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The positive predictive value (PPV), or precision, is defined as = + = where a "true positive" is the event that the test makes a positive prediction, and the subject has a positive result under the gold standard, and a "false positive" is the event that the test makes a positive prediction, and the subject has a negative result under the gold standard.
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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.
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 ...
Download as PDF; Printable version; Appearance. move to sidebar hide. Predicted condition: Sources: Total population ... = PPV + NPV − 1: Diagnostic odds ratio (DOR)
A new study shows an extra 5 minutes of daily vigorous exercise helps control hypertension. The findings become more significant with an extra 10 and 20 minutes of heart-pumping physical activity ...
The fundamental prevalence-independent statistics are sensitivity and specificity.. Sensitivity or True Positive Rate (TPR), also known as recall, is the proportion of people that tested positive and are positive (True Positive, TP) of all the people that actually are positive (Condition Positive, CP = TP + FN).
recommended by the Center for Science in the Public Interest (2003). Yet despite ongoing legislative debate, it is unclear whether these initiatives will have the intended effect, or, even if successful, represent the most effective means for producing such change. In order to address this question, we compared the efficacy of two different ...