糖心TV Complexity Science Events
Complexity Centre and MathSys CDT events carry priority over room D1.07.
To book D1.07 please email Sheetal dot Sharma at warwick dot ac dot uk
Please note that your event booking is for D1.07 only. The adjacent common room is a private area for the MathSys Centre that cannot used as part of your booking.
Complexity Forum: Sofia Olhede (University College London)
Speaker: Sofia Olhede (University College London)
Title: Making sense of networks: random variation and variable structure
Abstract: To simplify our understanding of relationships between many entities, it is convenient to represent them as a network. A link in the network represents that two entities are related; the absence thereof, the lack of such a relationship. Many networks are extremely sparse, with only a small fraction of all possible linkages found in the data. The analysis of network data is hampered by a lack of statistical theory, and computational tractability of analysis methods. The past five years have seen an explosion of developments, tackling both of these challenges. This has also highlighted outstanding problems in the field. In particular, there is a need for modelling convergence, as a plethora of different models for variation have been proposed, and their interrelationships remain unclear. I will discuss how the framework of exchangeable random networks link many existing models, and recent results from my group on the properties of analysis methods for such models. In particular I will highlight recent results showing the universality of stochastic blockmodel approximations, much outside the setting where a stochastic blockmodel generated the data. This is joint work with Patrick Wolfe (UCL).