There's a generalization of noisy-or to non-binary variables
and arbitrary deterministic functions (i.e. noisy-f instead of 
noisy-or):

   Srinivas, Sampath."A generalization of the noisy-or model". UAI-93.
    San Franciso: Morgan Kaufmann.

Hope this helps!

Charles


On Tuesday, February 4, 2003, at 05:56 PM, Sean Li wrote:

> Dear all,
>
> Could anybody give me some pointers to the work of the Noise or 
> assumption
> applied to non-binary nodes in estimating conditional probabilities? 
> Thank
> you very much.
>
> Sean Li
>
 -- 
Charles Sutton
University of Massachusetts, Amherst
[EMAIL PROTECTED]
URL: http://www.cs.umass.edu/~casutton/

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