McNemar Paired Binary Test Calculator

How to use McNemar Paired Binary Test Calculator

Only discordant before/after counts b,c determine McNemar inference. Exact mode doubles the smaller Binomial(b+c,.5) tail, capped at1; corrected chi-square uses max(|b−c|−1,0)²/(b+c).

1. Enter before yes / after yes, before yes / after no, before no / after yes, before no / after no.
2. Choose the stated convention and check the units and supported model.
3. Calculate, inspect the result, then copy or download it.

Good to know

• Whole paired counts, at most1000discordant pairs. Corrected chi-square p is withheld below25discordant pairs; no discordance gives a no-information state. Not an independent A/B test.
• Runs locally. Text/JSON fields are capped at30,000 characters; stricter page-specific and numeric-string limits also apply. Numeric inputs are bounded to magnitude1e15 and nonzero magnitude at least1e-100 unless an exact-string mode states otherwise. Approximate summaries use12 significant digits; CSV numeric cells retain the complete stored value and potentially formula-like string cells gain a protective apostrophe; unsupported, non-finite or detected underflow states return an error.