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A/B testing & experimentation

User bucketing, experiment metrics, statistical comparison, and rollout guardrails.

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How to Run a Fisher Exact Test in Python

Compute the two-sided Fisher exact test p-value for a 2x2 contingency table using pure Python and the math module.

statistics fisher-exact ab-testing
Python 
from math import comb, factorial
from itertools import combinations


def hypergeometric_probability(a, b, c, d):
    """Probability of observing table [[a, b], [c, d]] under the null."""
    row1 = a + b
    row2 = c + d
    col1 = a + c
    col2 = b + d
    total = row1 + row2
    return (comb(row1, a) * comb(row2, …
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