Change Point Detection on A Separable Model for Dynamic Networks
Abstract: This paper studies the unsupervised change point detection problem in time series of networks using the Separable Temporal Exponential-family Random Graph Model (STERGM). Inherently, dynamic network patterns can be complex due to dyadic and temporal dependence, and change points detection can identify the discrepancies in the underlying data generating processes to facilitate downstream analysis. Moreover, the STERGM that utilizes network statistics to represent the structural patterns is a flexible and parsimonious model to fit dynamic networks. We propose a new estimator derived from the Alternating Direction Method of Multipliers (ADMM) procedure and Group Fused Lasso (GFL) regularization to simultaneously detect multiple time points, where the parameters of a time-heterogeneous STERGM have changed. We also provide a Bayesian information criterion for model selection and an R package \texttt{CPDstergm} to implement the proposed method. Experiments on simulated and real data show good performance of the proposed framework.
Submission Length: Long submission (more than 12 pages of main content)
Assigned Action Editor: ~Yan_Liu1
Submission Number: 4269
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