A comparison of estimators for the mean in the inverse gaussian distribution with a known coefficient of variation

In this paper, we discuss an estimation problem of the mean in the inverse Gaussian distribution with a known coefficient of variation. Two types of linear estimators for the mean, the linear minimum variance unbiased estimator and the linear minimum mean squared error estimator, are constructed by using the squared error loss function and their properties are examined. It is observed that, for small samples the performance of the proposed estimators is better than that of the maximum likelihood estimator, when the coefficient of variation is large.     

Comparison of renewal function estimators for censored data

The computation of the renewal function when the distribution function is completely known has received much attention in the literature. However, in many cases the form of the distribution function is unknown and has to be estimated nonparametrically. A nonparametric estimator for the renewal function for complete data was suggested by Frees (1986). In many cases, however, censoring of the lifetime might occur. We shall present parametric and nonparametric estimators of the renewal function based on censored data. In a simulation study we compare the nonparametric estimators with parametric estimators for the Weibull and lognormal distribution. The study suggests that the nonparametric estimator is a viable alternative to the parametric estimators when the lifetime distribution is unknown. Also, the nonparametric estimator is computationally simpler than the parametric estimator.     

Least-squares estimation of distribution functions in johnson's translation system

To summarize a set of data by a distribution function in Johnson's translation system, we use a least-squares approach to parameter estimation wherein we seek to minimize the distance between the vector of "uniformized" oeder statistics and the corresponding vector of expected values. We use the software package FITTRI to apply this technique to three problems arising respectively in medicine, applied statistics, and civil engineering. Compared to traditional methods of distribution fitting based on moment matching, percentile matchingL ₁ estimation, and L _? estimation, the least-squares technique is seen to yield fits of similar accuracy and to converge more rapidly and reliably to a set of acceptable parametre estimates.     

概率抽样条件下样本代表性事后评估方法探讨

 样本代表性直接牵扯到统计数据质量和统计公布引起的民众反响,目前社会上不乏对政府统计数据的质疑之声,最终影响到政府统计机关的公信力,因此有必要重新审视现行样本代表性的研究。目前相关文献普遍强调不同抽样方式下的样本代表性的相对性内涵,确保样本的代表性仅从抽样方法和样本量两个维度入手,缺乏对既定抽样方法下样本代表性的事后评估体系的探索,以及多样本之间样本代表性优劣的比较方法研究。鉴于此,本文在结合人口普查数据基础上尝试从样本-总体整体分布和内部属性结构两个方面构建样本代表性事后评估的一整套指标和假设检验,进而找到一种多样本代表性比较的依据。最后对浦东新区2010年城镇居民收入调查样本进行了代表性检验的尝试。     

The complex Watson distribution and shape analysis

The complex Watson distribution is an important simple distribution on the complex sphere which is used in statistical shape analysis. We describe the density, obtain the integrating constant and provide large sample approximations. Maximum likelihood estimation and hypothesis testing procedures for one and two samples are described. The particular connection with shape analysis is discussed and we consider an application examining shape differences between normal and schizophrenic brains. We make some observations about Bayesian shape inference and finally we describe a more general rotationally symmetric family of distributions.     

京津冀城市群人口空间结构演变及优化路径研究

人口的流动和分布直接影响着城市群城镇体系的质量,进而影响着城市群经济社会的可持续协调发展。文章从人口分布的空间差异、动态变化以及空间格局三个层面探讨了京津冀城市群人口分布演化特征;基于中心地理论和新经济地理理论,从行政、经济、交通三个角度构建了城市人口规模分布演化影响因素分析框架,利用Zipf法则对2003～2013年京津冀城市群人口演化规律进行研究。结果表明,城市行政级别、人力资源水平、经济结构、交通建设等因素对京津冀城市群人口规模分布影响显著。基于此,提出应当通过公共服务均等化、城市技能互补、产业布局优化、交通网络建设完善等对策引导京津冀地区人口合理布局的建议,助推京津冀协同发展重大战略的实施。     

中国对外直接投资逆向技术溢出的境外地区分布差异性研究

基于中国对外直接投资的不同境外地区分布,测算了来自不同类型国家(地区)的R&D溢出;然后运用DEA方法计算出中国平均生产率(Malmquist指数)、技术效率(EC指数)和技术进步(TC指数),并与不同类型国家所产生的逆向技术溢出进行灰色关联分析。得到以下结论:中国对新兴国家(地区)直接投资的逆向技术溢出效果最好,其次是发达国家(地区),最后是其他发展中国家(地区);中国平均全要素生产率及其分解指数与外国研发溢出呈中等关联度,其中,与来自新兴国家(地区)、发达国家(地区)的逆向技术溢出关联度较强,而与来自其他发展中国家(地区)的逆向技术溢出关联度则较低。因此,中国应调整对外直接投资的海外布局,在巩固新兴国家(地区)市场份额的基础上,开始向发达国家(地区)倾斜。     

新疆哈萨克族人口规模变迁及分布

研究民族产生发展过程中的人口规模变迁及分布情况,将为了解民族历史演变提供新的背景。文章阐述了哈萨克族人口规模变迁和分布的基本内容与历史过程。     

区域人口分布及空间相关性研究——以安徽省为例

通过ARCGIS9.3空间统计平台,结合相关人口指标,利用2000年、2010年安徽省人口普查数据,对安徽省人口分布的全局与局部相关性、人口分布时空演变特征以及人口分布与自然、经济的空间联系进行了实证分析。分析发现,安徽省人口分布存在空间自相关;自然要素,如地形、河流对安徽省人口分布影响较大;人口重心与经济重心的移动轨迹不一致。据此认为,该结论对安徽省的人口经济发展具有对外加大劳动力转移力度,对内加强新农村和家庭农场建设3大启示。     

试论收入分配制度改革与和谐社会建设

改革以来,由于制度不完善,我国收入分配领域存在差距过大,分配不公等问题,成为和谐社会建设的重要制约。建设社会主义和谐社会,需要从市场初次分配、政府主导的再分配以及社会第三次分配等领域深化改革,通过完善分配制度实现充分就业、规范税收体系、调整政府财政支出结构等手段,实现兼顾公平与效率的分配结构,实现社会公平、公正,建设和谐社会。