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排序方式: 共有268条查询结果,搜索用时 15 毫秒
21.
In this paper, we consider a generalisation of the backward simulation method of Duch et al. [New approaches to operational risk modeling. IBM J Res Develop. 2014;58:1–9] to build bivariate Poisson processes with flexible time correlation structures, and to simulate the arrival times of the processes. The proposed backward construction approach uses the Marshall–Olkin bivariate binomial distribution for the conditional law and some well-known families of bivariate copulas for the joint success probability in lieu of the typical conditional independence assumption. The resulting bivariate Poisson process can exhibit various time correlation structures which are commonly observed in real data. 相似文献
22.
23.
Mohsen Rezapour 《统计学通讯:理论与方法》2017,46(11):5595-5611
Progressively Type-II censored conditionally N-ordered statistics (PCCOS-N) arising from iid random vectors Xi = (X1i, X2i, …, Xip), i = 1, 2…, n, were investigated by Bairamov (2006), with respect to the magnitudes of N(Xi), i = 1, 2, …, n, where N( · ) is a p-variate measurable function defined on the support set of X1 satisfying certain regularity conditions and N(Xi) denotes the lifetime of the random vector Xi, i = 1, …, n. Under the PCCOS-N sampling scheme, n independent units are placed on a life-test and after the ith failure, Ri (i = 1, …, m) of the surviving units are removed at random from the remaining observations. In this article, we consider PCCOS-N arising from a vector with identical as well as non identical dependent components, jointly distributed according to a unified elliptically contoured copula (PCCOSDUECC-N). Results established here contain the previous results as particular cases. Illustrative examples and simulation studies show that PCCOSDUECC-N enables us to analyze the lifetime of several systems, including repairable systems and systems with standby components, more efficiently than PCCOS-N. 相似文献
24.
Yihao Deng 《统计学通讯:理论与方法》2017,46(20):10097-10102
Modeling binary familial data has been a challenging task due to the dependence among family members and the constraints imposed on the joint probability distribution of the binary responses. This paper investigates some useful familial dependence structures and proposes analyzing binary familial data using Gaussian copula model. Advantages of this approach are discussed as well as some computational details. An numerical example is also presented with an aim to show the capability of Gaussian copula model in more sophisticated data analysis. 相似文献
25.
作为指示代词,"是"最初指代的是时间,相当于"这时",后泛化为一个确指代词。正因为"是"的确指性,它在先秦时期有一系列的特殊用法。并最终发展成为系词。当用于判断句的主谓之间复指主语的时候,"是"逐步语法化为近乎强调确认的标记。当判断句中必须出现"是",并且"是"的出现不带有任何强调的意味的时候,它就发展成为系词。 相似文献
26.
Nina Meinel 《AStA Advances in Statistical Analysis》2009,93(2):159-174
For multivariate probit models, Spiess and Tutz suggest three alternative performance measures, which are all based on the
decomposition of the variation. The multivariate probit model can be seen as a special case of the discrete copula model.
This paper proposes some new measures based on the value of the likelihood function and the prediction-realization table.
In addition, it generalizes the measures from Spiess and Tutz for the discrete copula model. Results of a simulation study
designed to compare the different measures in various situations are presented. 相似文献
27.
Fully nonparametric tests for the independence between random vectors are studied in this paper. The test statistics are functionals of an empirical process defined as the difference between the joint empirical copula and the product of the empirical copulas associated to the vectors that are suspected to be independent. The validity of a weighted bootstrap procedure is established, which allows for a quick computation of p-values. A special attention is given to the asymptotic behavior of the tests under contiguous sequences of distributions. Finally, a characteristic of the copulas in the Archimedean class in terms of independence of vectors is exploited in order to propose a new goodness-of-fit procedure. 相似文献
28.
Fisher information contained in record values, inter-record times and their concomitants from a sample of fixed size is derived in general and explicit expressions are deduced for some specific known bivariate classes of distributions. A comparison between fixed sampling and inverse sampling schemes with equal number of records and concomitants is also carried out. We also consider parameter estimation based on bivariate records and a small simulation study is done. 相似文献
29.
Göran Kauermann Christian Schellhase David Ruppert 《Scandinavian Journal of Statistics》2013,40(4):685-705
The paper introduces a new method for flexible spline fitting for copula density estimation. Spline coefficients are penalized to achieve a smooth fit. To weaken the curse of dimensionality, instead of a full tensor spline basis, a reduced tensor product based on so called sparse grids (Notes Numer. Fluid Mech. Multidiscip. Des., 31, 1991, 241‐251) is used. To achieve uniform margins of the copula density, linear constraints are placed on the spline coefficients, and quadratic programming is used to fit the model. Simulations and practical examples accompany the presentation. 相似文献
30.
We introduce two extreme methods to pairwisely compare ordered lists of the same length, viz. the comonotonic and the countermonotonic
comparison method, and show that these methods are, respectively, related to the copula T
M
(the minimum operator) and the Ł ukasiewicz copula T
L
used to join marginal cumulative distribution functions into bivariate cumulative distribution functions. Given a collection
of ordered lists of the same length, we generate by means of T
M
and T
L
two probabilistic relations Q
M
and Q
L
and identify their type of transitivity. Finally, it is shown that any probabilistic relation with rational elements on a
3-dimensional space of alternatives which possesses one of these types of transitivity, can be generated by three ordered
lists and at least one of the two extreme comparison methods. 相似文献