Catalogue of Group Structures for Three-level Fractional Factorial Designs

Taguchi (1959) introduced the concept of split-unit design to sort the factors into different groups depending upon the difficulties involved in changing the levels of factors. Li et al. (1991) renamed it as split-plot design. Chen et al. (1993) have given a catalogue of small designs for two- and three-level fractional factorial designs pertaining to a single type of factors. Aggarwal et al. (1997) have given a catalogue of group structure for two-level fractional factorial designs developed under the concept of split-plot design. In this paper, an algorithm has been developed for generating group structure and possible allocations for various 3^n-k fractional factorial designs.     

中国加入八国集团研究

八国集团对世界事务的影响举足轻重,中国对于是否加入八国集团表现的顾虑重重。究其原因,一是担心八国集团会架空联合国;二是中国考虑到自己是一个发展中国家,而八国集团从本质上来说是一个富国俱乐部;三是八国集团曾经在1989年制裁过我们。但是,我们加入八国集团却有许多好处:一是可以更好的改善中美关系;二是可以吸引和争取更多的投资和贷款;三是可以从八国集团的内部影响八国集团的决策;四是符合我们的大国外交战略。相反,如果我们长期远离八国集团,就可能在将来被边缘化。在加入的方式上,中国可以先以观察员的身份列席八国首脑会议,等待合适时机,正式加入。     

论构成艺术的实质

本文阐述了具象与抽象在构成艺术中的把握和人为地把艺术规律图解化的倾向;构成艺术的具体运用与现代人审美上的后现代情结;构成艺术与图案、图形的关联。     

嵌入式框架iframe在网页设计中的应用研究

本文对嵌入式框架iframe在网页设计中的应用技巧进行了研究。从iframe的一般应用方法入手,给出了嵌入式框架与父框架之间的相互访问方法,结合ASP和数据库实现了网页中两个下拉列表框的动态关联。通过网页实例和代码,对上述方法进行了具体阐述。     

桐城文派"中兴"的一场大气磅礴的"宣言"--曾国藩《欧阳生文集序》析论

曾国藩千字文使日趋衰弱的桐城派回光返照,并由此“中兴”,而名声大振。行文表达创建湘乡派的“心声”,企图重振桐城文雄风。顺应时代剧变的需要,提出“文章与世变相因”文学理论,注入“经国济民”现实内容,以桐城文章来倡导洋务,铸就湘乡派卫道成仁的军魂,使文学发挥其社会功能。全文颇得桐城派作文之精髓,亦体现曾氏为文“气盛”的文章风格。     

Sequential Hypothesis Tests for Identifying the Minimum Dose with a Threshold Effect

We propose a procedure to identify a lowest dose having greater effect than a threshold dose under the assumption of monotonicity of dose mean response in dose response test. So, we use statistics based on contrasts among sample means and apply a group sequential procedure to our procedure to identify effectively the dose. If we can identify the dose at an early step in the sequential test, since we can terminate the procedure with a few observations, the procedure is useful from an economical point of view. In a simulation studies, we compare the superiority among these procedures based on three contrasts.     

Re-Defining the Who,When, and Where of Mentoring for Professional Statisticians

Organizations tailor their mentoring strategies to accommodate internal resources and preferences, producing different approaches in academic, government, and corporate environments. Across these settings, three common barriers impede effective mentoring of statisticians: overspecialization, time constraints, and geographic dispersion. The authors share mentoring strategies that have emerged at their organization, Mathematica Policy Research, to overcome these obstacles. Practices include creating a methodology working group to unite researchers with diverse backgrounds, integrating mentoring into existing workflows, and harnessing modern technological infrastructure to facilitate virtual mentoring. Although these strategies emerged within a specific professional context, they suggest opportunities for statisticians to expand the channels through which mentorship can occur.     

“无直接利益冲突”的网络发生机制

近年来,"无直接利益冲突"现象在我国似乎形成一种所谓"涟漪效应",其产生的深层根源在于社会分配的不公平及与之相联系的群体异质不公平感的普遍存在;其次也与利益表达机制的不畅通有关。在其产生的过程中,事件触发与演化的关联性往往是通过驱动机制、认同机制、社会比较与自我展示机制和说服争辩机制交互作用表现出来的。在信息时代,"无直接利益冲突"的这些相关发生机制往往与网络极化效应直接相关,即"无直接利益冲突"极易导致网络极化效应的产生,而网络极化效应也促使了"无直接利益冲突"的扩散。而这种双向互动的过程,正是"无直接利益冲突"网络发生机制的作用过程。由此,应给予充分重视。     

基于超总体模型的设计效应分解

本文基于超总体模型研究抽样调查中设计效应的计算问题。首先以随机效应模型为基础，明确了简单随机、二阶段、不等概率和分层抽样对应的超总体模型，进而通过所给模型推导出分层、类集、加权单因素设计效应的计算公式和多因素组合的设计效应计算公式并给出了对应估计量，公式表明：多因素同时存在的组合设计效应等于对应单因素设计效应的乘积。最后，对设计效应的理论值、估计值和真实值之间的关系进行了蒙特卡洛仿真，并利用相对偏倚、相对均方误进行了评价。本文的研究，对复杂抽样设计中正确计算、使用设计效应具有指导意义。