The marked empirical process to test nonlinear time series against a large class of alternatives when the random vectors are nonstationary and absolutely regular

In this paper, we propose a method for testing absolutely regular and possibly nonstationary nonlinear time-series, with application to general AR-ARCH models. Our test statistic is based on a marked empirical process of residuals which is shown to converge to a Gaussian process with respect to the Skohorod topology. This testing procedure was first introduced by Stute [Nonparametric model checks for regression, Ann. Statist. 25 (1997), pp. 613–641] and then widely developed by Ngatchou-Wandji [Weak convergence of some marked empirical processes: Application to testing heteroscedasticity, J. Nonparametr. Stat. 14 (2002), pp. 325–339; Checking nonlinear heteroscedastic time series models, J. Statist. Plann. Inference 133 (2005), pp. 33–68; Local power of a Cramer-von Mises type test for parametric autoregressive models of order one, Compt. Math. Appl. 56(4) (2008), pp. 918–929] under more general conditions. Applications to general AR-ARCH models are given.     

A power study of k-linear-r-ahead recursive residuals test for change-point in finite sequences

A change-point problem in finite sequences is considered along with, so-called, k-linear-r-ahead recursive residuals and a test procedure proposed by ?o?a¸d? et al. [?o?a¸d?, J.A., Szkutnik, Z., Majerczak, J. and Duda, K. 1998, Detection of change point in oxygen uptake during an incremental exercise test using recursive residuals: relationship to the plasma lactate accumulation and blood acid base balance. European Journal of Applied Physiology, 78, 369–377.]. Theoretical significance levels of that (conservative) test are compared with its simulated sizes. Numerical approximations to the powers against various alternatives are given. Properties of the k-linear-r-ahead recursive residuals are described and the consistency of the test is proved, when the noise level goes to zero.     

Residuals and leverages in the linear mixed measurement error models

Residuals are frequently used to evaluate the validity of the assumptions of statistical models and may also be employed as tools for model selection. In this paper, we consider residuals and their limiting properties in the linear mixed measurement error models. Also, we develop types of residuals for these models and then review some of the residual analysis techniques. Further, by using the definition of generalized leverage, we derive generalized leverage matrices for identification of high-leverage points for these models. Finally, we analyse a real data set.     

“鼓藏节”祭鼓考

"鼓藏节"的本义就是"同社苗人过节以祭祀一节木鼓"。按照苗族传统,这节木鼓必须用枫香树制作,所以祭鼓就是祭祀枫香树生出的苗族祖神"蝴蝶妈妈"。同时,鼓与"日"通,而以鼓祭"日"肯定与稻作有关,由此我们也可以断定,"鼓藏节"是在稻作文化背景下产生的节日。另外,"鼓藏节"的开鼓仪式始终在模拟两性交合,这一点也反映出"鼓藏节"所祈求的"生产性"。     

非均匀分布式星载雷达栅瓣抑制技术研究

分布式星载雷达突破了单星雷达受功率孔径积的限制,具有更远的探测距离;突破了单星雷达受天线基线长度的限制,具有更窄的波束宽度,但是会产生较多的孔径干涉栅瓣.文中研究了一种分布式星载雷达的栅瓣抑制方法,该方法采用遗传算法来确定超稀疏的非均匀分布式星载雷达阵列的位置矢量,利用个体的实值编码提高了遗传算法的计算效率.＃在给定卫星阵列基线长度和卫星间最小间距约束的条件下,通过仿真实验验证了该方法抑制栅瓣的有效性.卫星个数越多,栅瓣抑制效果越好.随着小卫星技术的发展以及小卫星成本的降低,文中基于非均匀分布阵列的栅瓣抑制方法对小卫星的分布设计具有一定的参考价值.     

On a tobit–Birnbaum–Saunders model with an application to medical data

The tobit model allows a censored response variable to be described by covariates. Its applications cover different areas such as economics, engineering, environment and medicine. A strong assumption of the standard tobit model is that its errors follow a normal distribution. However, not all applications are well modeled by this distribution. Some efforts have relaxed the normality assumption by considering more flexible distributions. Nevertheless, the presence of asymmetry could not be well described by these flexible distributions. A real-world data application of measles vaccine in Haiti is explored, which confirms this asymmetry. We propose a tobit model with errors following a Birnbaum–Saunders (BS) distribution, which is asymmetrical and has shown to be a good alternative for describing medical data. Inference based on the maximum likelihood method and a type of residual are derived for the tobit–BS model. We perform global and local influence diagnostics to assess the sensitivity of the maximum likelihood estimators to atypical cases. A Monte Carlo simulation study is carried out to empirically evaluate the performance of these estimators. We conduct a data analysis for the mentioned application of measles vaccine based on the proposed model with the help of the R software. The results show the good performance of the tobit–BS model.     

大数据环境下双层分布式融合决策方法

为了解决大数据环境下双层分布式决策中存在的决策推理难题和信息冗余难题,基于该类决策中存在的参与主体庞杂性和业务关系交叉性分析给出了有关推断信息之间存在相关性的假设,并结合证据理论中的基本概率分配函数提出了具有柔性表达优势的推断信息描述机理,在此基础上分别针对上下两层部门构建了能够剔除管理者影响、上层部门影响且可以对部门内部所有决策主体的元推断信息进行科学融合的定理和推论,最后按照"由上至下"的决策秩序构建了大数据环境下双层分布式融合决策的方法步骤。数值对比分析结果表明提出方法具有科学性和可行性,有利于拓展大数据环境下组织管理决策问题的解决思路,探索处理不完备性数据、相关性数据的"大"模式。     

存在自相关时检验和估计方法的改进——基于自回归分布滞后模型的自相关检验和参数估计

存在自相关时的自相关检验和参数估计是基础计量经济学的一个重要内容,并且存在自相关时的原模型已转化为自回归分布滞后模型。讨论存在自相关时的自相关检验和参数估计问题,提出了一种基于自回归分布滞后模型的自相关检验法,并同时给出了相应的参数估计。     

分布式创新中的知识网络构建

在回顾现有分布式创新概念的基础上,给出分布式创新的一般定义,并指出分布式创新知识网络的意义和网络构建障碍。依据管理支持和受益主体2个维度,划分出分布式知识网络的4种类型:个人爱好网络、专业学习网络、最佳实践网络和商机网络。基于对国内企业调研分析和国内外文献研究,提出构建分布式创新知识网络的4个重要阶段,即聚焦知识网络、创建网络背景关系、网络活动惯例化和利用网络成果。     

Trade openness and manufacturing growth in Malaysia

This study investigates the long-run relationship between trade openness and manufacturing growth and further assesses the causal relationship between these variables. Contrary to some scholars belief that at national level, openness does not contribute to growth in Malaysia, our sector specific analysis suggest otherwise. In this aspect, we believe that in any attempt to establish relationship between openness and growth, the analysis should be sector specific since it is more relevant as well as assures a meaningful insight for policy makers. The results suggest that in the long-run, trade openness is positively related to manufacturing growth in Malaysia. Furthermore, the results also suggest that openness should be viewed as the long term policy initiative for the sector to benefit. Therefore, the policy direction for Malaysian manufacturing sectors should focus on long term trade openness policies. Nevertheless, to ensure sustainability, emphasis should be placed on how (which manufacturing sub-sectors) or when openness is actually important. Importantly, policy makers and scholars should understand that leveraging the benefits of openness also depend on whether the liberalized sector has the comparative advantage.