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    • Semigroups of semi-copulas and evolution of dependence at increase of age 

      Foschi, R.; Spizzichino, Fabio (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2008)
      Open Access
      We consider a pair of exchangeable lifetimes X; Y and the families of the conditional survival functions F t(x;y) of (X t; Y t) given (X > t; Y > t).We analyze some properties of dependence and of ageing for F t(x;y) ...