9 research outputs found
Lattices of Graphical Gaussian Models with Symmetries
In order to make graphical Gaussian models a viable modelling tool when the
number of variables outgrows the number of observations, model classes which
place equality restrictions on concentrations or partial correlations have
previously been introduced in the literature. The models can be represented by
vertex and edge coloured graphs. The need for model selection methods makes it
imperative to understand the structure of model classes. We identify four model
classes that form complete lattices of models with respect to model inclusion,
which qualifies them for an Edwards-Havr\'anek model selection procedure. Two
classes turn out most suitable for a corresponding model search. We obtain an
explicit search algorithm for one of them and provide a model search example
for the other.Comment: 29 pages, 18 figures. Restructured Section 5, results unchanged;
added references in Section 6; amended example in Section 6.
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Premier article
Propriétés immunomodulatrices des tétracyclines et différence de réponse entre patients atteints de parodontite et sujets. sains Mémoire présenté à la Faculté des études supérieures de l'Université Laval dans le cadre du programme des études en sciences dentaires pour l'obtention du grade de maître ès sciences (M. Sc.