Predictive values: 10 worked exercises
2×2 tables · Bayes · likelihood ratios · the case–control trap
Ten problems on PPV and NPV, from a first 2×2 table to the traps that catch clinicians: reading a table backwards, the same test in two clinics, working back to a prevalence, the NPV illusion, and why screening runs in two stages. Each states the problem, then folds the full solution away.