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Figure 11-3. Probability of having a heart attack (also known as MI,
or myocardial infarction) as a function of the size of the dose of a bad
drug
It looks like, from this vantage point, the higher the dose, the fewer
heart attacks the patient has. But there are two clusters, and if you
know more about those two clusters, you find the opposite conclusion,
as you can see in
Figure 11-4
.
Figure 11-4. Probability of having a heart attack as a function of the
size of the dose of a bad drug and whether or not the patient also took
aspirin
