初等r-循环矩阵的几个性质

给出了初等ｒ－循环矩阵可逆的充要条件及逆矩阵的表达式;对奇异的初等ｒ－循环矩阵给出了Ａ的一个ｇ－逆Ｇ（满足ＡＧＡ＝Ａ,ＧＡＧ＝Ｇ）及Ｍｏｏｒｅ－ｐｅｎｒｏｓｅ广义逆矩阵的表达式．     

中国碳排放库兹涅茨曲线存在性研究

经济增长与环境恶化之间的矛盾直接推动了碳排放库兹涅茨曲线的研究。本文基于1995-2009年中国省际碳排放面板数据,利用面板协整和误差修正模型对中国碳排放库兹涅茨曲线的存在性进行实证研究,结果发现：动态固定效应下的面板误差修正模型最优,碳排放与经济增长间存在长期稳定的倒U型关系,拐点为人均国内生产总值29847.29元,且存在短期误差修正机制;与权威机构时序数据回归结果比较,动态面板模型结果具有稳健性。     

Preservation of generalized ageing classes on the residual life at random time

In this paper, we provide some new preservation properties of generalized ageing classes (s-IFR) on the residual life at random time, where s is a nonnegative integer. We also obtain bounds of the residual life at exponential random time. Results are expected to be useful in the reliability, queue theory and actuarial science.     

A new approach to statistical efficiency of weighted least squares fitting algorithms for reparameterization of nonlinear regression models

We study nonlinear least-squares problem that can be transformed to linear problem by change of variables. We derive a general formula for the statistically optimal weights and prove that the resulting linear regression gives an optimal estimate (which satisfies an analogue of the Rao-Cramer lower bound) in the limit of small noise.     

Testing bioequivalence for multiple formulations with power and sample size calculations

Bioequivalence (BE) trials play an important role in drug development for demonstrating the BE between test and reference formulations. The key statistical analysis for BE trials is the use of two one‐sided tests (TOST), which is equivalent to showing that the 90% confidence interval of the relative bioavailability is within a given range. Power and sample size calculations for the comparison between one test formulation and the reference formulation has been intensively investigated, and tables and software are available for practical use. From a statistical and logistical perspective, it might be more efficient to test more than one formulation in a single trial. However, approaches for controlling the overall type I error may be required. We propose a method called multiplicity‐adjusted TOST (MATOST) combining multiple comparison adjustment approaches, such as Hochberg's or Dunnett's method, with TOST. Because power and sample size calculations become more complex and are difficult to solve analytically, efficient simulation‐based procedures for this purpose have been developed and implemented in an R package. Some numerical results for a range of scenarios are presented in the paper. We show that given the same overall type I error and power, a BE crossover trial designed to test multiple formulations simultaneously only requires a small increase in the total sample size compared with a simple 2 × 2 crossover design evaluating only one test formulation. Hence, we conclude that testing multiple formulations in a single study is generally an efficient approach. The R package MATOST is available at https://sites.google.com/site/matostbe/ . Copyright © 2012 John Wiley & Sons, Ltd.     

大力培养适应市场需要的营销生力军——高等职业教育市场营销专业人才需求调研报告

市场经济的浪潮,呼唤大批的市场营销人才。为深化高职市场营销专业的教学改革,实现人才培养模式的创新,培养合格的营销生力军,必须紧密结合市场对营销人才的需求而有的放矢。本文在综合分析商职市场营销专业人才需求调查结果的基础上,针对高职市场营销专业人才需求态势和毕业生在适应人才市场需求方面存在的问题,提出了深化专业教学改革,造就真正适应社会需求的高素质营销人才的建议。     

教师课堂教学质量综合评价方法研究

教师课堂教学质量综合评价以课堂教学质量评价指标体系为基础,综合评价方法主要包括指标加权平均法和模糊综合评价法。难点是评价指标的设计和量化处理,权集的构造。对评价结果的分析可采用绝对评价(等级判断),相对评价,动态评价(个体差异的评价)。     

陕西省工业产业结构的实证分析

研究产业结构的现状与变动有利于正确认识区域经济发展,对经济发展政策的制定起到积极的作用。用总产值、从业人数和总资产贡献率分析了陕西省工业产业结构及变动,同时对近10年来陕西省工业各行业的绩效进行了实证分析。结果表明,陕西省在煤炭开采和洗选业、文教体育用品制造业等行业有明显的比较优势。     

Ratio test for variance change point in linear process with long memory

In this paper we consider the detection problem of variance change point in linear process with long memory. We propose the ratio test to detect the variance change point. The limiting distribution for test statistics under H ₀ is derived and the consistency of the test is also established. In comparison with the existing CUSUM of squares (SCUSUM) test, the ratio test does not need to estimate the long memory parameter in practical situation and therefore it can be used more conveniently.     

统计分析与预测——官方统计不可或缺的重要功能

官方统计机构是否应该从事统计分析与预测工作?如果是,应该怎样从事这项工作?这是一些尚存争议的老问题。从不同视角看此问题,会提出不同的观点。但理论分析和一些国家官方统计机构多年来的实践表明,从事统计分析与预测应该是官方统计机构不可或缺的重要功能,只要能遵循适当的原则,扬长避短,应大胆为之,且大有可为。在经济学日益朝着用数学表达内容和统计定量的方向发展的时代,官方统计机构从事统计分析与预测工作已是势在必然。一、传统认识的局限性所谓统计分析,就是以根据科学的方法收集到的统计数据信息为基础,运用统计学和与被研究对象…