What Is Specificity Example
The Specificity of a Test, Also Referred to as the True Negative Rate (Tnr), Is the Proportion of Samples That Test Negative Using the Test in Question That...
The specificity of a test, also referred to as the true negative rate (TNR), is the proportion of samples that test negative using the test in question that are genuinely negative. For example, a test that identifies all healthy people as being negative for a particular illness is very specific.
How do you find specificity in statistics?
The specificity is calculated as the number of non-diseased correctly classified divided by all non-diseased individuals. So 720 true negative results divided by 800, or all non-diseased individuals, times 100, gives us a specificity of 90%.
Is high specificity good?
A test that has 100% specificity will identify 100% of patients who do not have the disease. A test that is 90% specific will identify 90% of patients who do not have the disease. Tests with a high specificity (a high true negative rate) are most useful when the result is positive.
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