Diagnostic test evaluation and comparison
Positive and Negative Predictive Values for a test
Use this to calculate the positive and negative predictive values for a test of known sensitivity and specificity for a range of prior probabilities of infection.
- - Test unit sensitivity;
- - Test unit specificity; and
- - Prior probability of infection.
- - Positive (PPV) and negative (NPV) predictive values for given inputs; and
- - Table and plot of PPV and NPV for given sensitivity and specificity values and varying prior probability of infection.