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51.
We investigate the properties of several statistical tests for comparing treatment groups with respect to multivariate survival data, based on the marginal analysis approach introduced by Wei, Lin and Weissfeld [Regression Analysis of multivariate incomplete failure time data by modelling marginal distributians, JASA vol. 84 pp. 1065–1073]. We consider two types of directional tests, based on a constrained maximization and on linear combinations of the unconstrained maximizer of the working likelihood function, and the omnibus test arising from the same working likelihood. The directional tests are members of a larger class of tests, from which an asymptotically optimal test can be found. We compare the asymptotic powers of the tests under general contiguous alternatives for a variety of settings, and also consider the choice of the number of survival times to include in the multivariate outcome. We illustrate the results with simulations and with the results from a clinical trial examining recurring opportunistic infections in persons with HIV. 相似文献
52.
翻译是一种跨文化交际,成功的翻译能将原语文化汇精传神地介绍到译文中.通过赏析林语堂先生所译<浮生六记>中的一些典故,肯定了林语堂先生不拘一格运用的多种翻译手法使译文达到了"传神"的效果. 相似文献
53.
马菁 《江苏教育学院学报》2001,17(5):48-51
邓小平德育理论是具有中国社会主义特色的德育理论 ,它以马列主义哲学观作为指导思想 ,以“解放思想、实事求是”作为逻辑起点 ,以面向现代化、面向世界、面向未来作为价值取向。其操作过程具有战略、时代特征和中国初级阶段社会主义特色。为我国社会主义德育理论和实践的研究提供了全新的视角 相似文献
54.
陈会丽 《东北师大学报(哲学社会科学版)》2012,(1):150-153
魏晋时期是中国历史上的一个"尚美时代"。这一时期政治动荡、战争频繁、仕途艰险、生死难料,黑暗动乱年间的文人名士深切感受到了前途的渺茫,理想的破灭,从而放任性情,追求眼前享受,对各种美产生了狂热追求。玄学与佛学的传入,使这一时期的审美标准趋向多元化,注重从美的角度对人的个性、情感和才能加以品评。西晋文人潘岳无论其俊秀姿容,还是其性情与文采,均符合当时审美标准。另外,潘岳自身善良重情,对母至孝、对妻专情,亲情感人、友情真挚,做官清政为民,其勤政爱民的事迹至今仍为后人传颂。中国历史上才貌双全的俊男虽然众多,像潘岳这样能够生活在尚美时代,能够符合审美标准,能够如此至情至性的俊男却屈指可数,因此,无论时代审美观如何变化,他都将是中国的美男符号,是中国理想美男子的标准。 相似文献
55.
Edwin Choi & Peter Hall 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2000,62(2):461-477
Given a linear time series, e.g. an autoregression of infinite order, we may construct a finite order approximation and use that as the basis for confidence regions. The sieve or autoregressive bootstrap, as this method is often called, is generally seen as a competitor with the better-understood block bootstrap approach. However, in the present paper we argue that, for linear time series, the sieve bootstrap has significantly better performance than blocking methods and offers a wider range of opportunities. In particular, since it does not corrupt second-order properties then it may be used in a double-bootstrap form, with the second bootstrap application being employed to calibrate a basic percentile method confidence interval. This approach confers second-order accuracy without the need to estimate variance. That offers substantial benefits, since variances of statistics based on time series can be difficult to estimate reliably, and—partly because of the relatively small amount of information contained in a dependent process—are notorious for causing problems when used to Studentize. Other advantages of the sieve bootstrap include considerably greater robustness against variations in the choice of the tuning parameter, here equal to the autoregressive order, and the fact that, in contradistinction to the case of the block bootstrap, the percentile t version of the sieve bootstrap may be based on the 'raw' estimator of standard error. In the process of establishing these properties we show that the sieve bootstrap is second order correct. 相似文献
56.
论孔子的仁礼合一说 总被引:2,自引:0,他引:2
颜炳罡 《山东大学学报(哲学社会科学版)》2001,(2):52-59
仁与礼是孔子学说的两个基本范畴,仁礼关系是孔子学说的基本关系.在传统礼乐文化中发现仁,复引仁入礼,以礼释仁,赋予礼乐文化以真实意义与内在价值是孔子对中国文化的巨大贡献.孔子在中国文化史上创建了以仁为本源,以礼为表征,仁礼合一的思想系统.在这一思想系统中,礼是孔子对传统的继承,仁是孔子的创辟;仁是内在原则,礼是外在规范;仁是绝对的,礼是相对的;仁是常道,礼是变道.从纵向上讲,孔子的仁礼合一是继承与创新的合一;从横向上说,仁礼合一是内在原则与外在表现形式的合一.宋明儒者视礼为理,乾嘉学者以礼代理,都使礼由相对变为绝对,从而使礼由陶冶人性情的缘饰品变而为束缚人性正常发展的桎梏.据仁以成礼,非设礼以限仁,是孔子开出的儒学发展的正途. 相似文献
57.
Necessary and sufficient conditions for a linear estimator to dominate another linear estimator of a location parameter under the Pitman's criterion of comparison are discussed. Consequently it is demonstrated that a linear biased estimator can not dominate a linear unbiased estimator under Pitman's criterion and that the sample mean is the Closest Linear Unbiased Estimator (CLUE). It is also shown that the ridge regression estimator with a known biasing constant can not dominate the ordinary least squares estimator. If an estimator δdominates an estimator δin the average loss sense then sufficient conditions are obtained under which δis also preferred over δunder Pitman's criterion. Further we obtain sufficient conditions under which preference under the Pitman's criterion will lead to preference under the mean squared error sense. 相似文献
58.
J. Denis Sargan 《Econometric Reviews》2001,20(2):171-186
This paper examines the choice of critical values for testing both non-sequential and nested sequential sets of constraints in the standard linear regression model. Modest increases in (e.g.) t-ratio critical values relative to their one-off values are often sufficient to maintain proper size. A Bayesian decision-theoretic approach, highlighted by the Schwarz (1978) criterion, provides a framework for deriving consistency and asymptotic local power properties of both forms of testing (data mining) algorithms. 相似文献
59.
研究了AlN基片上重掺杂硼的多晶硅膜电阻率温度特性。实验发现,膜电阻率随温度变化呈现出从NTC过渡到PTC的U型特性,转折温度TM的位置依赖工艺条件的变化。理论分析表明:晶界势垒使膜电阻率在温度变化上存在一个极小值,极小值对应的转折温度正比于晶界势垒。 相似文献
60.
丛小兵 《江苏教育学院学报》2008,(4):82-84
顺应新课程标准的要求,数学思维能力的培养必须在遵循概念、判断、推理等一般规律的基础上,着力改进数学教学评价方式,努力将数学课堂还原为学堂,将数学教学延伸到课外、校外,引领学生在生动的数学学习中生成数学思维能力. 相似文献