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== Specificity and Sensitivity ==

Medical journals often report the ''Specificity'' and ''Sensitivity'' of tests for things like HIV or the Zika virus.  These measures describe the rates of Type I and Type II errors.

* Specificity, or s'''P'''ecificity, concerns the rate of false '''P'''ositives.

* Sensitivity or se'''N''sitivity concerns the rate of false '''N'''egatives.