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Betweenness centrality is an important index widely used in different domains such as social networks, traffic networks and the world wide web. However, even for mid-size networks that have only a few hundreds thousands vertices, it is computationally expensive to compute exact betweenness scores. Therefore in recent years, several approximate algorithms have been developed. In this paper, first given a network G and a vertex r ∈ V(G), we propose a Metropolis-Hastings MCMC algorithm that<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1704.07351v3">arXiv:1704.07351v3</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/hydhecvhdnhttkp3bmofalewxq">fatcat:hydhecvhdnhttkp3bmofalewxq</a> </span>
more »... from the space V(G) and estimates betweenness score of r. The stationary distribution of our MCMC sampler is the optimal sampling proposed for betweenness centrality estimation. We show that our MCMC sampler provides an (ϵ,δ)-approximation, where the number of required samples depends on the position of r in G and in many cases, it is a constant. Then, given a network G and a set R ⊂ V(G), we present a Metropolis-Hastings MCMC sampler that samples from the joint space R and V(G) and estimates relative betweenness scores of the vertices in R. We show that for any pair r_i, r_j ∈ R, the ratio of the expected values of the estimated relative betweenness scores of r_i and r_j respect to each other is equal to the ratio of their betweenness scores. We also show that our joint-space MCMC sampler provides an (ϵ,δ)-approximation of the relative betweenness score of r_i respect to r_j, where the number of required samples depends on the position of r_j in G and in many cases, it is a constant.
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