Test inversion bootstrap confidence intervals

In this paper we explore the theoretical and practical implications of using bootstrap test inversion to construct confidence intervals. In the presence of nuisance parameters, we show that the coverage error of such intervals is O ( n ^−1/2) which may be reduced to O ( n ⁻¹) if a Studentized statistic is used. We present three simulation studies and compare the performance of test inversion methods with established methods on the problem of estimating a confidence interval for the dose–response parameter in models of the Japanese atomic bomb survivors data.     

生活转折与创作转型——试论皮日休创作差异形成的原因

皮日休前后期作品在内容、体裁、风格乃至成就等方面都存在着明显差异,其创作表现为一个转型的过程.这个过程与创作者的人生经历尤其是生活转折密切关联.皮日体生活转折带来政治热情的消长以及性格气质的变化,创作主体心态与此遥相呼应,互为表里.两者的互动关系,正是前后期创作差异形成的关键所在.     

质速关系的恒力作功推导法

通过分析惯性系中的质点在恒力作用下作直线运动的事例 ,导出了质速关系     

Alternative Time Scales and Failure Time Models

In many reliability applications, there may not be a unique plausible scale in which to measure time to failure or assess performance. This is especially the case when several measures of usage are available on each unit. For example, the age, the total number of flight hours, and the number of landings are usage measures that are often considered important in aircraft reliability. Similarly, in medical or biological applications of survival analysis there are often alternative scales (e.g., Oakes, 1995). This paper considers the definition of a "good" time scale, along with methods of determining a time scale.     

企业转型与“先者生存”

企业转型是企业可持续发展的必经之路。特别对处于产业内追随地位的企业,转型是他们在未来的发展中占据有利位置的机会。当然,要实现这一点,时机相当重要。由于“先者生存”规律的存在,成功的转型必须要抓住机会先人一步,因为这样可以保证更多的收益和更高的存活率。     

儒家伦理在高科技时代的局限性及创造性转化

人类进入高科技时代后仍然面临一系列挑战,应对这些挑战是我们时代的重大课题。儒家伦理作为中国宝贵的传统文化资源虽然存在诸多局限,但其优秀成份仍然具有巨大的生命力,对今天高科技的良好发展和解决高科技带来的许多问题仍然起到巨大的规范、导向和推动作用。我们应克服儒家伦理在高科技时代的局限性并促进儒家伦理的创造性转化。     

大学新生英语学习转型期教学策略探索

]大学新生的英语学习面临着巨大的变化。本文通过高中英语和大学英语学习进行比较,揭示了大学新生英语学习的普遍问题,探讨了有助于大学新生快速有效地适应英语学习转型期的教学策略。     

中西之间:轴心时代文化转型的比较--以《周易》为透视文本

中国文化形态在轴心期发生了第一次大转型由神学文化形态转变为世俗文化形态.这次转型确立了作为人文主义精华的心学传统,这是今天现代化的宝贵精神资源;但同时也逐渐失落了作为"第一实体"的个体精神,这是与现代性相悖逆的.这次转型经过三个阶段(西周、春秋、战国),而<周易>文本正是其经典表征<易经>观念是其发端,<左传>筮例是其发展,<易传>思想是其完成.唯其如此,<周易>后来成为中国群经之首、百行之源.     

A Baseline-free Procedure for Transformation Models Under Interval Censorship

An important property of Cox regression model is that the estimation of regression parameters using the partial likelihood procedure does not depend on its baseline survival function. We call such a procedure baseline-free. Using marginal likelihood, we show that an baseline-free procedure can be derived for a class of general transformation models under interval censoring framework. The baseline-free procedure results a simplified and stable computation algorithm for some complicated and important semiparametric models, such as frailty models and heteroscedastic hazard/rank regression models, where the estimation procedures so far available involve estimation of the infinite dimensional baseline function. A detailed computational algorithm using Markov Chain Monte Carlo stochastic approximation is presented. The proposed procedure is demonstrated through extensive simulation studies, showing the validity of asymptotic consistency and normality. We also illustrate the procedure with a real data set from a study of breast cancer. A heuristic argument showing that the score function is a mean zero martingale is provided.     

"五四"时期青年毛泽东社会改造思想的转变

"五四"时期青年毛泽东社会改造思想本身是错综复杂的,但细细看来,它主要是从社会改造的出发点、社会改造的目的、社会改造的主体力量、社会改造的方法、社会改造的指导思想这五个方面形成、演进和转变的.理清这几个转变,对于准确理解毛泽东的社会改造思想和毛泽东思想的精髓具有关键性意义.