A stochastic block model for interaction lengths

Jeudi 14 novembre 2019, 10:15 à 11:15

Salle de séminaires M.0.1

Michael Fop

University College Dublin

We propose a new stochastic block model that focuses on the analysis of interaction lengths in dynamic networks. The model does not rely on a discretization of the time dimension and may be used to analyze networks that evolve continuously over time. The framework relies on a clustering structure on the nodes, whereby two nodes belonging to the same latent group tend to create interactions and non-interactions of similar lengths. We introduce a variational expectation-maximization algorithm to perform inference, and adapt a widely used clustering criterion to perform model choice. Finally, we validate our methodology using simulated data experiments and showing two illustrative applications concerning face-to-face interaction data and a bike sharing network.

Cet exposé rentre dans le cadre du projet RIN Asterics (17B01101GR) et de l'ANR SMILES (ANR-18-CE40-0014).