Second-order Approximation of Exponential Random Graph Models

Wen-Yi Ding; Xiao Fang

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arXiv · 2401.01467

Second-order Approximation of Exponential Random Graph Models

Wen-Yi Ding·Xiao Fang

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Abstract

Exponential random graph models (ERGMs) are flexible probability models allowing edge dependency. However, it is known that, to a first-order approximation, many ERGMs behave like Erd\"os-R\'enyi random graphs, where edges are independent. In this paper, to distinguish ERGMs from Erd\"os-R\'enyi random graphs, we consider second-order approximations of ERGMs using two-stars and triangles. We prove that the second-order approximation indeed achieves second-order accuracy in the triangle-free case. The new approximation is formally obtained by Hoeffding decomposition and rigorously justified using Stein's method.

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BibTeX RIS

Wen-Yi Ding, Xiao Fang. 2024-01-03. Second-order Approximation of Exponential Random Graph Models. https://arxiv.org/abs/2401.01467

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