%P 433-459
%T Conditionally identically distributed species sampling sequences
%I Applied Probability Trust
%V 42
%D 2010
%L eprints976
%X In this paper the theory of species sampling sequences is linked to the theory of conditionally identically distributed sequences in order to enlarge the set of species sampling sequences which are mathematically tractable. The conditional identity in distribution (see Berti, Pratelli and Rigo (2004)) is a new type of dependence for random variables, which generalizes the well-known notion of exchangeability. In this paper a class of random sequences, called generalized species sampling sequences, is defined and a condition to have conditional identity in distribution is given. Moreover, two types of generalized species sampling sequence that are conditionally identically distributed are introduced and studied: the generalized Poisson-Dirichlet sequence and the generalized Ottawa sequence. Some examples are discussed. 
%K Conditional identity in distribution; Poisson-Dirichlet sequence; random partition; random probability measure; randomly reinforced urn; species sampling sequence; stable convergence
%A Federico Bassetti
%A Irene Crimaldi
%A Fabrizio Leisen
%R doi:10.1239/aap/1275055237
%N 2
%J Advances in applied probability