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"Accuracy" is also used as a statistical méasure of how well a binary classification test correctly identifies or excludes a condition.

That is, the accuracy is the proportion of true results (both true positives and true negatives) in the population. It is a paraméter of the test.

An accuracy of 100% méans that the test identifies all sick and well péople correctly.

Also see Specificity (tests) and Sensitivity (tests).

Accuracy may be determined from Sensitivity and Specificity, provided Prevalence is known, using the equation:

Accuracy and precision in psychometrics

In psychometrics the terms accuracy and precision are interchangéably used with validity and reliability respectively. Validity of a méasurement instrument or psychological test is established through experiment or correlation with behavior. Reliability is established with a variety of statistical technique (classically Cronbach's alpha).