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http://en.wikipedia.org/wiki/Bayes'_theorem#Example_.232:_Drug_testing http://en.wikipedia.org/wiki/Bayes'_theorem#Example_.232:_Dr... Basically, an extremely

by graywh 18y ago

http://en.wikipedia.org/wiki/Bayes'_theorem#Example_.232:_Drug_testing http://en.wikipedia.org/wiki/Bayes'_theorem#Example_.232:_Dr... Basically, an extremely low rate of incidence (in Cory's example, 1 in a million) will render a "highly accurate" test meaningless.