Fisher精确检验计算器
执行Fisher精确检验，分析2×2列联表中两个分类变量的关联性，适用于小样本数据的独立性检验。
Odds Ratio
9.3333
Total N20
Row 1 Total10
Row 2 Total10
Odds Ratio vs Cell a (R1,C1)
公式
Fisher Exact Test
Computes exact probability for 2x2 tables. Preferred over chi-square for small samples.
计算示例
2x2: a=8, b=2, c=3, d=7.
- 01OR = 56/6 = 9.33
- 02N=20
常见问题
When vs chi-square?
When any expected count < 5 or N < 20.
Odds ratio?
OR > 1 means event more likely in group 1.
Beyond 2x2?
Use Freeman-Halton extension.
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