Sensitivity: The ability of finding people with disease who have a positive test result.
Sensitivity = true positives / (true positives + false negatives)
Specificity: The ability of finding people free of a disease who have a negative test.
Specificity = true negatives / (true negatives + false positives)
Positive Predictive Value (PPV): The percentage of people with a positive test result who actually have the disease.
Positive predictive value = true positives / (true positives + false positives) see figure
Negative Predictive Value (NPV): The percentage of people with a negative test who do NOT have the disease.
Negative predictive value = true negatives / (true negatives + false negatives)
Thanks that is an excellent summary
ReplyDeleteWhat does the dark pink area between FP and TP represent ?
ReplyDeleteIt is FP. both the light and dark pink areas represent false positives.
ReplyDelete