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Specificity of a test
Specificity is a characteristic of a clinical test used to diagnose a problem. The specificity is the ability of a test not to be positive in those who do not have the problem. It is thus a true negative rate. When a test is 100% specific it is able to identify all those who do not have the condition of interest. When specificity is extremely high (>0.95 or 95%) a positive test result gives a definite positive diagnosis. Poor specificity indicates a test that fails to exclude many individuals without the disease of interest. |
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