Estimation of population mean in successive sampling under super-population model in presence of random non response situations

The present work is an attempt to estimate the population mean on the current occasion in two-occasion successive (rotation) sampling in presence of random non response situations. The estimation strategy has been constructed under a super-population model design approach with the help of imputation technique. The estimators proposed on the current occasion cover the cases of occurrences random non responses on either of the occasions. Detail behaviors of the proposed class of estimators have been studied and its performance has been examined with the sample mean estimator. The results are demonstrated through empirical studies which establish the effectiveness of the proposed class of estimators. Suitable recommendations have been put forward to the survey statisticians for its practical application.     

对新疆石河子市教育资源优化配置问题的研究

新疆兵团农八师石河子市教育近年来取得了较大的发展,但教育资源使用效率不高、教育供求结构相差悬殊、教育资源总供给与总需求失衡等问题仍然存在,制约了石河子教育、经济、社会的进一步发展。因此进一步分析导致资源配置不合理的关键因素,探索改善和解决教育资源配置问题的途径,非常必要。     

M／G_T／1可修排队系统分析及最优策略

研究服务台可修且按年龄Ｔ维修的Ｍ／Ｇ＿Ｔ／１排队系统。在假定服务台寿命分布为负指数分布，事后修理时间和事前修理时间均有一般分布的条件下，使用分解法，结合更新过程理论，获得系统的排队指标和服务台的可靠性指标，而且在两种不同的目标函数下讨论了服务台的最优维修策略。     

超声全息成象系统及其参数最佳调整

本文讨论了一个超声全息成象系统及其主要参数对图象质量的影响。运用成象理论及其算法建立了最佳参数调整的关系式及基调整方法。本文运用这些关系式和方法,对多种不同类型的目标,如金属、塑料,植物与动物等,进行了超声成象处理,获得了十分良好的结果。     

Asympitic approach to families of desigh problems

Examples are given that demonstrate the usefulness, for obtaining near-optimum designs in analytically intractable settings, of embedding such settings in a regular family of designs whose limit is easier to treat.     

Maximum likelihood and optimum location of observation sites in geodetic and spatial surveying

In geodetic and spatial surveying, accurate statistical es-timates of the Cartesian coordinates of a stationary target depend, in general, on such factors as target position, number and type of instruments, their location, their accuracy, and their mix. Direct measurements are assumed to be made in elevation, azimuth, and range with errors independently and normally distributed. For a mix of instruments, theoretical arguments are established using maximum likelihood estimation to determine the optimal siting of the instruments which minimizes (GDOP)² or the square of the geo-metric dilution of precision = sum of the variances of the estimates in the three orthogonal directions.     

Family income at the bottom and at the top: Income sources and family characteristics

Attention has recently been focused on wealth as a source of long-term economic security and on wealth ownership as a crucial aspect of the racial economic divisions in the United States. This literature, however has been concerned primarily with the wealth gap between poor and middle-class families, and between the white and black middle class. In this paper, we investigate the incomes of families at the top and bottom of the family income distribution. We examine the sources of income and the demographic characteristics of these high-income and low-income families using family level data from the 1988 to 2003 Current Population Surveys.     

粗纺毛织物柔软整理的工艺优化

文章探讨了粗纺毛产品柔软整理工艺的特点，用优化处理的方法对柔软整理的重点工艺参数进行了优化设计，为粗纺毛产品的柔软整理研究提供了依据。     

牲猪销售的最佳时期

为使牲猪饲养者获得最大利润，本文利用数学模型，分析了牲猪销售的最佳时期。     

货币政策区域非对称性效应最新研究进展

有关货币政策区域非对称性效应的讨论是当前货币政策有效性研究的热点问题之一。这种效应的存在对各国货币政策当局带来了严重的挑战。货币政策区域非对称性效应的研究不能仅局限在国际货币联盟中,同样适用于单个国家内部,特别是内部发展差异较大的大国内部。从货币政策区域非对称性效应这一领域相关的成果的基础,对其产生的机制、实证研究、治理机制等角度进一步研究。