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Validity
This is the ability of a test to diagnose or measure what it is intended to diagnose or measure.
There are various dimensions of validity, but criterion validity is critical to the accuracy of a diagnosis. This is the ability of a test to determine the presence or absence of a particular pathology. The value of a test is judged by its ability to diagnose the pathology compared to a "gold standard". The validity of the "gold standard" is meant to be about 100%. Validity is measured by sensitivity and specificity. |
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