Frequently Asked Questions
What is McNemar's test?
A chi-square test for paired binary data, checking whether the marginal frequencies of two related outcomes differ.
Why ignore concordant cells?
They contribute no information about change. The test focuses on cases where the two paired observations disagree (b and c).
When should I use continuity correction?
When b + c is small (< 25 or so). It nudges the test toward the exact binomial result and avoids inflated chi-square values.
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