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Sensitivity, Specificity, and Incidence

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sensitivity & specificity controller
incidence
radix
sensitivity
specificity
incidence
approximate incidence
radix
9
10
9
10
0.01
1
100
300
actually positive
actually negative
test is positive
3
30
test is negative
0
267
Testing, whether done in the medical field or elsewhere, generally has what is known as sensitivity and specificity. Sensitivity is the fraction of tested subjects who truly have somecharacteristic that the test will say they have. Specificity is the fraction of tested subjects who truly do not have some characteristic that the test will say they do not have. This Demonstration shows how the number of true positives, false positives, false negatives, and true negatives can be calculated by using data regarding sensitivity, specificity, and the incidence in the tested population of a particular characteristic.
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