Finite population enrichment tail
Calculate an upper-tail probability for sampling without replacement.
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All inputs must be whole counts. Population is at most 10,000 and draws at most 1,000; observed count must be feasible under the margins.
The starting values are hypothetical. Results update as you edit. Use aggregate or synthetic inputs only.
Calculation results
- Expected marked draws
- 2
- Upper-tail probability
- 0.025464546
- Observed marked fraction
- 0.5
How to interpret the output
The upper tail P(X≥observed) conditions on fixed population membership and a simple random sample without replacement. It addresses enrichment, not two-sided association. Gene-set tests still need a defensible background universe and multiplicity control.
Method referenceSource checked 2026-11-06. Read the reproducible calculator validation report.