Title: Sparse spatial random graphs
Authors: Francesca Panero - London School of Economics (United Kingdom) [presenting]
Francois Caron - University of Oxford (United Kingdom)
Judith Rousseau - University of Oxford (United Kingdom)
Abstract: A model is presented to describe spatial random graphs, exploiting the so-called ``graphex'' setting embedded in a Bayesian nonparametric framework, that allows for flexibility and interpretable parameters. We provide a number of asymptotic results, namely that the model is able to describe both sparse and dense networks (with various levels of sparsity), is equipped with positive global and local clustering coefficients and can have a power-law degree distribution whose exponent is easily tuned. We offer a way to perform posterior inference through an MCMC algorithm. We show the results of the estimation obtained on simulated and real data from airport connections. Finally, we discuss how our proposal relates to other spatial network models in the literature.