To calculate the overall accuracy you add the number of correctly classified sites and divide it by the total number of reference site. We could also express this as an error percentage, which would be the complement of accuracy: error + accuracy = 100%.

How do you calculate accuracy example?

Accuracy: Of the 100 cases that have been tested, the test could determine 25 patients and 50 healthy cases correctly. Therefore, the accuracy of the test is equal to 75 divided by 100 or 75%. Sensitivity: From the 50 patients, the test has only diagnosed 25. Therefore, its sensitivity is 25 divided by 50 or 50%.

How do you calculate percent accuracy?

You do this on a per measurement basis by subtracting the observed value from the accepted one (or vice versa), dividing that number by the accepted value and multiplying the quotient by 100.