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51.
This paper considers a class of densities formed by taking the product of nonnegative polynomials and normal densities. These densities provide a rich class of distributions that can be used in modelling when faced with non-normal characteristics such as skewness and multimodality. In this paper we address inferential and computational issues arising in the practical implementation of this parametric family in the context of the linear model. Exact results are recorded for the conditional analysis of location-scale models and an importance sampling algorithm is developed for the implementation of a conditional analysis for the general linear model when using polynomial-normal distributions for the error. 相似文献
52.
The joint effect of the deletion of the ith and jih cases is given by Gray and Ling (1984), they discussed the influence measures for influential subsets in linear regression analysis. The present paper is concerned with multiple sets of deletion measures in the linear regression model. In particular we are interested in the effects of the jointly and conditional influence analysis for the detection of two influential subsets. 相似文献
53.
条件逻辑是以充分条件、必要条件、充分必要条件以及它们之间相互关系为研究对象的逻辑理论。运用现代逻辑的手段,深入研究各种条件联系及其它们相互之间的逻辑关系,这对提高我们的认识能力、有效从事实践具有指导意义。在给出的定义的基础上.我们可以证明有关充分条件、必要条件、充分必要条件的大量定理,条件逻辑就是由定义和定理所构成的形式系统。 相似文献
54.
WENCESLAO GONZÁLEZ‐MANTEIGA JUAN CARLOS PARDO‐FERNÁNDEZ INGRID VAN KEILEGOM 《Scandinavian Journal of Statistics》2011,38(1):169-184
Abstract. The receiver operating characteristic (ROC) curve is a tool of extensive use to analyse the discrimination capability of a diagnostic variable in medical studies. In certain situations, the presence of a covariate related to the diagnostic variable can increase the discriminating power of the ROC curve. In this article, we model the effect of the covariate over the diagnostic variable by means of non‐parametric location‐scale regression models. We propose a new non‐parametric estimator of the conditional ROC curve and study its asymptotic properties. We also present some simulations and an illustration to a data set concerning diagnosis of diabetes. 相似文献
55.
56.
李利君 《河南科技大学学报(社会科学版)》2009,27(6):91-94
附条件逮捕发端于司法实践,对协调办案需要和人权保障意义重大。但各地运行状况并不统一,学界也存在着一定的理论争议。对此可以从文本认同、理论认同和感情认同三个角度加以探讨,既指出理论质疑,也阐明其存在的合理性和改善的必要性。 相似文献
57.
Bruce Levin 《统计学通讯:理论与方法》2013,42(11):1299-1327
We describe a method of computing the cumulative distribution function of the maximum and minimum cell frequencies in sampling distributions commonly encountered in the analysis of categorical data.The procedure is efficient for exact or approximate calculation in both homogeneous and non-homogeneous cases, is non-recursive, and does not require Dirichlet integrals.Some related statistical problems are also discussed. 相似文献
58.
Limited information bayesian analysis of a structural coefficient in a simultaneous equations system
Hiroki Tsurumi 《统计学通讯:理论与方法》2013,42(5):1103-1120
An analytical expression is obtained for the marginal posterior density for a structural coefficient in a simultaneous equations system based on a limited information Bayesian analysis. A con- ditional posterior density is obtained given reduced form para- meters. This conditional posterior density is in univariate student t form. Numerical examples suggest that the conditional density hasa tighter distribution around the posterior mean than the unconditional density when the correlation between the endo- genous variables and the structural error term is high. 相似文献
59.
Marilena Furno 《Statistical Methods and Applications》1996,5(3):369-385
Summary The paper shows that the informaton matrix test presented by White (1982) decomposes into the sum of quadratic forms in the
case of a linear model with ARMA errors. By extending previous results, which analysed the information matrix test in the
presence of serial correlation, the test allows detection of additional sources of misspecification. 相似文献
60.
在粗糙表面高度起伏服从高斯统计和表面服从圆型相关的情况下,分析了由弱散射体产生的远场高斯激光散斑相位差的条件统计分布与表面粗糙度的关系. 相似文献