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Inference for the unit-Gompertz model based on record values and inter-record times with an application. (English) Zbl 1461.62057
Summary: J. Mazucheli et al. [“Unit-Gompertz distribution with applications”, Statistica 79, No. 1, 25–43 (2019; doi:10.6092/issn.1973-2201/8497 )] introduced a new transformed model called the unit-Gompertz (UG) distribution which exhibits right-skewed (uni-modal) and reversed-J shaped density and its hazard rate function can be increasing and increasing-decreasing-increasing. They worked on the estimation of the model parameters based on complete data sets. In this paper, by using lower record values and inter-record times, we develop inference procedures for the estimation of the parameters and prediction of future record values for the UG distribution. First, we derive the exact explicit expressions for the single and product moments of lower record values, and then use these results to compute the means, variances and covariances between two lower record values. Next, we obtain the maximum likelihood estimators and associated asymptotic confidence intervals. Further, we obtain the Bayes estimators under the assumption that the model parameters follow a joint bivariate density function. The Bayesian estimation is studied with respect to both symmetric (squared error) and asymmetric (linear-exponential) loss functions with the help of the Tierney-Kadane’s method and Metropolis-Hastings algorithm. Finally, we compute Bayesian point predictors for the future record values. To illustrate the findings, one real data set is analyzed, and Monte Carlo simulations are performed to compare the performances of the proposed methods of estimation and prediction.
MSC:
62G32 Statistics of extreme values; tail inference
62F10 Point estimation
62F15 Bayesian inference
62F25 Parametric tolerance and confidence regions
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