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sci.Bayes-theorem-test Calculator
Calculates positive predictive value PPV and negative predictive value NPV from sensitivity, specificity, and disease prevalence using Bayes' theorem. A test with 99% sensitivity and 99% specificity still has PPV < 50% when disease prevalence is 0.1% — false positives dominate low-prevalence screening.
Inputs
Prior Pct
Reference formula or conversion factor shown for context.
Sensitivity Pct
Reference formula or conversion factor shown for context.
Specificity Pct
Reference formula or conversion factor shown for context.