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排序方式: 共有522条查询结果,搜索用时 31 毫秒
81.
In this article, we present a principal component Liu-type estimator (LTE) by combining the principal component regression (PCR) and LTE to deal with the multicollinearity problem. The superiority of the new estimator over the PCR estimator, the ordinary least squares estimator (OLSE) and the LTE are studied under the mean squared error matrix. The selection of the tuning parameter in the proposed estimator is also discussed. Finally, a numerical example is given to explain our theoretical results. 相似文献
82.
Liang Hong 《The American statistician》2015,69(1):8-10
We revisit the addition law for expectations and present a sibling law: the absolute law for expectations. We show that these two laws and their corresponding laws for probabilities can be reconciled under a single framework. As an application, we use the absolute law for expectations to calculate the mean absolute deviation. Finally, we remark on a hidden point in a related article previously published on these pages; this will help readers to avoid a potential pitfall. 相似文献
83.
84.
In this paper, we study the estimation of the vitality function(v(x)=E(X|X>x) and mean residual life function(e(x)=E(X-x|X>x) from a sample ofX using the empirical estimator and kernel estimator. Under suitable conditions of regularity, the asymptotic normality of
the kernel estimator is obtained.
Partially supported by Consejeria de Cultura y Ed. (C.A.R.M.), under Grant PIB 95/90. 相似文献
85.
“和为贵”、“中庸之道”与“武士道”精神——关于日本政治文化的思考 总被引:3,自引:0,他引:3
赵宝煦 《北京大学学报(哲学社会科学版)》1999,(4)
“和为贵”与“中庸之道”,是中国传统文化中的重要思想原则。传入日本后,曾对其社会发展,产生很大积极作用。但同时,当日本对外侵略扩张时,又能与其“军国主义”思想并行不悖。为什么呢?这是与日本本土政治文化,诸如“内外有别”的共同体意识、“武士道”精神,以及“万世一系”的天皇制度等相结合的结果 相似文献
86.
传统尾部相关系数用于刻画变量之间的极值相关性,但这种相关系数存在对相关性信息刻画不完全的问题。为能够捕获更多的非极值相关性信息,本文提出均值尾部相关系数的概念,研究了均值尾部系数同Copula理论之间的关系,并以t Copula为例分析了四种均值尾部相关系数的变化特征。通过将均值尾部相关系数和传统尾部相关系数分别应用于沪深股市的相关性研究,从实证角度验证了这种相关系数的实用价值。 相似文献
87.
Suppose a finite population of several vertices, each connected to single or multiple edges. This constitutes a structure of graphical population of vertices and edges. As a special case, the graphical population like a binary tree having only two child vertices associated to parent vertex is taken into consideration. The entire binary tree is divided into two sub-graphs such as a group of left-nodes and a group of right-nodes. This paper takes into account a mixture of graph structured and population sampling theory together and presents a methodology for mean-edge-length estimation of left sub-graph using right edge sub-graph as an auxiliary source of information. A node-sampling procedure is developed for this purpose and a class of estimators is proposed containing several good estimators. Mathematical conditions for minimum bias and optimum mean squared error of the class are derived and theoretical results are numerically supported with a test of 99% confidence intervals. It is shown that suggested class has a sub-class of optimum estimators, and sample-based estimates are closer to the true value of the population parameter. 相似文献
88.
This article addresses the problem of estimating the population mean in stratified random sampling using the information of an auxiliary variable. A class of estimators for population mean is defined with its properties under large sample approximation. In particular, various classes of estimators are identified as particular member of the suggested class. It has been shown that the proposed class of estimators is better than usual unbiased estimator, usual combined ratio estimator, usual product estimator, usual regression estimator and Koyuncu and Kadilar (2009) class of estimators. The results have been illustrated through an empirical study. 相似文献
89.
Indrani Basak 《统计学通讯:理论与方法》2014,43(10-12):2322-2341
The problem of predicting times to failure of units from the Exponential Distribution which are censored under a simple step-stress model is considered in this article. We discuss two types of censoring—regular and progressive Type I—and two kinds of predictors—the maximum likelihood predictors (MLP) and the conditional median predictors (CMP) for each type of censoring. Numerical examples are used to illustrate the prediction methods. Using simulation studies, mean squared prediction error (MSPE) and prediction intervals are generated for these examples. MLP and the CMP are then compared with respect to MSPE and the prediction interval. 相似文献
90.
《The American statistician》2012,66(4):408-410
AbstractFeng et al. revealed that the usual mean value theorem (MVT) should not be applied directly to a vector-valued function (e.g., the score function or a general estimating function under a multiparametric model). This note shows that the application of the Cramer–Wold’s device to a corrected version of the MVT is sufficient to obtain standard asymptotics for the estimators attained from vector-valued estimating functions. 相似文献