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Variational inference for stochastic block models from sampled data. (English) Zbl 1437.62072

Summary: This article deals with nonobserved dyads during the sampling of a network and consecutive issues in the inference of the stochastic block model (SBM). We review sampling designs and recover missing at random (MAR) and not missing at random (NMAR) conditions for the SBM. We introduce variants of the variational EM algorithm for inferring the SBM under various sampling designs (MAR and NMAR) all available as an R package. Model selection criteria based on integrated classification likelihood are derived for selecting both the number of blocks and the sampling design. We investigate the accuracy and the range of applicability of these algorithms with simulations. We explore two real-world networks from ethnology (seed circulation network) and biology (protein-protein interaction network), where the interpretations considerably depend on the sampling designs considered.

MSC:

62D10 Missing data
68T20 Problem solving in the context of artificial intelligence (heuristics, search strategies, etc.)
62K10 Statistical block designs
62F15 Bayesian inference
65K10 Numerical optimization and variational techniques

Software:

missSBM; STRING; R
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References:

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