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• W2912477392 abstract "The discovery of the hidden population, whose size and membership are unknown, is made possible by assuming that its members are connected in a social network by their relationships. We explore these groups by a chain-referral sampling (CRS) method, where participants recommend the people they know. This leads to the study of a Markov chain on a random graph where vertices represent individuals and edges connecting any two nodes describe the relationships between corresponding people. We are interested in the study of CRS process on the stochastic block model (SBM), which extends the well-known Erdos-Renyi graphs to populations partitioned into communities. The SBM considered here is characterized by a number of vertices $N$, a number of communities (blocks) $m$, proportion of each community $pi=(pi_1,...,pi_m)$ and a pattern for connection between blocks $P=(lambda_{kl}/N)_{(k,l) in {1,...,m}^2}$. In this paper, we give a precise description of the dynamic of CRS process in discrete time on an SBM. The difficulty lies in handling the heterogeneity of the graph. We prove that when the population's size is large, the normalized stochastic process of the referral chain behaves like a deterministic curve which is the unique solution of a system of ODEs." @default.
• W2912477392 created "2019-02-21" @default.
• W2912477392 creator A5063267616 @default.
• W2912477392 date "2019-02-13" @default.
• W2912477392 modified "2023-09-25" @default.
• W2912477392 title "Chain-referral sampling on Stochastic Block Models" @default.
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