Abstract
Traditional survival testing approaches have generally placed a premium on the frequency of failures over time. During the investigation of such cases, a lack of awareness of related observed and unobserved covariates may be detrimental. In this scenario, frailty models are a decent choice for examining the effect of unobserved covariates. We can easily find baseline distributions for such models. However, due to certain constraints such as the identifiability condition and the requirement that their Laplace transform exists, finding a frailty distribution can be difficult. As a result, in this paper, we introduce a new frailty weighted Lindley distribution for reversed hazard rate setup that outperforms the gamma frailty distribution. So, our main motive is to establish a new frailty distribution under reversed hazard rate setup. Generalized inverse Rayleigh and modified inverse Weibull baseline distributions are proposed as a useful tool for ensuring the effect of unobserved heterogeneity. The model parameters are estimated using the Bayesian framework of Markov Chain Monte Carlo methodology. Following that, Bayesian comparison methods are used to compare models. To explain the findings and show that better models are recommended, the famous Australian twin data set is used.
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We owe a debt of gratitude to the anonymous referees who made numerous suggestions for improvement.
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Part of special issue guest edited by Dieter Rasch, Jürgen Pilz, and Subir Ghosh—Advances in Statistical and Simulation Methods.
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Tyagi, S., Pandey, A. & Chesneau, C. Identifying the Effects of Observed and Unobserved Risk Factors Using Weighted Lindley Shared Regression Model. J Stat Theory Pract 16, 16 (2022). https://doi.org/10.1007/s42519-021-00241-9
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DOI: https://doi.org/10.1007/s42519-021-00241-9