Complex Systems and Networks Seminar: Darko Hric, Aalto University
The seminar is a combination of scholars talking about their own work and journal club presentations. Everybody is welcome to attend the seminar.
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The Complex Systems and Networks Seminar is held every Thursday at 14.00-15:00 in room A136 (T6) in CS building.
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Stochastic Block Model Reveals the Map of Citation Patterns and Their Evolution in Time
Darko Hric
Aalto University
Abstract:
We map out the large-scale structure of citation networks of journals and their evolution in time using stochastic block models (SBMs). SBM fitting procedures are principled methods which can be used for finding hierarchical grouping of journals into blocks that have similar incoming and outcoming citations patterns, and they work directly on the citation network without the need to construct auxiliary networks based on similarities of nodes. We fit SBMs to networks of journals we construct from a data set of around 630 million citations and find a variety of different types of blocks, such as clusters, bridges, sources and sinks. We use a recent generalization of SBMs to determine how well a manually curated classification of journals into subfields of science is related to the block structure of the journal network and how this relationship changes in time. The SBM method tries to find the network of blocks that is the best high-level representation of the network of journals, and we illustrate how these block networks (at various resolution levels) can be used as maps of science.