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The other type of statistical test has been called �interval approach�
or �scan test.� This type of test focuses on creating a series of time
intervals (again predetermined by the investigator) with the null
hypothesis of equal distribution. Again, if the �a� cell (i.e. most
recent time) is statistically the largest, then there is a disease
cluster. In other words, there is a statistical relationship in time
between the cases. There are several of these statistical tests; some
of the most famous are listed by name.
There are also references with a more detailed discussion of these
tests, as well as a statistical software package available through the
US Agency for Toxic Substances and Diseases Registry (ATSDR) (Atlanta,
Georgia).
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