Discussion
Which measure did MYCIN use to handle uncertainty?
Answer: C
Certainty factors combine a measure of belief and a measure of disbelief into a single number between minus one and one, propagated by simple combination formulae. They were adopted because the joint probabilities Bayes would need were unavailable. Fuzzy grades and belief functions are rival schemes. Certainty factors were later shown to be sound only under strong independence assumptions, which is why probability displaced them. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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