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MMinhat 1
UNCERTAINTY in Knowledge-Based System (KBS)
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Sources of uncertainty
• Lack of/incompleteness of data• Inconsistency of data• Imprecision of measurement• Imprecision of concept• Combination of information from multiple
sources• Lack of fundamental supporting theory
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Illustration of uncertainty
• Truly random situation (e.g. motion of gas molecules, distribution of people’s height)
• Situation which are not random but for which there are insufficient data (e.g. the likelihood a person has appendices)
• Situation whether the knowledge involved represents an intuitive feeling)
• Situation where the terminology involved is vague (e.g. description such as large, tall, big)
• Situation where the sources of knowledge is not totally reliable (e.g. someone who is honest but absent minded)
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Thank You
• Q & As?
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