中国产业结构变动与就业水平的实证研究

文章运用时间序列和计量模型研究了中国产业结构与就业水平之间的发展关系.首先运用格兰杰因果检验分析了第一、二、三次产业的产值与其就业之间的因果影响关系,继而从产值与就业两个角度定量分析了第一、二、三次产业各自对总就业水平的贡献,得出结论:第一产业和第三产业是劳动力就业的决定因素,而第二产业不是就业的决定因素;从产值角度来看,第三产业对劳动力就业的贡献最大,从就业角度来看,第一产业的就业对总体就业水平的贡献最高,其次是第三产业,而第二产业的就业对总体就业水平的贡献最小.最后根据研究结论提出相应的建议措施.     

我国生产用能源消费变动的分解分析

摘　　要:能源消费分解是探讨能源消费变动影响因素的一种常用方法。在本文中介绍了目前研究中较为合理的一种分解方法——对数平均D氏指数法,并借助这一方法来对我国“六五”时期以来的生产用能源消费情况进行分解分析,探讨产业结构变动和产业内效率提高对能源消费和总体单位能耗的影响。根据测算结果,笔者认为产业内能源效率的提高是我国能源节约的主要因素;进一步建议政府构建“能源分解指数体系”作为制定能源政策的依据。     

基于二值响应模型的房地产泡沫预警方法研究

 本文在总结国内外房地产泡沫预警研究的基础上，论述了二值响应模型在房地产泡沫预警研究中的应用，并以日本为例进行了实证研究。结果表明，二值响应模型在房地产泡沫预警中有比较准确的预测作用。另外，与徐滇庆(2000)的研究不同，有关股市价值的相关变量并不能对房地产泡沫起到明显的预警作用。     

Alternative posterior consistency results in nonparametric binary regression using Gaussian process priors

We establish consistency of posterior distribution when a Gaussian process prior is used as a prior distribution for the unknown binary regression function. Specifically, we take the work of Ghosal and Roy [2006. Posterior consistency of Gaussian process prior for nonparametric binary regression. Ann. Statist. 34, 2413–2429] as our starting point, and then weaken their assumptions on the smoothness of the Gaussian process kernel while retaining a stronger yet applicable condition about design points. Furthermore, we extend their results to multi-dimensional covariates under a weaker smoothness condition on the Gaussian process. Finally, we study the extent to which posterior consistency can be achieved under a general model where, when additional hyperparameters in the covariance function of a Gaussian process are involved.     

1997～2002年中国经济结构变化趋势分析——2002年投入产出表系列分析报告之三

 摘　　要:本文利用1997年、2002年的投入产出表，定理分析了各部门的生产结构、需求结构、进出口结构的变化情况，包括各部门经济规模及其在国民经济中的比重及变化情况。     

当代大学生需要结构研究述评

人的各种活动行为,都是在需要的推动下进行的。随着社会的不断发展和大学生社会主体地位的不断提高,对大学生需要结构的研究得以不断丰富和完善。对于需要的界定、类型的划分见仁见智,通过分析大学生需要结构的测量工具、研究现状等内容,整理出大学生需要结构研究的主要结论,以便对后续研究有所助益。     

Influence of human immunodeficiency virus infection on neurological impairment: an analysis of longitudinal binary data with informative drop-out

A study to investigate the human immunodeficiency virus (HIV) status on the course of neurological impairment, conducted by the HIV Center at Columbia University, followed a cohort of HIV positive and negative gay men for 5 years and assessed the presence or absence of neurological impairment every 6 months. Almost half of the subjects dropped out before the end of the study for reasons that might have been related to the missing neurological data. We propose likelihood-based methods for analysing such binary longitudinal data under informative and non-informative drop-out. A transition model is assumed for the binary response, and several models for the drop-out processes are considered which are functions of the response variable (neurological impairment). The likelihood ratio test is used to compare models with informative and non-informative drop-out mechanisms. Using simulations, we investigate the percentage bias and mean-squared error (MSE) of the parameter estimates in the transition model under various assumptions for the drop-out. We find evidence for informative drop-out in the study, and we illustrate that the bias and MSE for the parameters of the transition model are not directly related to the observed drop-out or missing data rates. The effect of HIV status on the neurological impairment is found to be statistically significant under each of the models considered for the drop-out, although the regression coefficient may be biased in certain cases. The presence and relative magnitude of the bias depend on factors such as the probability of drop-out conditional on the presence of neurological impairment and the prevalence of neurological impairment in the population under study.     

Modelling Variability in the Branching Structure of Strawberry Inflorescences

The branching structure of inflorescences of the cultivated strawberry ( Fragaria × ananassa Duch.) is very variable. This paper demonstrates that some aspects of this variability are well described by a simple stochastic model of branching that has two adjustable parameters. The model is shown to provide a good fit to data from a set of almost 700 inflorescences of the cultivar Elsanta, collected over two successive years. For one parameter the maximum likelihood estimator is a moment estimator which is fully efficient even if the detailed branching structure of the inflorescences is not recorded. This parameter provides a convenient summary of branching vigour. The maximum likelihood estimator of the second parameter must be determined iteratively and can be quite inefficient unless the full branching structure is recorded. The model demonstrates that branching structure is affected by the order in which inflorescences emerge on the plant.     

产业集群企业网络体系:系统建构与结构分析

理论与实践的深入发展迫切要求加强产业集群绩效评价及其比较的定量研究,而集群企业网络体系及其结构分析是集群绩评价的基础和难点。本文运用系统论和社会网络分析工具,对集群企业网络体系系统建构和结构分析做了一个初步的探索性研究,认为集群企业网络体系是集群系统的核心层次,其结构特征可以通过网络密度、网络连通性、群体中心性、小团体结构和规则同型性等变量进行刻画,并具体阐释了各变量的分析方法及其对于集群企业网络分析的意义。     

小议带引导词there的句子

本文着重探讨“ Ｔｈｅｒｅ ＋ ｂｅ ＋ 名词词组（ ＋ 状语）”结构的某些特殊用法,尤其是该结构在非正式文体中及在方位句、存在句和状态句中的特殊用法