ruan tong wrote:
>
> Besides, how to simplify a network (descrease node state) if
> the conditional probability of some node state is always zero? Is it
> possible that just delete it? If it is, when the conditional
> probility of some node state is very very small, can it be dealed with
> as the zero suitation?
One possibility is to use a compact representation of
probability distributions, for instance, probability
trees. They provide a means of approximating
potentials by other ones of smaller size.
These issues are addressed in
Antonio Salmeron, Andres Cano, Serafin Moral (2000) Importance
sampling in Bayesian networks using
probability trees. Computational Statistics and Data Analysis 34,
387-413.
and
Andres Cano, Serafin Moral and Antonio Salmeron (2000) Penniless
Propagation in Join Trees.
International Journal of Intelligent Systems 15, 1027-1059.
Regards,
Antonio
--
Antonio Salmeron
Statistics and Applied Mathematics
University of Almeria (Spain)
http://www.ual.es/~asalmero
