
THE FIELDS
INSTITUTE
FOR RESEARCH IN MATHEMATICAL SCIENCES 
April
1618, 2012
Workshop on Graphical Models:
Mathematics, Statistics and Computer Sciences
Organizing
Committee:
Frank Critchley,The Open University
Hélène Massam, York University
Frantisek Matús, Academy of Sciences of The Czech
Republic
Jim Smith, University of Warwick



Outline of the Program
Each day will consists of 45 minutes’ talks followed by 5
minutes of discussion. Each day should be followed by informal discussions
held in a large room. Meals will be taken in common at 12:00 p.m.
and 6 p.m..
Speaker Abstracts
Workshop Program:
Monday April 16, 2012 
8:50 
Welcome Introductions
Stewart Library, 3rd Floor 
9:00 a.m. 
Stephen E., Fienberg,
Department of Statistics, Carnegie Mellon University
Graphical Models for Network Data slides 
9:50
a.m. 
BREAK 
10:10 a.m. 
Wicher Bergsma, London
School of Economics
Marginal models: some interesting theoretical problems arising
from applications slides 
11:00
a.m. 
Frank Critchley
(Open University, UK) and Paul Marriott (Waterloo, Canada)
Computational Information Geometry and Graphical Models
slides 
11:50 
LUNCH Room 210,
2nd Floor 
1:30 p.m. 
Steffen Lauritzen, University of Oxford
Graphical Gaussian Models with Symmetry and Unknown Means
slides

2:20 p.m. 
Piotr Zwiernik, TU Eindhoven
Graphical Gaussian models and their groups slides

3:10
p.m. 
BREAK

3:50 p.m. 
Bala Rajaratnam, Stanford University
Positive definite completion problems for directed acyclic
graphs slides 
4:40 p.m. 
Sofia Massa, University of Oxford
Estimating combination of graphical models
slides 
5:50
p.m. 
DINNER Room 210,
2nd Floor 
Tuesday
April 17, 2012 
9:00 a.m. 
Henry Wynn,
London School of Economics, UK
Hierarchical models and monomial ideals slides 
9:50
a.m. 
BREAK

10:10 a.m. 
Ruriko Yoshida, University
of Kentucky
Finiteness on homogeneous Markov chain models slides 
11:00 a.m. 
Thomas Kahle, ETH
Zürich
Positive margins and primary decompositions (blackboard
talk) 
11:50
a.m. 
LUNCH
Room 210, 2nd Floor 
1:15 p.m. 
Nanny Wermuth,
Chalmers Technical University Gothenburg International Agency
of Research on Cancer Lyon
Traceable regression slides 
2:00 p.m. 
Milan Studeny, Academy of Sciences of the Czech Republic/Institute
of Information Theory and Automation.
Integer programming approach to statistical learning graphical
models slides

2:50 p.m. 
Kayvan Sadeghi,
University of Oxford
Stable Mixed Graphs slides 
3:40
p.m. 
BREAK 
4:20 p.m. 
Robin Evans,
University of Cambridge
Constraints on Marginalized DAGs slides 
5:10 p.m. 
Johannes
Rauh, Max Planck Institute for Mathematics in the Sciences,
Leipzig
The expressive power of mixture models and Restricted Boltzmann
Machines slides 
6:20
p.m. 
DINNER Room
210, 2nd Floor 
Wednesday
April 18, 2012 
9:00 a.m. 
Seth Sullivant,
North Carolina State University
Identifiability of Large Phylogenetic Mixture Models
slides 
9:50
a.m. 
BREAK

10:10 a.m. 
Alessandro Rinaldo, Carnegie
Mellon University
Maximum Likelihood Estimation in LogLinear Models slides 
11:00 a.m. 
Frantisek Matús,
Institute of Information Theory and Automation, Academy of Sciences
of the Czech Republic
Around boundaries of exponential families slides

11:50 
LUNCH

1:30 p.m. 
Jing Xi, University of Kentucky
Estimating the number of zeroone multiway tables via
sequential importance sampling slides

2:00 p.m. 
Luigi Malago,
Department of Electronics and Information, Politecnico di Milano
Graphical Models and ModelBased Search Algorithms slides 
2:30 p.m. 
Mehdi Molkaraie,
Department of Information Technology and Electrical Engineering,
ETH Zurich
Importance Sampling to Estimate the Entropy Function in Graphical
Models with Cycles slides 
3:00
p.m. 
BREAK 
3:30 p.m. 
Gerard Letac,
Institut de Mathmatiques de Toulouse
Characteristic functions of convex sets and applications
to contingency tables slides 
4:30
p.m. 
DINNER

Final list of Workshop Attendees:
Full Name 
University Name 
Bergsma, Wicher 
London School of Economics and Political Science 
Briollais, Laurent 
Samuel Lunenfeld Research Institute 
Critchley, Frank 
The Open University 
Evans, Robin 
University of Cambridge 
Fienberg, Stephen 
Carnegie Mellon University 
Friedlander, Matt 
York University 
Kahle, Thomas 
ETH Zürich 
Lauritzen, Steffen 
University of Oxford 
Letac, Gérard 
Université Paul Sabatier 
Malagò, Luigi 
Politecnico di Milano 
Maroufy, Vahed 
University of Waterloo 
Marriott, Paul 
University of Waterloo 
Massa, Sofia 
University of Oxford 
Massam, Hélène 
York University 
Matus, Frantisek 
Academy of Sciences of Czech Republic 
Mitsakakis, Nicholas 
University of Toronto 
Molkaraie, Mehdi 
ETH Zürich 
Mudalige, Nishan 
York University 
Pinder, Shaun 
University of Guelph 
Rajaratnam, Bala 
Stanford University 
Rauh, Johannes 
Max Planck Institute for Mathematics in the Sciences 
Rinaldo, Alessandro 
Carnegie Mellon University 
Rush, Stephen 
University of Guelph 
Sadeghi, Kayvan 
University of Oxford 
Smith, Jim Q. 
University of Warwick 
Studeny, Milan 
Academy of Sciences of Czech Republic 
Sullivant, Seth 
North Carolina State University 
Wermuth, Nanny 
Chalmers/University of Gothenburg 
Wynn, Henry 
The London School of Economics and Political Science 
Xi, Jing 
University of Kentucky 
Yoshida, Ruriko 
University of Kentucky 
Zwiernik, Piotr 
Institute for Pure and Applied Mathematics 
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