Re: What do the measures mean?

Will Dwinnell (76743.1740@compuserve.com)
Mon, 26 Oct 1998 00:25:07 +0100 (MET)

Stefan van den Oord wrote:
"I think there are three kinds of uncertainty: chance,
possibility and certainty."

The whole mass of things which we call 'uncertainty' has been cut
up many ways. Klir has done some interesting work in teasing
apart these issues. See: "Fuzzy Sets, Uncertainty, and
Information" by Klir and Folger, pub. by Prentice Hall and "Fuzzy
Sets and Fuzzy Logic" by Klir and Yuan, published by Prentice
Hall.

Chance (randomness) is certainly one form of uncertainty. This
has been addressed in a number of systems, such as the various
probabilities and Dempster-Shafer evidential reasoning. Fuzzy
logic deals largely with information which is poorly specified.
For example, the question 'Is this man tall?' deals with a set of
people which are labeled 'tall'. Someone who is 7 feet tall is
certainly tall, but what about someone who is 5'11"? They may be
considered 'partially tall'- that is what fuzzy logic deals with.

-- 
Will Dwinnell

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