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The PPV and NPV are not intrinsic to the test (as true positive rate and true negative rate are); they depend also on the prevalence. [2] Both PPV and NPV can be derived using Bayes' theorem . Although sometimes used synonymously, a positive predictive value generally refers to what is established by control groups, while a post-test ...
PPV is best understood by comparison to two other approaches where a penalty is applied for risk: The risk-adjusted rate of return applies a risk-penalty by increasing the discount rate when calculating the Net Present Value (NPV); The certainty equivalent approach does this by adjusting the cash-flow numerators of the NPV formula.
Open source multi-backend library for viewing and manipulating PDF files. Bundled with a viewer with the same name for the X Window System. PDF Studio: Proprietary: Yes Yes Software for viewing and editing PDF documents Inkscape: GNU GPL: Yes Technically not a PDF editor, but can be used as such page by page Adobe Reader: Proprietary freeware Yes
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In a classification task, the precision for a class is the number of true positives (i.e. the number of items correctly labelled as belonging to the positive class) divided by the total number of elements labelled as belonging to the positive class (i.e. the sum of true positives and false positives, which are items incorrectly labelled as belonging to the class).
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On the other hand, this hypothetical test demonstrates very accurate detection of cancer-free individuals (NPV ≈ 99.5%). Therefore, when used for routine colorectal cancer screening with asymptomatic adults, a negative result supplies important data for the patient and doctor, such as ruling out cancer as the cause of gastrointestinal ...