An Additive–Multiplicative Restricted Mean Residual Life Model

The mean residual life measures the expected remaining life of a subject who has survived up to a particular time. When survival time distribution is highly skewed or heavy tailed, the restricted mean residual life must be considered. In this paper, we propose an additive–multiplicative restricted mean residual life model to study the association between the restricted mean residual life function and potential regression covariates in the presence of right censoring. This model extends the proportional mean residual life model using an additive model as its covariate dependent baseline. For the suggested model, some covariate effects are allowed to be time‐varying. To estimate the model parameters, martingale estimating equations are developed, and the large sample properties of the resulting estimators are established. In addition, to assess the adequacy of the model, we investigate a goodness of fit test that is asymptotically justified. The proposed methodology is evaluated via simulation studies and further applied to a kidney cancer data set collected from a clinical trial.     

论编辑对讯息的社会规范和符号代码规范的把关

大众传播媒介在传播活动中满足社会成员的社会化需求 ,体现了大众传媒的根本价值。社会化的重要内容是社会文化模式的行为规范 ,包括社会规范和技术规范。传媒有责任对讯息进行社会规范和语言符号代码规范的严格把关 ,以保证讯息传播社会所期望的价值观 ,并使受众顺利获得信息内容和学习语言符号交流技能     

用SOR迭代法求解Poisson方程的误差检验

通过Ｐｏｉｓｓｏｎ方程第一类边值问题差分解的Ｊａｃｏｂｉ迭代法误差检验公式，推导出了ＳＯＲ迭代法误差检验公式。计算机上模拟结果表明它与理论分析的一致性。     

延边对朝、俄贸易与经济增长实证分析

延边与朝鲜、俄罗斯毗邻,对朝、俄贸易在延边对外贸易中占据重要地位。利用1989-2008年的统计数据对延边出口贸易、进口贸易、经济增长进行实证分析,对变量之间进行协整检验并建立误差修正模型,结果表明,从长期来看,延边对朝、俄出口与GDP、进口之间存在着长期稳定的关系;GDP和对朝、俄出口也存在着长期的均衡关系。从短期来看,对朝、俄出口与GDP、进口以及GDP与对朝、俄出口的长期关系都出现了偏离,修正速度较慢。此外,GDP和对朝、俄进口不存在双向的因果关系。     

Diagnostic Checking for GARCH-Type Models

The asymptotic distributions of squared and absolute residual autocorrelations for GARCH model estimated by M-estimators are derived. Two diagnostic tests are developed which can be used to check the adequacy of GARCH model fitted by using M-estimators. Simulation results show that the empirical sizes of both tests are close to the nominal size in most of the cases. The power of test based on absolute residual autocorrelation is found better than test based on squared residual autocorrelations. Our results reveal that there are estimators that can fit GARCH-type models better than the commonly used quasi-maximum likelihood estimator under non normal errors. An application to real data set is also presented.     

Partial and inverse autocorrelations in portmanteau-type tests for time series

We present a decomposition of the correlation coefficient between x_t and x_t?k into three terms that include the partial and inverse autocorrelations. The first term accounts for the portion of the autocorrelation that is explained by the inner variables {x_t?1 , x_t?2 , …, x _{t? k+1}}, the second one measures the portion explained by the outer variables {x _t+1, x _t+2, } ∪ {x _t?k?1, x _t?k?2,…} and the third term measures the correlation between x _t and x_t?k given all other variables. These terms, squared and summed, can form the basis of three portmanteau-type tests that are able to detect both deviation from white noise and lack of fit of an entertained model. Quantiles of their asymptotic sample distributions are complicated to derive at an adequate level of accuracy, so they are approximated using the Monte Carlo method. A simulation experiment is carried out to investigate significance levels and power of each test, and compare them to the portmanteau test.     

话题结构中ATB移位现象的最简探索

在英语并列疑问句中,存在着ATB(Across the Board)移位现象。汉语作为Wh in situ的语言,不允许疑问词提升。但是通过对实际的语料分析发现,在汉语某些宾语前置的话题结构中,同样存在着ATB式移位。文章通过分析这些结构的句法特征和生成机制,证明了在汉语中同样存在着ATB移位现象,并通过对比不同语言中话题化结构的特点,进而证明了ATB移位具有跨语言的普遍特性。     

最简方案框架下的中间结构研究

结合中间结构的结构特征和词汇观和句法观,中间动词是潜在的及物动词。基于Chom sky（1995）和Bowers（2002）,中间结构的推导是受形态特征核查要求所驱动：功能语类Tr、Pr和T的φ特征吸引动词V和它们合并;Tr、Pr和T的EPP特征,Tr和T的格特征,吸引限定词组DP,通过循环移动方式,前移到它们标识语Spec位置。只有以上所有无解特征全部被核查,整个推导才算集合。在Tr和Pr的作用下,及物动词发生了变异：失去了分派外部题元角色和核查宾格的能力,内部题元只能前移到[Spec,TP]位置。     

秦律禀漆释义

秦简《效律》中有关于禀漆的规定 ,目前在理解上存在疑义 ,有人认为是质量检验条款 ,本文认为应是数量损耗的罚则     

Improvements over the duplicate performance method for outlier detection in categorical multivariate surveys

Summary The detection of errors and outliers is an important step in data processing, especially those errors arising from data entry operations because they are of the entire responsability of the data processing staff. The duplicate performance method, is commonly used as an attempt to detect such type of errors. It implies typically typing twice the same data without any special precedence. If the errors are uniformly distributed among individuals, retyping a fraction of the total will also remove typically the same fraction of the errors. A new method is presented, which is able to improve that procedure by sorting the records putting first the most unlikely ones. The ability of the present methodology has been tested by a Monte Carlo simulation, using an existing database of categorical answers of housing characteristics in Uruguay. At first, it has been randomly contaiminated, and after that, the proposed procedure applied. The results show that if a partial retyping is done following the proposed order about 50 % of the errors can be removed while keeping the retyping effort between 4 and 14% of the dataset, while to attain a similar result with the standard methodology 50% (on, average) of the database should be processed. The new ordering is based upon the unrotated Principal Component Analysis (PCA) transformation of the previously coded data. No special shape of the multivariate distribution function is assumed or required.