Model-Based Clustering of Nonparametric Weighted Networks With Application to Water Pollution Analysis. Issue 2 (2nd April 2020)

• Record Type: Journal Article
• Authors: Agarwal, Amal; Xue, Lingzhou
• Is Part Of: Technometrics. Volume 62:Issue 2(2020)
• Page Start: 161
• Page End: 172
• Publication Date: 2020-04-02
• Subjects: Environmental studies -- Exponential-family random graphical model -- Local likelihood -- Variational inference; Statistical physics -- Periodicals; Chemistry -- Statistical methods -- Periodicals; Engineering -- Statistical methods -- Periodicals; 519.5
• DOI: 10.1080/00401706.2019.1623076
• Languages: English
• ISSNs: 0040-1706

Abstract

Abstract: Water pollution is a major global environmental problem, and it poses a great environmental risk to public health and biological diversity. This work is motivated by assessing the potential environmental threat of coal mining through increased sulfate concentrations in river networks, which do not belong to any simple parametric distribution. However, existing network models mainly focus on binary or discrete networks and weighted networks with known parametric weight distributions. We propose a principled nonparametric weighted network model based on exponential-family random graph models and local likelihood estimation, and study its model-based clustering with application to large-scale water pollution network analysis. We do not require any parametric distribution assumption on network weights. The proposed method greatly extends the methodology and applicability of statistical network models. Furthermore, it is scalable to large and complex networks in large-scale environmental studies. The power of our proposed methods is demonstrated in simulation studies and a real application to sulfate pollution network analysis in Ohio watershed located in Pennsylvania, United States.