NPV {evidence} | R Documentation |
The negative predictive value (NPV) of a diagnostic test is the probability that someone with a negative diagnostic test for a condition does not have the condition. The NPV can easily be calculated from the prevalence, the sensitivity, and the specificity, but this function automates the procedure.
NPV(sens, spec, prev)
sens |
the sensitivity of the test |
spec |
the specificity of the test |
prev |
the prevalence of the disease |
the negative predictive value
Robert van Hulst
van Hulst, R. 2018. Evaluating Scientific Evidence. ms.
NPV(0.9, 0.8, 0.003)