Rules expressed as if evidence list then there
is suggestive evidence with probability, p for symptom .
MYCIN uses rules to reason backward to clinical data evidence from its
goal of predicting a disease-causing organism.
Certainty factors initially supplied by experts changed according to
previous formulae.
How do we perform reasoning when several rules are
chained together?
Measures of belief and disbelief given several observations are
calculated as follows:
How about our belief about several hypotheses taken together?
Measures of
belief given several hypotheses and to be combined logically are
calculated as follows:
then there
is suggestive evidence with probability, p for symptom 
.
