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  • Star-shaped order for distributions characterized by several parameters and some applications

  • Idir Arab, Milto Hadjikyriakou, Paulo Eduardo Oliveira, Beatriz Santos
  • Journal:
    Probability in the Engineering and Informational Sciences / Volume 37 / Issue 1 / January 2023
    Published online by Cambridge University Press:
    28 September 2021, pp. 49-59
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  • The star-shaped ordering between probability distributions is a common way to express aging properties. A well-known criterion was proposed by Saunders and Moran [(1978). On the quantiles of the gamma and F distributions. Journal of Applied Probability 15(2): 426–432], to order families of distributions depending on one real parameter. However, the lifetime of complex systems usually depends on several parameters, especially when considering heterogeneous components. We extend the Saunders and Moran criterion characterizing the star-shaped order when the multidimensional parameter moves along a given direction. A few applications to the lifetime of complex models, namely parallel and series models assuming different individual components behavior, are discussed.