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Scenario:
An investigator is exploring spatial patterns of breast cancer
incidence in Long Island. She generates maps of cases and control locations
georeferenced to place of residence. Upon visual inspection, the maps
strongly suggest an excess of cases concentrated in a single neighborhood.
It turns out this neighborhood includes a dry cleaning establishment that in
the past dumped suspected carcinogens into the soils and groundwater.
Question:
- Can the investigator draw any valid conclusions by relating apparent
map pattern to the location of the dry cleaning establishment?
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