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Let:
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A =
Patient has metastatic cancer
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B =
Patient has increased total serum calcium
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C =
Patient has a brain tumor
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D =
Patient lapses occasionally into coma
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E =
Patient has a severe headache
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What
are the direct causal links between these
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variables?
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"Metastatic
cancer is a possible cause of a brain tumor and is also an
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explanation
for increased total serum calcium.
In turn, either of these could
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explain
a patient falling into a coma.
Severe headache is also possible
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associated
with a brain tumor."
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Draw
the belief net.
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