Dempster-Shafer Models

This can be regarded as a more general approach to representing uncertainty than the Bayesian approach.

Bayesian methods are sometimes inappropriate:

Let A represent the proposition Demi Moore is attractive.

Then the axioms of probability insist that

Now suppose that Andrew does not even know who Demi Moore is.

Then

• We cannot say that Andrew believes the proposition if he has no idea what it means.
• Also, It is not fair to say that he disbelieves the proposition.
• It would therefore be meaningful to denote Andrew's belief of B(A) and as both being 0.
• Certainty factors do not allow this.

 
• Dempster-Shafer Calculus
• Combining beliefs