抓住90年代的最后商机，化解跨世纪经济增长难题——关于江西农村市场问题的分析研究

随着社会经济的持续、快速发展,我国经济已基本摆脱了短缺状况,市场环境由卖方市场转向买方市场。相伴而来的问题是：主要消费品供过于求,生产能力相对过剩,一些企业的生产经营陷入困境。经济的增长,离不开商品的市场实现。启动市场需求,是克服当前经济运行中各种矛...     

微机管理在基本建设统计中的作用

文章从统计工作必须实现现代化的要求入手,结合本企业实际,论述了计算机和现代通讯技术给统计工作带来的便利.     

On optimising the estimation of high quantiles of a probability distribution

One of the major aims of one-dimensional extreme-value theory is to estimate quantiles outside the sample or at the boundary of the sample. The underlying idea of any method to do this is to estimate a quantile well inside the sample but near the boundary and then to shift it somehow to the right place. The choice of this “anchor quantile” plays a major role in the accuracy of the method. We present a bootstrap method to achieve the optimal choice of sample fraction in the estimation of either high quantile or endpoint estimation which extends earlier results by Hall and Weissman (1997) in the case of high quantile estimation. We give detailed results for the estimators used by Dekkers et al. (1989). An alternative way of attacking problems like this one is given in a paper by Drees and Kaufmann (1998).     

An Extension of Economic Design of x-Bar Control Charts for Non Normally Distributed Data Under Weibull Shock Models

Three parameters—sample size, sampling intervals, and the control limits—must be determined when the x bar chart to monitor a manufacturing process. The constant sampling intervals were widely employed because of its administrative simplicity. However, the variable sampling interval (VSI) has recently been shown to give substantially faster detection of most process shifts than fixed-sampling-interval (FSI) for x-bar charts. In addition, these measurements in the subgroup are assumed to be normally distributed. That assumption may not be tenable. This investigation compares the economic design of x-bar control charts for non normal data under Weibull shock models with various sampling avenues.     

Likelihood Ratio Order of m-Spacings in Multiple-Outlier Models

This article deals with the multiple-outlier exponential model. The likelihood ratio order between m-spacings of the combined sample is developed, some results extend the conclusions on simple spacings in Wen et al. (2007 Wen , S. , Lu , Q. , Hu , T. ( 2007 ). Likelihood ratio order of spacings of heterogeneous exponential random variables . J. Multivariate Anal. 98 : 743 – 756 .[Crossref], [Web of Science ®] , [Google Scholar]).     

Conditional variance estimation in heteroscedastic regression models

First, we propose a new method for estimating the conditional variance in heteroscedasticity regression models. For heavy tailed innovations, this method is in general more efficient than either of the local linear and local likelihood estimators. Secondly, we apply a variance reduction technique to improve the inference for the conditional variance. The proposed methods are investigated through their asymptotic distributions and numerical performances.     

乡村振兴视域中的农民主体作用、制约因素及路径选择——基于湖南岳阳乡村的调查与思考

农民是农业和农村的主体,也是乡村振兴的内生因素,发挥农民主体作用对实施乡村振兴战略意义重大。当前农民对乡村振兴关注度和支持度较高,农民的主体作用发挥成为乡村振兴的根本动力。但现实中,农民主体作用也受到诸如农业综合效益较低、农民自身思想文化和能力素质不高、管理机制滞后及基础条件薄弱等多方面的因素制约,需要党委、政府综合施策,采取完善乡村治理、健全政策扶持、建立引导机制、补齐短板缺陷、加强培育培训等一系列政策措施,尊重、引导、激励和支持农民自我管理、自我发展,激发农民的主动性、积极性、创造性。     

“王若曰”新考

“王若曰”是先秦典籍和金文材料中比较常见的词语。对该词语的释义,目前仍未取得一致意见。通过对金文、简牍和传世典籍中的相关资料进行考察和梳理,可知“王若曰”不是王一般的谈话,而主要是指王命,语感在强调其庄严性。此外,学者以往举出的殷墟甲骨文中“王若曰”的例证并不可靠,从现有材料来看,“王若曰”可能是周人的说法。     

Co掺杂SnO_2纳米粉的微结构和磁学性质

采用湿化学方法制备了Co掺杂的二氧化锡纳米粉(Sn1-xCoxO2),经研究发现,Co以离子形式存在,而不是以单质形式存在,样品中除了金红石型的SnO2相之外,没有发现其他杂质的相,随着Co掺杂含量的增加,晶粒尺寸减小,光吸收谱红移,禁带宽度线性下降。钴离子磁矩随掺杂含量的增加而减小,这可能是由于占据晶格上近邻阳离子位置的磁性离子数目增加使磁性离子成反铁磁性排列的结果。