Enter the true negative rate and the false negative rate into the calculator to determine the negative predicted value.
Negative Predictive Value Formula
The following formula is used to calculate a negative predictive value.
NPV = TNR / (TNR + FNR)
- Where NPV is the negative predictive value
- TNR is the true negative rate
- FNR is the false negative rate
Negative Predictive Value Definition
A negative predictive value is defined as the probability that a negative result will be a false negative.
Negative Predictive Value Example
How to calculate negative predictive value?
- First determine the true negative rate.
Calculate the rate at which a true negative test results is found.
- Next, determine the false negative rate.
Calculate the rate at which a negative test results in a false negative.
- Finally, calculate the negative predictive value.
Using the formula, calculate the NPV.
A negative predictive value is the probability or chance that people who get a negative test result, actually do not have whatever was being tested for. In other words, it’s a measure of how accurate a given test is.
A positive predictive value is the probability that you actually have a disease given a positive test results.