| Choosing Variables |
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| • | From
Cooper [1984]: |
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| "Metastatic
cancer is a possible cause of a brain |
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| tumor
and is also an explanation for increased |
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| total
serum calcium. In turn, either of
these could |
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| explain
a patient falling into a coma.
Severe |
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| headache
is also possible associated with a brain |
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| tumor." |
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| • | What
are our variables? |
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| • | What
are the direct causal influences between |
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| them? |
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