Input interpretation
prevalence calculation
Equation
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
Results
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