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Measures of diagnostic test performance

Accuracy and precision

Accuracy relates to the ability of the test to provide a result that is close to the truth (the true value). Accuracy is generally assessed in the long run, meaning that it can be thought of as the average of multiple test results. A test is therefore considered to be accurate when the average of repeated tests is close to the true value. Any one test result may itself not be as accurate as the average of repeated tests performed on the same sample.