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861.
《Journal of Statistical Computation and Simulation》2012,82(10):1281-1296
For longitudinal time series data, linear mixed models that contain both random effects across individuals and first-order autoregressive errors within individuals may be appropriate. Some statistical diagnostics based on the models under a proposed elliptical error structure are developed in this work. It is well known that the class of elliptical distributions offers a more flexible framework for modelling since it contains both light- and heavy-tailed distributions. Iterative procedures for the maximum-likelihood estimates of the model parameters are presented. Score tests for the presence of autocorrelation and the homogeneity of autocorrelation coefficients among individuals are constructed. The properties of test statistics are investigated through Monte Carlo simulations. The local influence method for the models is also given. The analysed results of a real data set illustrate the values of the models and diagnostic statistics. 相似文献
862.
Manoochehr Babanezhad Stijn Vansteelandt Els Goetghebeur 《Journal of statistical planning and inference》2010
Over the past decades, various principles for causal effect estimation have been proposed, all differing in terms of how they adjust for measured confounders: either via traditional regression adjustment, by adjusting for the expected exposure given those confounders (e.g., the propensity score), or by inversely weighting each subject's data by the likelihood of the observed exposure, given those confounders. When the exposure is measured with error, this raises the question whether these different estimation strategies might be differently affected and whether one of them is to be preferred for that reason. In this article, we investigate this by comparing inverse probability of treatment weighted (IPTW) estimators and doubly robust estimators for the exposure effect in linear marginal structural mean models (MSM) with G-estimators, propensity score (PS) adjusted estimators and ordinary least squares (OLS) estimators for the exposure effect in linear regression models. We find analytically that these estimators are equally affected when exposure misclassification is independent of the confounders, but not otherwise. Simulation studies reveal similar results for time-varying exposures and when the model of interest includes a logistic link. 相似文献
863.
崔兆芳 《吉林工程技术师范学院学报》2010,26(4):50-52
通过对吉林省三种类型体育社团的典型代表进行访问调查,从五个方面探讨了吉林省体育社团发展的现状和存在的问题,并给出了解决对策。 相似文献
864.
Hans Arnfinn Karlsen Terje MyklebustDag Tjøstheim 《Journal of statistical planning and inference》2010
We derive an asymptotic theory of nonparametric estimation for a time series regression model Zt=f(Xt)+Wt, where {Xt} and {Zt} are observed nonstationary processes, and {Wt} is an unobserved stationary process. The class of nonstationary processes allowed for {Xt} is a subclass of the class of null recurrent Markov chains. This subclass contains the random walk, unit root processes and nonlinear processes. The process {Wt} is assumed to be linear and stationary. 相似文献
865.
仇怡 《沈阳工业大学学报(社会科学版)》2010,3(3):236-239
为考察改革开放以来我国技术进步对经济增长贡献份额的变化情况,选用1979—2003年的相关数据进行实证分析。研究表明,改革开放以来我国技术进步对经济增长的贡献率偏低,经济增长主要是靠资本投入和劳动投入(特别是资本投入)来拉动的。因此,今后应不断增强我国企业的技术吸收能力和自主创新能力,实现从粗放型增长方式到集约型增长方式的转变,增强技术进步对经济增长的促进作用。 相似文献
866.
K.R. Clarke 《统计学通讯:理论与方法》2013,42(15):1459-1478
Stereology typically concerns estimation of properties of a geometric structure from plane section information. This paperprovides a brief review of some statistical aspects of this rapidly developing field, with some reference to applications in the earth sciences. After an introductory discussion of the scope of stereology, section 2 briefly mentions results applicable when no assumptions can be made about the stochastic nature of the sampled matrix, statistical considerations then arising solelyfrom the ‘randomness’ of the plane section. The next two sections postulate embedded particles of specific shapes, the particular case of spheres being discussed in some detail. References are made to results for ‘thin slices’ and other prob-ing mechanisms. Randomly located convex particles, of otherwise arbitrary shape, are discussed in section 5 and the review concludes with a specific application of stereological ideas to some data on neolithic mining. 相似文献
867.
Peyton Cook 《统计学通讯:理论与方法》2013,42(5):1001-1018
The article describes an operational Bayesian approach to making inferences for the spectral density function for univariate autoregressive processes and for the AR operator of multivariate autoregressive processes. The derivation of the approach is described. Numerical examples, including the Wolfer Sunspot numbers, are used to demonstrate the practical usefulness of the approach. 相似文献
868.
魏晓斌 《湖南工程学院学报(社会科学版)》2010,20(3)
同隐喻一样,借代也是一种重要的思维方式和认知工具.然而,长期以来,借代研究仍然拘泥于修辞范畴,其功能得不到充分体现.本文从认知角度出发,在引入理想化认知模型(ICM)的基础上对借代的工作机制进行重新探讨和认识,同时对其在语篇连贯和衔接方面所发挥的重要作用也进行了初步研究. 相似文献
869.
Fred J. Connell 《The American statistician》2013,67(2)
Given a rational, finite probability vector, a Markov chain is constructed having the given vector as its stationary distribution. 相似文献
870.
Lattice paths are enumerated as walks on a lattice under the Delannoy criterion of vertical, horizontal and upward diagonal steps. Delannoy recursions are generalized for arbitrary weights in each of these directions, where the row elements of the Delannoy triangles correspond to lattice paths for all walks at a given length. 相似文献