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In research methods and biostatistics, validity refers to the extent to which a diagnostic test accurately identifies or measures a condition or disease. Ensuring the validity of a diagnostic test is critical in clinical and epidemiological studies, as it determines the usefulness of the test in decision-making. The validity of diagnostic tests is assessed using several statistical measures, including sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and overall accuracy. Sensitivity is the ability of a test to correctly identify individuals who have the disease. It is calculated as the proportion of true positives ____ __________ __________ ________ __________ ________ _______ __________ _____ ______ ______ ______.
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