stat-ab-testing
A/B Testing Statistics
Framework
IRON LAW: Calculate Sample Size BEFORE Running the Test
Running a test without knowing the required sample size leads to two
failures: stopping too early (false positives) or running too long (waste).
Required inputs: baseline conversion rate, minimum detectable effect (MDE),
significance level (α), power (1-β). Calculate BEFORE starting.
Sample Size Formula (Proportions)
n per group ≈ (Z_α/2 + Z_β)² × [p₁(1-p₁) + p₂(1-p₂)] / (p₁ - p₂)²
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