure of the proposed system. Only an outline of the general design of a statistical information system based on the proposed metadata model is given and the state of development is summarized briefly.     

EMPIRICAL INFLUENCE FOR ROBUST SMOOTHING

A simple graphical method is presented to display the sensitivity of a scatter plot smoother (e.g. loess, kernel smoothers) to perturbations in the data. This enables the robustness of smoothers which have been designed to be robust to be examined directly in particular examples. Graphs are shown of various robust smoothers on several standard datasets, so that the robustness of the smoothers can be compared. The method is found to be useful in revealing features of the smoothers. Related graphs for displaying the sensitivity of a smoother to k > 1 outliers are also presented.     

Polygynists and Their Wives in Sub-Saharan Africa: An Analysis of Five Demographic and Health Surveys

Differential polygyny in Ghana, Kenya, Senegal, Uganda, and Zambia is investigated using individual-level Demographic and Health Surveys data. As well as contrasting polygynists' first wives with women in monogamous unions, the analysis distinguishes higher-order wives from first wives. This permits study of the determinants of the prevalence and intensity of polygyny respectively. Polygyny and other aspects of marriage interlock in very similar ways in all five countries. Individuals' experience of polygyny tends to reflect their luck in the marriage market rather than their socio-economic characteristics. While polygyny is less prevalent in urban areas, other socio-economic factors are important only in Kenya and Zambia, the two countries where less than 25 per cent of married women are in polygynous unions. The prevalence and intensity of polygyny are negatively associated. Thus, any drop in the prevalence of polygyny in Africa may be accompanied by a rise in the number of wives per polygynist.