Inference on a new lifetime distribution for a parallel

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Inference on a new lifetime distribution for a parallel

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Inference on a new lifetime distribution for a parallel-series system under
progressively type-II censored samples
Alaa H. Abdel-Hamid1, Atef F. Hashem1, Co¸skun Ku¸s2
1 Department of Mathematics and Computer Science, University of Beni-Suef, Beni-Suef, Egypt (e-mail: hamid−[email protected], dr−[email protected])
2 Department of Statistics, University of Selcuk, Selcuk, Turkey (e-mail: [email protected])
Abstract. In this paper we introduce a new lifetime distribution with increasing, decreasing or upside-down bathtub shaped hazard rates, called doubly Poisson exponential distribution. One of the motivations of the new distribution is that it may represent the lifetime of units connected in a parallel-series system. Several properties of the new distribution are discussed. Based on progressive type-II censoring, six estimation methods for the involved parameters are considered. The methods are maximum likelihood, moments, least squares, weighted least squares and Bayes (using linear-exponential and general entropy loss functions) estimations. Bayes estimates for the parameters are obtained using Markov chain Monte Carlo algorithm. The performance of these methods is compared through an extensive numerical simulation, based on mean of mean squared errors and mean of relative absolute biases. Two real data sets are used to compare the new distribution with other five distributions. The comparison shows that the former distribution is better to fit the data than the other five distributions.
Keywords: parallel-series system, progressive type-II censoring, exponential distribution, maximum likelihood, moments, least squares, weighted least squares and Bayes estimations, simulation.

Bayesian estimation on the exponentiated Pareto distribution under type II censoring
Hanaa Abu-Zinadah
Department of Statistics, Faculty of Science - AL Faisaliah Campus, King Abdulaziz University, Jeddah, Saudi Arabia (e-mail: [email protected])
Abstract. In this paper, Bayes estimates of the two shape parameters, reliability and failure rate functions of the exponentiated Pareto lifetime model are derived from complete and type II censored samples. When the Bayesian approach is concerned, conjugate priors for either the one or the two shape parameters cases are considered. An approximation form due to Lindley (1980) is used for obtaining the Bayes estimates under the squared error loss and LINEX loss functions. The root-mean square errors of the estimates are computed. Comparisons are made between the Bayes estimators.
Keywords: Bayes estimators, exponentiated Pareto distribution, LINEX loss function, squared error loss function.
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Pointwise estimation of bivariate Pickands dependence function: A Bernstein copula approach
Alireza Ahmadabadi, Burcu Hudaverdi Ucer
Department of Statistics, Dokuz Eylul University, Izmir, Turkiye (e-mail: [email protected], [email protected])
Abstract. Modeling dependence structures of joint extreme events has been interest of various applicational areas, such as, environmental science, insurance, finance, etc. Pickands dependence function that characterizes the extreme-value copula is widely used to model these extreme events. In this study, Bernstein copula approximation is used to estimate Pickands dependence function. Pointwise estimation procedure with a visual tool is proposed for investigating the extreme-value dependence structure. The performance of the estimator is presented with a simulation study. Test results mainly show that the estimator has a good performance in detecting the tail behavior.
Keywords: extreme-value, Bernstein copula, Pickands dependence function.
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Joint signatures
Narayanaswamy Balakrishnan
Department of Mathematics and Statistics, McMaster University, Canada (e-mail: [email protected])
Abstract. In this talk, I will introduce the notion of joint signatures of two systems and present some of their properties including mixture representations for joint distributions of lifetimes of the two systems. I will then use this representation to develop some statistical inferential methods for characteristics of both systems and components based on system lifetime data. I will present some examples to illustrate the results developed. Finally, I will conclude the talk by mentioning some further issues that are worth of further study.

Asymptotic behavior of the joint record values, with applications
H. M. Barakat1, M. A. Abd Elgawad2
1 Department of Mathematics, University of Zagazig, Zagazig, Egypt (e-mail: [email protected])
2 Department of Mathematics and Statistics, University of Central China Normal University, Wuhan 430079, China (e-mail: mohamed−[email protected])
Abstract. The class of limit distribution functions of the joint upper record values, as well as the joint of lower record values, is fully characterized. Sufficient conditions for the weak convergence are obtained. As an application of this result, the sufficient conditions for the weak convergence of the record quasi-range, record quasi-midrange, record extremal quasi-quotient and record extremal quasi-product are obtained. Moreover, the classes of the non-degenerate limit distribution functions of these statistics are derived.
Keywords: weak convergence, record values, joint record values, record functions.
1. Barakat H.M., Abd Elgawad M.A. Asymptotic behavior of the joint record values, with applications. (submitted)

Limit distributions of generalized order statistics in a stationary Gaussian sequence
H. M. Barakat, E. M. Nigm, E. O. Abo Zaid
Department of Mathematics, University of Zagazig, Zagazig, Egypt (e-mail: [email protected], s−[email protected], [email protected])
Abstract. In this paper we study the limit distributions of extreme, intermediate and central m-generalized order statistics (gos), as well as m-dual generalized order statistics (dgos), of a stationary Gaussian sequence under equi-correlated set up. Moreover, the result of extremes is extended to a wide subclass of gos, as well as dgos, (which contains the most important models of ordered random variables), when the parameters γ1,n, γ2,n, ..., γn,n are assumed to be pairwise different.
Keywords: Gaussian sequences, generalized order statistics, dual generalized order statistics.
1. Barakat H.M., Nigm E.M., Abo Zaid E.O. Asymptotic behavior of the joint record values, with applications. (submitted)

