Fisher Exact Test Calculator
Calculate Fisher exact test for 2x2 contingency tables.
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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