Input interpretation
![prevalence calculation](../image_source/b0211866195159ef8242dfea8a1c3919.png)
prevalence calculation
Equation
![prev = (tp + fn)/(tp + fp + tn + fn) | prev | prevalence tp | true positives fp | false positives tn | true negatives fn | false negatives](../image_source/6b8e6da4bfb4b509d104ae265de65248.png)
prev = (tp + fn)/(tp + fp + tn + fn) | prev | prevalence tp | true positives fp | false positives tn | true negatives fn | false negatives
Input values
![true positives | 22 false positives | 3 true negatives | 18 false negatives | 2](../image_source/5c7775eb8e07afa4c4f0b014c98be72d.png)
true positives | 22 false positives | 3 true negatives | 18 false negatives | 2
Results
![prevalence | 0.5333](../image_source/e6e23df447878a73f4f6dbd525be0374.png)
prevalence | 0.5333
Possible intermediate steps
![Calculate the prevalence using the following information: known variables | | tp | true positives | 22 fp | false positives | 3 tn | true negatives | 18 fn | false negatives | 2 The relevant equation that relates prevalence (prev), true positives (tp), false positives (fp), true negatives (tn), and false negatives (fn) is: prev = (tp + fn)/(tp + fp + tn + fn) Substitute known variables into the equation: known variables | | tp | true positives | 22 fp | false positives | 3 tn | true negatives | 18 fn | false negatives | 2 | : prev = (22 + 2)/(22 + 3 + 18 + 2) Evaluate (22 + 2)/(22 + 3 + 18 + 2): Answer: | | prev = 0.5333](../image_source/48aa62f27ccce03e2e6285e4f4a27e3e.png)
Calculate the prevalence using the following information: known variables | | tp | true positives | 22 fp | false positives | 3 tn | true negatives | 18 fn | false negatives | 2 The relevant equation that relates prevalence (prev), true positives (tp), false positives (fp), true negatives (tn), and false negatives (fn) is: prev = (tp + fn)/(tp + fp + tn + fn) Substitute known variables into the equation: known variables | | tp | true positives | 22 fp | false positives | 3 tn | true negatives | 18 fn | false negatives | 2 | : prev = (22 + 2)/(22 + 3 + 18 + 2) Evaluate (22 + 2)/(22 + 3 + 18 + 2): Answer: | | prev = 0.5333