Screening and PPV: a good test for a rare condition

Prevalence

One in 1,000. Logarithmic slider.

Sensitivity

Of the people who have it, the share the test catches.

Specificity

Of the people who do not have it, the share the test clears.

People drawn

Display

Icon array

true positive false positive false negative true negative

PPV-

NPV-

False positives-

True positives-

LR+-