Abstract
The Birnbaum–Saunders (BS) distribution, introduced in 1969, is a popular univariate fatigue life distribution which has been widely used to model right-skewed lifetime and reliability data. In this paper, a new class of generalized multivariate BS distributions is proposed based on mean-variance mixture models to accommodate strongly skewed and heavy tailed multivariate lifetime data. Some special cases of this class as well as their properties are then discussed. We present a hierarchical representation which facilitates an efficient EM-type algorithm for the computation of maximum likelihood estimates. Empirical results from a simulation study and real data analyses show that this class of distributions outperforms many existing extensions of the BS distribution in modeling lifetime data.
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Sasaei, M., Pourmousa, R., Balakrishnan, N. et al. A robust class of multivariate fatigue distributions based on normal mean-variance mixture model. J. Korean Stat. Soc. 50, 44–68 (2021). https://doi.org/10.1007/s42952-020-00063-8
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DOI: https://doi.org/10.1007/s42952-020-00063-8
Keywords
- EM-type algorithm
- Birnbaum–Saunders distribution
- Normal mean-variance mixture distribution
- Maximum likelihood estimators
- Robust estimation