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排序方式: 共有188条查询结果,搜索用时 31 毫秒
101.
This article considers a simple test for the correct specification of linear spatial autoregressive models, assuming that the choice of the weight matrix Wn is true. We derive the limiting distributions of the test under the null hypothesis of correct specification and a sequence of local alternatives. We show that the test is free of nuisance parameters asymptotically under the null and prove the consistency of our test. To improve the finite sample performance of our test, we also propose a residual-based wild bootstrap and justify its asymptotic validity. We conduct a small set of Monte Carlo simulations to investigate the finite sample properties of our tests. Finally, we apply the test to two empirical datasets: the vote cast and the economic growth rate. We reject the linear spatial autoregressive model in the vote cast example but fail to reject it in the economic growth rate example. Supplementary materials for this article are available online. 相似文献
102.
ABSTRACTIn response to growing concern about the reliability and reproducibility of published science, researchers have proposed adopting measures of “greater statistical stringency,” including suggestions to require larger sample sizes and to lower the highly criticized “p?<?0.05” significance threshold. While pros and cons are vigorously debated, there has been little to no modeling of how adopting these measures might affect what type of science is published. In this article, we develop a novel optimality model that, given current incentives to publish, predicts a researcher’s most rational use of resources in terms of the number of studies to undertake, the statistical power to devote to each study, and the desirable prestudy odds to pursue. We then develop a methodology that allows one to estimate the reliability of published research by considering a distribution of preferred research strategies. Using this approach, we investigate the merits of adopting measures of “greater statistical stringency” with the goal of informing the ongoing debate. 相似文献
103.
在经济计量建模过程中,异常值的影响评价与诊断问题越来越显得重要。本文旨在提供异常值对复共线性关系检验、序列相关性检验、异方差性检验、单位根检验等经济计量检验产生致命影响的典型案例,为经济计量学的教学与相关建模理论研究提供有说服力的数据资料。 相似文献
104.
Tests for the cointegrating rank of a vector autoregressive process are considered that allow for possible exogenous shifts in the mean of the data-generation process. The break points are assumed to be known a priori. It is proposed to estimate and remove the deterministic terms such as mean, linear-trend term, and a shift in a first step. Then systems cointegration tests are applied to the adjusted series. The resulting tests are shown to have known limiting null distributions that are free of nuisance parameters and do not depend on the break point. The tests are applied for analyzing the number of cointegrating relations in two German money-demand systems. 相似文献
105.
We provide three new results concerning quasi-maximum likelihood (QML) estimators in generalized autoregressive conditional heteroskedastic in mean (GARCH-M) models. We first show that, depending on the functional form that we impose in the mean equation, the properties of the model may change and the conditional variance parameter space may be restricted, in contrast to the theory of traditional GARCH processes. Second, we also present a new test for GARCH effects in the GARCH-M context which is simpler to implement than alternative procedures such as in Beg et al. (2001). We propose a new way of dealing with parameters that are not identified by creating composites of parameters that are identified. Third, the finite sample properties of QML estimators are explored in a restricted ARCH-M model and bias and variance approximations are found which show that the larger the volatility of the process the better the variance parameters are estimated. The invariance properties that Lumsdaine (1995) proved for the traditional GARCH are shown not to hold in the GARCH-M. For those researchers who choose not to rely on the first order asymptotic approximation of our proposed test statistic, we also show how our bias expressions can be used to bias correct the QML estimates with a view to improving the finite sample performance of the test. Finally, we show how our new proposed test works in practice in an empirical economic application. 相似文献
106.
107.
《Journal of Statistical Computation and Simulation》2012,82(2-4):239-247
Let X 1,…,X n be the lifetimes of n items put on testing at the same time. It is not possible to observe the actual lifetimes. However, it is possible to inspect the items at a finite number of time intervals. At each time of inspection, the number of failures can be recorded. Only these numbers of failures at times of inspections will be available to make decision on the distribution of the lifetimes. Decision can be made at the time of inspection. A “sequential” statistical test is developed to test the mean levels of the lifetimes when the probability distribution is assumed to be exponential. Some numerical results will be presented. The power and the expected time for the decision are compared with those for the idealized situation when each and every actual lifetime is recorded. They are also compared with those for the case when one and only one inspection is allowed to make the decision. 相似文献
108.
Fulvio De Santis Marco Perone Pacifico Valeria Sambucini 《Journal of the Royal Statistical Society. Series C, Applied statistics》2004,53(3):427-441
Summary. The identification of factors that increase the chances of a certain disease is one of the classical and central issues in epidemiology. In this context, a typical measure of the association between a disease and risk factor is the odds ratio. We deal with design problems that arise for Bayesian inference on the odds ratio in the analysis of case–control studies. We consider sample size determination and allocation criteria for both interval estimation and hypothesis testing. These criteria are then employed to determine the sample size and proportions of units to be assigned to cases and controls for planning a study on the association between the incidence of a non-Hodgkin's lymphoma and exposition to pesticides by eliciting prior information from a previous study. 相似文献
109.
现行高校体育课程体系存在着有些项目重复考试次数过多 ,考试重生理、轻心理等问题。应以“健康第一”为指导思想 ,以完成体育教学的两项基本任务为主要依据 ,改革现行考试体系 ,减缩运动素质项目 ,增加心理素质成份 ,取消课堂表现成绩。考试形式也应多样化 相似文献
110.
测试英语词汇的广度、深度和强度 总被引:1,自引:0,他引:1
自98年Laufer两次进行广度结合强度的三层面英语词汇知识研究后,Laufer et al于2004年两次进行了四层面词汇知识研究,首次提出并正在进行词汇广度结合强度的计算机机测的研究工作。在词汇研究领域原有的广度和深度上,又开辟了一条新的道路。文章试讨论80年代以来国内外就测试英语词汇的广度、深度和强度的主要研究,尝试探讨这些研究对我们英语词汇测试研究与词汇学习的启示。 相似文献