![]() ![]() PPVs and NPVs of medical tests depend on intrinsic properties of the test as well as the prevalence of the condition being tested for. The precision of a medical test is usually calculated in the form of positive predictive values (PPVs) and negative predicted values (NPVs). False positives and false negatives can be described by the statistical concepts of type I and type II errors, respectively, where the null hypothesis is that the patient will test negative. However, tests will sometimes yield incorrect results in the form of false positives or false negatives.
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