Discussion
Which range do MYCIN certainty factors occupy?
Answer: A
A certainty factor runs from -1 for complete disbelief through 0 for no evidence to +1 for certainty, and it is the difference between a belief measure and a disbelief measure, each of which lies in the unit interval. The signed range lets confirming and disconfirming evidence be expressed on one scale. A unit interval, a percentage or an unbounded scale would each lose part of that convenience. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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