Fisher exact independent table test
Test a fixed-margin 2×2 table using a probability-ordered two-sided tail.
Your entries stay in this page’s memory and are not submitted to us. Downloads are generated locally. Reloading or leaving the page clears your entries. Do not enter patient information.
Rows represent independent groups and columns the same two outcomes. Counts are nonnegative integers, every margin positive and grand total at most 2,000.
The starting values are hypothetical. Results update as you edit. Use aggregate or synthetic inputs only.
Calculation results
- Two-sided exact p
- 0.0027594562
- Sample odds ratio
- 0.03030303
How to interpret the output
The two-sided p-value sums tables whose hypergeometric probability is no larger than the observed table, within a floating-point tolerance. The displayed cross-product odds ratio is a descriptive sample estimate; no conditional odds-ratio interval is supplied. This is not a paired-data test.
Method referenceSource checked 2026-11-06. Read the reproducible calculator validation report.