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Hierarchical Archimax copulas
Marius Hofert, Raphael Huser, Avinash Prasad · 2017-07-03 · via math.PR updates on arXiv.org

The class of Archimax copulas is generalized to hierarchical Archimax copulas in two ways. First, a hierarchical construction of $d$-norm generators is introduced to construct hierarchical stable tail dependence functions which induce a hierarchical structure on Archimax copulas. Second, by itself or additionally, hierarchical frailties are introduced to extend Archimax copulas to hierarchical Archimax copulas in a similar way as nested Archimedean copulas extend Archimedean copulas. Possible extensions to nested Archimax copulas are discussed. Additionally, a general formula for the density and its evaluation of Archimax copulas is introduced.

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