The 2×2 Table

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The master layout. Disease across top (present/absent), Test result down side (positive/negative). TP, FP, FN, TN cells. EVERYTHING (sens, spec, PPV, NPV, LR, RR, OR) comes from this grid. How to populate it from a vignette. TwoByTwoCalculator. Mnemonic for cell positions. This is the backbone page for the screening section.

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