Abstract
We consider the lambda-coalescent processes with positive frequency of
singleton clusters. The class in focus covers, for instance, the
beta$(a,b)$-coalescents with $a>1$. We show that some large-sample properties
of these processes can be derived by coupling the coalescent with an increasing
Lévy process (subordinator), and by exploiting parallels with the theory of
regenerative composition structures. In particular, we discuss the limit
distributions of the absorption time and the number of collisions.
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