# Li-Chun Zhang: Graph sampling

Li-Chun Zhang (Department of Social Statistics and Demographics, University of Southampton --- Department of Mathematics, University of Oslo) will give a talk on January 15th at 14:15 in the Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor.

Li-Chun Zhang is Professor of Social Statistics at the Department of Social Statistics and Demography of the University of Southampton and Professor II at the Department of Mathematics of the University of Oslo.

**Title: **Graph sampling

**Abstract:** For a statistical approach to graphs one may choose to model the entire population graph as a random realisation, or to exploit the variation over possible sample graphs taken from a given fixed population graph. Graph sampling theory deals with the latter perspective. In this talk, we synthesise the existing fragmented theory of graph sampling. We propose a formal definition of finite-graph sampling, and provide a classification of potential graph parameters. We develop a general approach of Horvitz-Thompson estimation to T-stage snowball sampling, and present a united BIG-reformulation of so-called “network" sampling methods in the literature in terms of the outlined graph sampling theory.

Download the flyer here.