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21.
In many conventional scientific investigations with high or ultra-high dimensional feature spaces, the relevant features, though sparse, are large in number compared with classical statistical problems, and the magnitude of their effects tapers off. It is reasonable to model the number of relevant features as a diverging sequence when sample size increases. In this paper, we investigate the properties of the extended Bayes information criterion (EBIC) (Chen and Chen, 2008) for feature selection in linear regression models with diverging number of relevant features in high or ultra-high dimensional feature spaces. The selection consistency of the EBIC in this situation is established. The application of EBIC to feature selection is considered in a SCAD cum EBIC procedure. Simulation studies are conducted to demonstrate the performance of the SCAD cum EBIC procedure in finite sample cases. 相似文献
22.
陈天佑 《佛山科学技术学院学报(社会科学版)》2012,30(1):66-69
曹丕《典论·论文》的写作时间有建安十六年、太子时期、黄初初年前后三说。分析文献及史实,可以发现它的写作时间应该在太子时期,因其创作与《与吴质书》、《与杨德祖书》关系密切,而《隋书·经籍志》对当时书籍存世的记载对确定该文的创作时间下限也有着不可忽视的作用。经过史实研究,可以精确地将《典记·论文》创作时间定位于建安二十二年(217)年十月至建安二十三(218)年二月三日之间。 相似文献
23.
高等学校文科教材《中国历代文学作品选》自 196 3年初版 ,经 1980年再版 ,迄今已将近 4 0年之久 ,不仅现仍为全国高等学校文科通用教材 ,也被普遍列为研究生入学考试指定参考书。在中国古代文学教学中 ,其地位举足轻重。然白璧或有微瑕。细审该教材唐代文学部分 (中编第一册 )、宋代文学部分 (中编第二册 )计 2 0处注释 (含 1[解题 ]) ,或有其误需正 ,或有其缺需补。 相似文献
24.
This expository paper explains the philosophy of the indifference-zone approach and the subset-selection approach to ranking and selection procedures. It includes examples of operating characteristic curves and data applications for selection problems based on the binomial and normal distributions. A variety of different models and goals are provided with a list of references. 相似文献
25.
The mutual influence of smoking behavior and friendships in adolescence is studied. It is attempted to disentangle influence and selection processes in reciprocal and non-reciprocal friendships. An actor-based model is described for the co-evolution of friendship networks and smoking behavior. This model considers alternative selection and influence mechanisms, and models continuous-time changes in network and behavior. The data consists of a longitudinal sample of 1326 Finnish adolescents in 11 high schools. Findings suggest that selection as well as influence processes play an important role in adolescent smoking behavior. Selection had a relatively stronger role than influence, in particular when selecting non-reciprocal friends. The strength of both influence and selection processes decreased over time. 相似文献
26.
把岭回归的原理和方法应用到家畜性状的选择指数中 ,提出了广义岭选择指数 ,理论和实践证明的这一指数形式在一定意义上优于传统的选择指数。也可以说 ,它在一定意义上丰富了选择指数的理论 ,但不能代替经典的选择指数 相似文献
27.
渠道冲突管理的"生命周期观"——机会主义及其治理机制 总被引:2,自引:1,他引:2
渠道冲突管理是营销研究的热门课题之一.遗憾的是,文献对于渠道冲突管理的分析都是以结果为导向,忽视了对渠道冲突的前因分析,也没有树立渠道冲突管理的全程意识.本文指出,机会主义是渠道冲突的直接前因,必须引入渠道冲突的全程管理.机会主义治理的渠道冲突观认为,渠道关系初期进行渠道成员选择,渠道关系持续期谋求长期导向、互动、协商、开放的渠道关系,可以确保渠道冲突管理树立全程的"生命周期观".本文结合中国市场渠道中机会主义的渠道冲突案例进行剖析,为如何进行机会主义治理、杜绝渠道冲突之源,保持渠道和谐提供了新的视角. 相似文献
28.
In industrial purchasing contexts firms often procure a set of products from the same suppliers to benefit from economies of scale and scope. These products are often at different stages of their respective product life cycles (PLCs). Firms consider multiple criteria in purchasing such products, and the relative importance of these criteria varies depending on the PLC stage of a given product. Therefore, a firm should select suppliers and choose sourcing arrangements such that product requirements across multiple criteria are satisfied over time. The extant models in sourcing literature for evaluating and selecting suppliers for a portfolio of products have not considered this important and practical issue faced by firms. This article proposes a mathematical model that effectively addresses this issue and contributes to the sourcing literature by demonstrating an approach for optimally selecting suppliers and supplier bids given the relative importance of multiple criteria across multiple products over their PLC. The application of the model on a hypothetical data set illustrates the strategic and tactical significance of such considerations. 相似文献
29.
A number of highly publicized, controversial lapses in social responsibility within global supply chains have forced managers and scholars to reexamine long‐held perspectives on supplier selection. Extending Carter and Jennings’ department‐level study of purchasing social responsibility, our research assesses the role of supply managers’ ethical intentions and three key antecedents that drive socially responsible supplier selection. Comparing evidence from firms operating in China, the United States, and the United Arab Emirates, we identify three key drivers of supply managers’ ethical intentions and examine both their direct and indirect impacts on socially responsible supplier selection. We find differential support for the predictor relationships on supply manager ethical intentions across national contexts and mediated versus nonmediated models. These observations bear important implications for firms conducting global supply management. 相似文献
30.
The main goal of the paper is to specify a suitable multivariate multilevel model for polytomous responses with a non-ignorable
missing data mechanism in order to determine the factors which influence the way of acquisition of the skills of the graduates
and to evaluate the degree programmes on the basis of the adequacy of the skills they give to their graduates. The application
is based on data gathered by a telephone survey conducted, about two years after the degree, on the graduates of year 2000
of the University of Florence. A multilevel multinomial logit model for the response of interest is fitted simultaneously
with a multilevel logit model for the selection mechanism by means of maximum likelihood with adaptive Gaussian quadrature.
In the application the multilevel structure has a crucial role, while selection bias results negligible. The analysis of the
empirical Bayes residuals allows to detect some extreme degree programmes to be further inspected. 相似文献