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251.
《统计学通讯:理论与方法》2012,41(16-17):3094-3109
In this article, multivariate extensions of the combination-based test statistics for the comparison of several treatments in the multivariate Randomized Complete Block designs are introduced in case of categorical response variables. Several tests for the multivariate Randomized Complete Block designs, including MANOVA procedure, are compared with the method proposed via a Monte Carlo simulation study. The method has also been applied to a real case study in the field of sensorial testing studies. Results suggest that in each experimental situation where normality of the supposed underlying continuous model is hard to justify and especially when errors have heavy-tailed distributions, the proposed nonparametric procedure can be considered as a valid solution. 相似文献
252.
We propose in this article a novel dimension reduction method for varying coefficient models. The proposed method explores the rank reducible structure of those varying coefficients, hence, can do dimension reduction and semiparametric estimation, simultaneously. As a result, the new method not only improves estimation accuracy but also facilitates practical interpretation. To determine the structure dimension, a consistent BIC criterion is developed. Numerical experiments are also presented. 相似文献
253.
《Journal of Statistical Computation and Simulation》2012,82(3-4):161-173
A computational algorithm is given which calculates exact significance levels of a wide class of permutation tests in the one and two sample problems. This class includes the permutation test based on the means, locally most powerful permutation tests and linear rank tests. When a shift model is assumed confidence intervals can also be obtained. Approximate methods, based on asymptotic expansions, are also presented. 相似文献
254.
We derive Bayesian interval estimators for the differences in the true positive rates and false positive rates of two dichotomous diagnostic tests applied to the members of two distinct populations. The populations have varying disease prevalences with unverified negatives. We compare the performance of the Bayesian credible interval to the Wald interval using Monte Carlo simulation for a spectrum of different TPRs, FPRs, and sample sizes. For the case of a low TPR and low FPR, we found that a Bayesian credible interval with relatively noninformative priors performed well. We obtain similar interval comparison results for the cases of a high TPR and high FPR, a high TPR and low FPR, and of a high TPR and mixed FPR after incorporating mildly informative priors. 相似文献
255.
《Journal of Statistical Computation and Simulation》2012,82(6):1165-1186
In this paper, progressive-stress accelerated life tests are applied when the lifetime of a product under design stress follows the exponentiated distribution [G(x)]α. The baseline distribution, G(x), follows a general class of distributions which includes, among others, Weibull, compound Weibull, power function, Pareto, Gompertz, compound Gompertz, normal and logistic distributions. The scale parameter of G(x) satisfies the inverse power law and the cumulative exposure model holds for the effect of changing stress. A special case for an exponentiated exponential distribution has been discussed. Using type-II progressive hybrid censoring and MCMC algorithm, Bayes estimates of the unknown parameters based on symmetric and asymmetric loss functions are obtained and compared with the maximum likelihood estimates. Normal approximation and bootstrap confidence intervals for the unknown parameters are obtained and compared via a simulation study. 相似文献
256.
Yu Hsing 《Transition Studies Review》2007,14(2):274-282
The demand for real M1 in Slovakia is positively influenced by real output and the stock price and negatively associated with
the deposit rate, depreciation of the koruna, the euro interest rate, and the expected inflation rate. Considering the goods
and the money market simultaneously, these results suggest that a higher stock price may or may not cause real output to rise
and that a depreciation of the koruna or a higher euro interest rate would help raise Slovakia's real output. The coefficients
of the deposit rate and the stock price in real M2 demand are insignificant at the 10% level. The likelihood ratio test in
the extended Box–Cox model shows that the double-log form cannot be rejected at the 5% level while the linear form can be
rejected at the 5% level. The CUSUM and CUSUMSQ tests show that the money demand function was relatively stable.
相似文献
257.
Paul R. Rosenbaum 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2005,67(4):515-530
Summary. A new test is proposed comparing two multivariate distributions by using distances between observations. Unlike earlier tests using interpoint distances, the new test statistic has a known exact distribution and is exactly distribution free. The interpoint distances are used to construct an optimal non-bipartite matching, i.e. a matching of the observations into disjoint pairs to minimize the total distance within pairs. The cross-match statistic is the number of pairs containing one observation from the first distribution and one from the second. Distributions that are very different will exhibit few cross-matches. When comparing two discrete distributions with finite support, the test is consistent against all alternatives. The test is applied to a study of brain activation measured by functional magnetic resonance imaging during two linguistic tasks, comparing brains that are impaired by arteriovenous abnormalities with normal controls. A second exact distribution-free test is also discussed: it ranks the pairs and sums the ranks of the cross-matched pairs. 相似文献
258.
法国高校招考制度及其启示 总被引:2,自引:0,他引:2
郑若玲 《中国地质大学学报(社会科学版)》2008,8(3):56-60
中学毕业会考制度是法国学制中一种特有的考试制度,具有权威、合理、多样等鲜明特点。法国的高校招考实行"证书制",但各校由于层次高低不同,录取新生的标准和办法也各异。我国的高考改革可以从法国高校招考制度得出一些有益的启示与借鉴。 相似文献
259.
Chris J. Lloyd 《Australian & New Zealand Journal of Statistics》2008,50(4):329-345
In constructing exact tests from discrete data, one must deal with the possible dependence of the P‐value on nuisance parameter(s) ψ as well as the discreteness of the sample space. A classical but heavy‐handed approach is to maximize over ψ. We prove what has previously been understood informally, namely that maximization produces the unique and smallest possible P‐value subject to the ordering induced by the underlying test statistic and test validity. On the other hand, allowing for the worst case will be more attractive when the P‐value is less dependent on ψ. We investigate the extent to which estimating ψ under the null reduces this dependence. An approach somewhere between full maximization and estimation is partial maximization, with appropriate penalty, as introduced by Berger & Boos (1994, P values maximized over a confidence set for the nuisance parameter. J. Amer. Statist. Assoc. 89 , 1012–1016). It is argued that estimation followed by maximization is an attractive, but computationally more demanding, alternative to partial maximization. We illustrate the ideas on a range of low‐dimensional but important examples for which the alternative methods can be investigated completely numerically. 相似文献
260.
《Journal of Statistical Computation and Simulation》2012,82(1-2):47-62
Within a Monte Carlo study finite sample results are obtained for different generalized rank tests based on randomly censored life time data. It is pointed out that conditional tests should be applied in practice whenever drastic differences between the censoring distributions for the underlying groups do not appear. The tests are slight modifications of known permutation tests for censored data. 相似文献