15th Applied Statistics 2018
International Conference
September 23 - 26, 2018
Ribno (Bled), Slovenia
    

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      June 1

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     July 1
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Reconstructing Networks with Heterogeneous and Unknown Errors


Tiago P. Peixoto
Department of Mathematical Sciences
University of Bath, UK

The vast majority of network datasets contains errors and omissions, although this is rarely incorporated in traditional network analysis.
Recently, an increasing effort has been made to fill this methodological gap by developing network reconstruction approaches based on Bayesian inference.
These approaches, however, rely on assumptions of uniform error rates and on direct estimations of the existence of each edge via repeated measurements, something that is currently unavailable for the majority of network data.
Here we develop a Bayesian reconstruction approach that lifts these limitations by not only allowing for heterogeneous errors, but also for individual edge measurements without direct error estimates. Our approach works by coupling the inference approach with structured generative network models, which enable the correlations between edges to be used reliable error estimates. Although our approach is general, we focus on the stochastic block model as the basic generative process, from which efficient nonparametric inference can be performed, and yields a principled method to infer hierarchical community structure from noisy data. We demonstrate the efficacy of our approach in a variety of empirical and artificial networks.


 Applied Statistics 2018      http://conferences.nib.si/AS2018                                e-mail: info.AS@nib.si