You are here

Choosing the number of groups in a latent stochastic block model for dynamic networks.

Authors: 

R Rastelli, P Latouche, Nial Friel

Publication Type: 
Refereed Original Article
Abstract: 
Latent stochastic block models are flexible statistical models that are widely used in social network analysis. In recent years, efforts have been made to extend these models to temporal dynamic networks, whereby the connections between nodes are observed at a number of different times. In this paper we extend the original stochastic block model by using a Markovian property to describe the evolution of nodes’ cluster memberships over time. We recast the problem of clustering the nodes of the network into a model-based context, and show that the integrated completed likelihood can be evaluated analytically for a number of likelihood models. Then, we propose a scalable greedy algorithm to maximise this quantity, thereby estimating both the optimal partition and the ideal number of groups in a single inferential framework. Finally we propose applications of our methodology to both real and artificial datasets.
Digital Object Identifer (DOI): 
10.xxx
Publication Status: 
Published
Date Accepted for Publication: 
Friday, 10 February, 2017
Publication Date: 
22/03/2017
Journal: 
Network Science.
Institution: 
National University of Ireland, Dublin (UCD)
Open access repository: 
No