********* UCL STATISTICS SEMINAR ********
All are welcome
Please see our web page for details of further seminars and how to find us:
www.ucl.ac.uk/stats/research/journals.html
Monday 4th December 2000 - 4 p.m., Room 102, 1-19 Torrington Place,
Department of Statistical Science - University College London
Speaker: Robert Cowell, City University
On searching for optimal classifiers among Bayesian networks
Abstract:
There is much interest in constructing from datasets Bayesian networks
which are efficient, or even optimal, for classication purposes. Most search
strategies usually discriminate between networks by comparing their
marginal likelihood score, but recently it has been suggested that search
strategies for classifiers should instead select among models using
alternative scores. This paper contributes to this discussion by presenting
the results of simulations on the sets of all directed acyclic graphs on
four
and five nodes. Our results add evidence to earlier indications that the
marginal likelihood is likely to be a poor criterion to use for classifier
selection.
Dr Andrew Copas
Lecturer in Medical Statistics & MSc Admissions Tutor
Departments of Statistical Science & Sexually Transmitted Diseases
University College London
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