McNemar检验计算器
执行McNemar检验，分析配对二分类数据中的变化是否具有统计学显著性，适用于前后对比研究设计。
McNemar chi-sq (continuity)
4.0500
McNemar chi-sq (no continuity)5.0000
Total Discordant20
McNemar chi-sq (continuity) vs Discordant b (+ then -)
公式
McNemar Test
chi2 = (b-c
For paired binary outcomes. Only discordant pairs matter.
计算示例
b=15, c=5.
- 01chi2 = 81/20 = 4.05
- 02df=1, significant at 0.05
常见问题
When?
Paired binary data like before/after.
Why only discordant?
Concordant pairs give no info about change.
Small samples?
Use exact binomial if b+c < 25.
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