A Computer Program to Improve LR Tests for Generalized Linear Models

Generalized linear models enable the fitting of models to a wide range of data types. These models are based on exponential dispersion distributions. Improved likelihood ratio tests for these models were developed by Cordeiro (1983 Cordeiro , G. M. (1983). Improved likelihood ratio statistics for generalized linear models. Journal of the Royal Statistical Society, Series B: Methodological 45:404–413. [Google Scholar])Cordeiro (1987 Cordeiro , G. M. ( 1987 ). On the corrections to the likelihood ratio statistics . Biometrika 74 : 265 – 274 .[Crossref], [Web of Science ®] , [Google Scholar]). We present a simple R program source for calculating Bartlett corrections to improve likelihood ratio tests in these models. The program was tested on some special models, confirming all of the previously reported numerical results for the Bartlett corrections.     

Bayesian Inference of Odds Ratios in Misclassified Binary Data with a Validation Substudy

We propose a fully Bayesian model with a non-informative prior for analyzing misclassified binary data with a validation substudy. In addition, we derive a closed-form algorithm for drawing all parameters from the posterior distribution and making statistical inference on odds ratios. Our algorithm draws each parameter from a beta distribution, avoids the specification of initial values, and does not have convergence issues. We apply the algorithm to a data set and compare the results with those obtained by other methods. Finally, the performance of our algorithm is assessed using simulation studies.     

Testing the Lack-of-Fit of Zero-Inflated Poisson Regression Models

A zero-inflated Poisson regression model has been widely used for the effect of a covariate in count data containing many zeros with a linear predictor. To assess the adequacy of the linear relationship, we approximate the covariate effect with cubic B-splines. The semiparametric model parameters are estimated by maximizing the likelihood function through an expectation-maximization algorithm. A log-likelihood ratio test is then used to evaluate the adequacy of the linear relation. A simulation study is conducted to study the power performance of the test. A real example is provided to demonstrate the practical use of the methodology.     

Simultaneous Tests for Independence Among Components of Random Vector by Step-Down Multiple Comparison Procedure

In this article, we consider testing independence among components of random vector in multivariate normal population. For testing independence, we use the modified likelihood ratio test statistic which is improved an approximation to χ² distribution of the likelihood ratio test statistic. In order to perform simultaneous tests for independence among components of random vector, we use the step-down multiple comparison procedure based on the closed testing procedure proposed by Marcus et al. (1976 Marcus , R. , Peritz , E. , Gabriel , K. R. ( 1976 ). On closed testing procedures with special reference to ordered analysis of variance . Biometrika 63 : 655 – 660 .[Crossref], [Web of Science ®] , [Google Scholar]). Finally, we perform Monte Carlo simulations and present numerical results.     

哈尔滨市土地储备风险评价研究

以哈尔滨市区土地储备为研究对象,按照研究区土地利用布局均匀采取样点,引用数学模型定量计算各样点的风险值。根据风险值的大小将土地储备风险划分为Ⅰ级、Ⅱ级、Ⅲ级三个等级,并分析造成地块风险差异的原因,提出通过增强土地市场的透明度、确定合理的土地储备量、采用多渠道的经营方式和完善土地储备投资的风险分析等措施,降低哈尔滨市土地储备风险。     

我国城乡收入差距周期性波动的来源分解

测算了1978年来我国城乡收入差距,并以收入来源分解基尼系数法对其增量进行了分解。研究表明,受改革进程和宏观政策的影响我国城乡差距表现出很强的周期性波动;体制变革促使城乡居民分项收入比重变化引起的结构性效应推动城乡差距长期上升,为缓解改革中的偏差采取的调整性政策使各分项收入在城乡间分布发生变化的分配性效应曾两次促使城乡差距短期缩小;综合两种效应分析,二元体制下的工资性收入和转移性收入对城乡差距贡献最大,对此做了实证分析并给出了政策性建议。     

从生物医学类英文期刊的文献计量指标分析其国际化现状及问题

随着科技发展和经济全球化,我国科技期刊的国际化要求也越来越迫切。文章从生物医学英文期刊这一特定的期刊群体出发,分析其2006年-2008年海外论文比的变化．结合总被引频次,影响因子等其他文献计量指标,探讨目前国内生物医学英文期刊国际化的水平和面临的问题。     

国际贷款利率水平对我国贷款利率水平影响的实证检验

在开放经济条件下,跨国公司在全球进行融资时会比较各国融资成本,因此,各国的贷款利率之间存在一定的联系,各国利率之间存在内在联系。文章对美国国内贷款利率与中国国内贷款利率进行了协整分析,通过实证检验发现,由于中国经济实际开放性所限,中国国内贷款利率水平受国际贷款利率影响存在三个月左右的时滞。此外,在我国汇率改革之前,我国贷款利率与国外贷款利率之间关系微弱。但是,自从我国进行汇改之后,我国贷款利率与国外贷款利率之间关系紧密,两者之间存在格兰杰因果关系。      

土地发展权价格测算初探

土地作为一种稀缺的不可再生的自然社会经济资源,对其合理利用能促进经济社会的持续发展。西方国家通过设置土地发展权有效地保护农业用地、公共活动空地和自然保护区,取得了很好的经济、社会、生态效益。近年来我国一些学者也开始研究土地发展权,但主要侧重于土地发展权的归属、配置、流转,而很少涉及土地发展权价格的研究。在市场经济条件下,价格作为市场配置资源的重要信号,对资源合理有效配置起着方向性的重要作用。文章系统地论述了土地发展权的价值构成、价格影响因素及土地发展权价格形成机理,最后建立土地发展权测算方法。     

性别失衡治理工具选择模型的实证研究——以国家“关爱女孩行动”43个试点县区为例

以"关爱女孩行动"43个试点县区的公共治理工具的实践和治理成效为基础,应用公共治理理论和政策工具选择理论,总结和建立了县区级性别失衡治理工具的选择模型;在对治理工具分类的基础上,发现了治理工具类型、外在治理环境和执行有效性间的一般规律;目前,在中国居高不下的出生人口性别比的问题上,其中对不同地区的特征,应采取相关治理工作,使其顺利贯彻执行,计划生育女儿户能够"老有所靠,老有所养。"