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.
Usage
NPV(sens, spec, prev)
Arguments
sens
the sensitivity of the test
spec
the specificity of the test
prev
the prevalence of the disease
Value
the negative predictive value
References
van Hulst, R. 2018. Evaluating Scientific Evidence. ms.