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111.
This paper deals with models and methods for count data derived from observations on pairing phenomena. Pairs formed from “similar” members are excluded. Various models are considered and analyzed. Particular emphasis is on developing methods for testing whether particular pairs are prone to occur more or less often than expected by chance. 相似文献
112.
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
113.
Alexandras A. Arabatzis Timothy G. Gregoire Marion R. Reynolds Jr 《统计学通讯:理论与方法》2013,42(12):4359-4373
The effect of rejecting a two-sided preliminary test of significance for the mean of a normal distribution upon subsequent interval estimation of the mean is examined. For the case where the variance is known, conditional confidence intervals may be shorter than unconditional intervals, in contrast to the one-sided preliminary test case examined by Meeks and D’Agostino (1983, The American Statistician, 7, 134-136) . For the case where the variance is unknown and must be estimated by the sample variance, it is shown that customary intervals do not offer uniformly greater or lesser coverage than the nominal level. 相似文献
114.
YANG Li 《中北大学学报(社会科学版)》2008,(Z1)
在概率统计教学的基础上,对参数假设检验教学中出现的学生难于理解的几个问题做了系统的总结,主要包括决策的依据,拒绝域的选择以及决策可靠性的判断,其中对做出"接受零假设"决策的可靠性给出了解释。 相似文献
115.
赵熹妮 《长春理工大学学报(高教版)》2007,(4)
伴随全球经济的发展,国内外市场对优秀高职院校毕业生需求的不断增加,我国的高职教学受到越来越多的关注。作为高职教育重要组成部分之一的高职英语自然也成为关注的焦点。通过论述多媒体、网络技术在高职英语教学中发挥的作用、特点和带来的挑战且结合实际的教学时间证明:运用多媒体、网络技术进行教学为高职英语教学带来了新变化,收到良好效果,符合信息时代高职英语教学的需要。 相似文献
116.
117.
Sibel Balci 《Journal of applied statistics》2015,42(11):2293-2306
In one-way ANOVA, most of the pairwise multiple comparison procedures depend on normality assumption of errors. In practice, errors have non-normal distributions so frequently. Therefore, it is very important to develop robust estimators of location and the associated variance under non-normality. In this paper, we consider the estimation of one-way ANOVA model parameters to make pairwise multiple comparisons under short-tailed symmetric (STS) distribution. The classical least squares method is neither efficient nor robust and maximum likelihood estimation technique is problematic in this situation. Modified maximum likelihood (MML) estimation technique gives the opportunity to estimate model parameters in closed forms under non-normal distributions. Hence, the use of MML estimators in the test statistic is proposed for pairwise multiple comparisons under STS distribution. The efficiency and power comparisons of the test statistic based on sample mean, trimmed mean, wave and MML estimators are given and the robustness of the test obtained using these estimators under plausible alternatives and inlier model are examined. It is demonstrated that the test statistic based on MML estimators is efficient and robust and the corresponding test is more powerful and having smallest Type I error. 相似文献
118.
This paper studies the asymptotic behaviour of the false discovery and non‐discovery proportions of the dynamic adaptive procedure under some dependence structure. A Bahadur‐type representation of the cut point in simultaneously performing a large scale of tests is presented. The asymptotic bias decompositions of the false discovery and non‐discovery proportions are given under some dependence structure. In addition to existing literatures, we find that the randomness due to the dynamic selection of the tuning parameter in estimating the true null rate serves as a source of the approximation error in the Bahadur representation and enters into the asymptotic bias term of the false discovery proportion and those of the false non‐discovery proportion. The theory explains to some extent why some seemingly attractive dynamic adaptive procedures do not outperform the competing fixed adaptive procedures substantially in some situations. Simulations justify our theory and findings. 相似文献
119.
许惠英 《浙江树人大学学报》2004,4(4):95-96
分析了高校化工、生物技术、环境保护及食品工程等相关专业的专业基础课程《无机化学》实验教学改革的必要性,探索并实施了一系列有效的改革方案,取得了良好的实验教学效果. 相似文献
120.