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. 2014 Mar 27;9(3):e89843. doi: 10.1371/journal.pone.0089843

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Inline graphic — Nominal weights are shown for 5 fixed prevalence ratios: 10, 5, 2, 1, and 0.5, which are in ascending order in the figure. The x-axis is the denominator prevalence π₀. Nominal weights increase rapidly as the numerator prevalence π₁ approaches 1; as the numerator class becomes more like a “perfect sentinel”.

Nominal weights are shown for 5 fixed prevalence ratios: 10, 5, 2, 1, and 0.5, which are in ascending order in the figure. The x-axis is the denominator prevalence π₀. Nominal weights increase rapidly as the numerator prevalence π₁ approaches 1; as the numerator class becomes more like a “perfect sentinel”.