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August 2020 Two-sample hypothesis testing for inhomogeneous random graphs
Debarghya Ghoshdastidar, Maurilio Gutzeit, Alexandra Carpentier, Ulrike von Luxburg
Ann. Statist. 48(4): 2208-2229 (August 2020). DOI: 10.1214/19-AOS1884


The study of networks leads to a wide range of high-dimensional inference problems. In many practical applications, one needs to draw inference from one or few large sparse networks. The present paper studies hypothesis testing of graphs in this high-dimensional regime, where the goal is to test between two populations of inhomogeneous random graphs defined on the same set of $n$ vertices. The size of each population $m$ is much smaller than $n$, and can even be a constant as small as 1. The critical question in this context is whether the problem is solvable for small $m$.

We answer this question from a minimax testing perspective. Let $P$, $Q$ be the population adjacencies of two sparse inhomogeneous random graph models, and $d$ be a suitably defined distance function. Given a population of $m$ graphs from each model, we derive minimax separation rates for the problem of testing $P=Q$ against $d(P,Q)>\rho $. We observe that if $m$ is small, then the minimax separation is too large for some popular choices of $d$, including total variation distance between corresponding distributions. This implies that some models that are widely separated in $d$ cannot be distinguished for small $m$, and hence, the testing problem is generally not solvable in these cases.

We also show that if $m>1$, then the minimax separation is relatively small if $d$ is the Frobenius norm or operator norm distance between $P$ and $Q$. For $m=1$, only the latter distance provides small minimax separation. Thus, for these distances, the problem is solvable for small $m$. We also present near-optimal two-sample tests in both cases, where tests are adaptive with respect to sparsity level of the graphs.


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Debarghya Ghoshdastidar. Maurilio Gutzeit. Alexandra Carpentier. Ulrike von Luxburg. "Two-sample hypothesis testing for inhomogeneous random graphs." Ann. Statist. 48 (4) 2208 - 2229, August 2020.


Received: 1 June 2018; Revised: 1 February 2019; Published: August 2020
First available in Project Euclid: 14 August 2020

MathSciNet: MR4134792
Digital Object Identifier: 10.1214/19-AOS1884

Primary: 62H15
Secondary: 05C80 , 60B20 , 62C20

Keywords: inhomogeneous Erdős–Rényi model , minimax testing , two-sample test

Rights: Copyright © 2020 Institute of Mathematical Statistics


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Vol.48 • No. 4 • August 2020
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