Disputation: Dennis Christensen

Doctoral candidate Dennis Christensen at the Department of Mathematics will be defending the thesis Zero or One, Up or Down. Statistical Inference for Binary Data with Applications in Sensitivity Analysis of Energetic Materials for the degree of Philosophiae Doctor.

picture of the candidate

Doctoral candidate Dennis Christensen.

The PhD defence will be in Abels utsikt - Niels Henrik Abels hus. The host of the session will moderate the technicalities while the chair of the defence will moderate the disputation.

Ex auditorio questions: the chair of the defence will invite the audience to ask questions ex auditorio at the end of the defence.

Trial lecture

29th of May, time: 10:15 am, room 1259 (Abels utsikt).

Bayesian causal inference in the potential outcome framework

Main research findings 

This thesis is about statistical analysis of binary data, and presents both new methodological advances and practical applications. On the methodological side, the thesis presents a new importance sampling algorithm for estimating the marginal likelihood when using Bayesian nonparametric models for binary trials. This method relies on counting the symmetries arising from binary responses, thus turning a statistical problem into a combinatorial one. There are also theoretical developments regarding the large-sample theory of adaptive designs in binary regression, which are commonly employed in medicine, toxicology and industry.

Regarding applications, the thesis focuses on enhancing statistical estimates of the sensitivity of explosives, with a particular emphasis on explosive remnants of war and dumped ammunition. It demonstrates that remnants of the high explosive amatol (widely used in both World Wars) are more sensitive to impact than previously assumed. Furthermore, the thesis presents recommendations for updating NATO's protocol for sensitivity measurements, so that researchers can extract more information from their experimental data.

Adjudication committee

  • Professor Sonia Petrone, Bocconi University 
  • Professor Antoine E. D. M. van der Heijden, The Netherlands Organization for Applied Scientific Research 
  • Professor Sven Ove Samuelsen, University of Oslo

Supervisors

  • Professor Nils Lid Hjort, University of Oslo
  • Principal Scientist Erik Unneberg, Norwegian Defence Research Establishment

Chair of defence

Professor Erlend Fornæss Wold, University of Oslo

Host of the session

Professor Sven Ove Samuelsen, University of Oslo

 

Organizer

Department of Mathematics
Published May 13, 2024 8:37 AM - Last modified May 29, 2024 8:27 AM