The estimations under power normalization for the tail index, with comparison
H. M. Barakat1, E. M. Nigm1, O. M. Khaled2, H. A. Alaswed3
1 Department of Mathematics, University of Zagazig, Zagazig, Egypt (e-mail: [email protected], s−[email protected])
2 Department of Mathematics, University of Port-Said, Port-Said, Egypt (e-mail: [email protected])
3 Department of Statistics, University of Sebha, Libya (e-mail: [email protected])
Abstract. The objective of this research is to suggest two classes of moment and moment ratio estimators under power normalization for the tail index. Moreover, for quantitative comparison of the suggested estimators and other estimators, we use a mean square error criterion. The problem of weighting between the linear and power models to describe the given extreme data is challenging. For this purpose, we suggest the coefficient variation criterion. A simulation study is conducted, to assess and compare the accuracy of the suggested estimators and other estimators, as well as the suggested statistical criterions. The suggested estimators and other estimators, as well as the suggested criterions are used to analyze a real data sets. All computations in this work are performed by R-package.
Keywords: power normalization, generalized Pareto distributions, Hill estimators, moment estimator, moment ratio estimator.
1. Barakat H.M., Nigm E.M., Khaled O.M., Alaswedz H.A. The estimations under power normalization for the tail index, with comparison. (submitted)

On some new models of multivariate record values
I˙smihan Bayramoglu
Department of Mathematics, Izmir University of Economics, Turkey (e-mail: [email protected])
Abstract. The theory of record values in multivariate sequences of random variables is considered. One of the considered models is based on coordinatewise ordering of multivariate observations. The distributional properties of record values in a new scheme of multivariate records is presented. Some examples with well known bivariate distributions as underlying distributions of original sample are given and graphical illustrations are provided. In the second record model, we consider the N-ordering scheme for random vectors and define new records according to this ordering. The distributional theory of bivariate records and record times is given. Examples and graphical illustrations are provided. Challenging unsolved problems on record theory of multivariate random sequences are discussed.
Keywords: order statistics, record values, multivariate orderings.
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Sons, New York. 3. Arnold B.C., Castillo E., Sarabia J.S. (2009a). Multivariate order statistics via
multivariate concomitants. Journal of Multivariate Analysis, 100, 946–951. 4. Arnold B.C., Castillo E., Sarabia J.S. (2009b). On multivariate order statistics.
Application to ranked set sampling. Computational Statistics and Data Analysis, 53, 4555–4569. 5. Bairamov I. (2006). Progressive type-II censored order statistics for multivariate observations. Journal of Multivariate Analysis, 97, 797–809. 6. Bairamov I.G., Gebizlioglu O.L. (1998). On the ordering of random vectors in a norm sense. Journal of Applied Statistical Sciences, 6, 77–86. 7. Barnet V. (1976). The ordering of multivariate data. Journal of Royal Statistical Society, A, 139, 318–343.

The role of record values in reliability⋆
F´elix Belzunce
Department of Statistics and Operations Research, University of Murcia, Murcia, Spain (e-mail: [email protected])
Abstract. The notion of record values was introduced by Chandler (1952). Since then, a great number of results have been provided for record values. The record values have other interpretations mainly in reliability, such as failures times of minimal repair policies and the relevation transform. Under this interpretations two main areas of research have been developed along the years. One is to study aging properties of record values, such as IFR, NBU or ILR (see Pellerey, Shaked and Zinn, 2000) and and the other one is the comparison of record values arising from different parent populations (see Belzunce, Lillo, Ruiz and Shaked, 2001). The purpose of this talk is to provide, first, a historical review of the different interpretations of record values in reliability and a review of some of the main results about aging properties and comparison of record values. Next I will present some new questions about record values, that can be addressed from the point of view of reliability. Mainly I will discuss some new results about the comparison of a minimal repair process with a renewal process and some new results about the role of relevation in allocation of redundant components. This talk is also intended to be a tribute to Moshe Shaked, who made great contributions on the topics of this talk.
Keywords: record values, minimal repair process, relevation transform.
1. Belzunce F., Lillo R., Ruiz J.M., Shaked M. (2001). Stochastic comparisons of nonhomogeneous processes. Probability in the Engineering and Informational Sciences, 15, 199–224.
2. Chandler K.N. (1952). The distribution and frequency of record values. Journal of the Royal Statistical Society, Series B, 14, 220–228.
3. Pellerey F., Shaked M., Zinn J. (2000). Nonhomogeneous Poisson processes and logconcavity. Probability in the Engineering and Informational Sciences, 14, 353– 373.
⋆ This work has been supported by the Ministerio de Econom´ıa y Competitividad under grant MTM2012-34023-FEDER
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