test validity

How is Test Validity Measured?

Test validity is often measured using a 2x2 table that categorizes test outcomes as true positives, true negatives, false positives, and false negatives. The calculations for sensitivity and specificity are as follows:
Sensitivity = True Positives / (True Positives + False Negatives)
Specificity = True Negatives / (True Negatives + False Positives)

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