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The University of Southampton
Mathematical Sciences

S3RI Seminar - Revealing subgroup structure in ranked data using a Bayesian WAND, Professor Richard Boys (Newcastle) Seminar

S3RI Seminar
Time:
14:00 - 15:00
Date:
1 June 2017
Venue:
Room 5027, Lecture Theatre 5A, Building 54, Mathematical Sciences, University of Southampton, SO17 1BJ

For more information regarding this seminar, please telephone Professor Dankmar Boehning on 023 8059 6712 or email D.A.Bohning@southampton.ac.uk .

Event details

Ranked data arise in many areas of application ranging from the ranking of up-regulated genes for cancer to the ranking of academic statistics journals. Complications can arise when rankers don't report a full ranking of all entities; for example, they might only report their top 10 ranked entities after seeing some or all entities. It can also be useful to know whether rankers are equally informative and whether some entities are effectively judged to be exchangeable. Recent work has looked at how to produce an aggregate (overall) ranking but this is not a very useful summary when there is important subgroup structure. This talk will outline some current work studying this problem using Bayesian non-parametrics, specifically, a Weighted Adapted Nested Dirichlet (WAND) process mixture of Plackett-Luce models. Fortunately an efficient Gibbs sampling scheme is available after introducing some latent variables. The method will be illustrated using real world examples available in the literature.

Speaker information

Professor Richard Boys, Professor of Applied Statistics, University of Newcastle.

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