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Specificity




:{ m specificity}= rac{ m number\ of\ true\ negatives}

For a test to determine who has a certain disease, a specificity of 100% means that all healthy people are labeled as healthy.

Specificity alone does not tell us all about the test, because a 100% specificity can be trivially achieved by labeling all test cases negative. Therefore, we also need to know the Sensitivity of the test.

A test with a high specificity has a low Type I Error .


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