Generalized linear mixed models with informative dropouts and missing covariates

Generalized linear mixed models (GLMM) are useful in many longitudinal data analyses. In the presence of informative dropouts and missing covariates, however, standard complete-data methods may not be applicable. In this article, we consider a likelihood method and an approximate method for GLMM with informative dropouts and missing covariates. The methods are implemented by Monte–Carlo EM algorithms combined with Gibbs sampler. The approximate method may lead to inconsistent estimators but is computationally more efficient than the likelihood method. The two methods are evaluated via a simulation study for longitudinal binary data, and appear to perform reasonably well. A dataset on mental distress is analyzed in details.     

滨海新区形成高层次服务产业结构的路径选择

滨海新区欲做到高起点、高层次、高水平发展关键在于充分认识现代服务业在城市经济发展中揪的主导作用,着力构筑高层次产业结构,突显现代服务业的主导地位,选择能够充分发挥后发优势的加快发展现代服务业的路径.     

关于邮政企业人本管理的探讨

文章分析了邮政企业实施人本管理的阻碍因素,提出了因应邮政公司化改革,营造以人为本、积极和谐的人力资源环境,建立健全员工自我管理、自我激励、自我成长的人力资源管理机制。     

基于单亲遗传算法的设施布置问题研究

用单亲遗传算法解决设施布置问题,结合设施布置问题的实际需求,提出了S型的编码顺序和基因修正算子,并在赌盘选择方式的基础上,提出了“多个体最优保持”的改进,使算法可求得多个最优解个体。最后通过算例分析和比较,分析了修正概率算子对算法的影响,验证了修正算子和对单亲遗传算法的改进效果,验证了改进单亲遗传算法的有效性。     

Economic Growth in Canada and the United States: Supply‐Push or Demand‐Pull?

Understanding the nature of structural change and the sources of economic growth of an economy, especially the relative importance of different industries, is essential for policy‐making. This paper estimates industry contribution to economic growth in both Canada and the United States. It argues that industry contribution should be evaluated on the basis of the performance of an industry in terms of creating economic value relative to other industries. In particular, it calls for the quantity and the price effects, which is consistent with real GDP in the chained‐Fisher index that values the industry more when its price rises and less when its price declines. This is an important departure from the traditional methodologies that consider only quantity effect. This paper shows that the contribution from demand‐driven industries is significantly more than the finding based on traditional thinking.     

入世后过渡期我国零售业的现状及发展对策

去年12月11日,我国对零售企业的三年保护期宣告结束,中国零售业全面对外资开放。随着中国零售企业从有保护的竞争阶段走向全面竞争时代,中国巨大的零售市场将出现变局。本文试图从入世后过渡期角度分析探讨我国零售业所面临的新的竞争状况,以期提出新时期中国零售业的发展策略。     

一种基于四相编码和优化阵列的MIMO STAP实现方法

多输入多输出（MIMO）雷达多信号间正交性和天线阵列结构影响空时自适应处理(STAP)性能。为了提高多信号间正交性,提出了基于遗传算法优化提高四相编码的自相关峰值并降低互相关峰值方法,保证了多发射信号间良好正交性,基本抑制了盲速影响。针对天线阵列稀疏导致盲速、阵元密布导致天线孔径过小的问题,基于最大连续孔径思想,提出了一种优化阵列结构,在不显著增加天线阵列长度和阵元数目条件下,与四相编码信号结合,实现了动目标检测。仿真实验证明,基于四相编码正交信号和收发阵列设计,MIMO STAP可实现良好动目标检测性能。