Results
Control conversion rate
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Variant conversion rate
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Statistical significance
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P-value
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Relative lift
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Absolute lift
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How this works
This calculator uses a two-proportion z-test to determine whether the difference between your variant and control conversion rates is statistically significant.
z = (p₂ - p₁) / √[p̂(1-p̂)(1/n₁ + 1/n₂)]
Where:
- p₁ is the control conversion rate
- p₂ is the variant conversion rate
- p̂ is the pooled proportion: (x₁ + x₂) / (n₁ + n₂)
- n₁, n₂ are the sample sizes for control and variant
The p-value represents the probability of observing a difference at least as extreme as what you got, assuming there's no real difference between the variants. A p-value below your significance threshold (e.g., 0.05 for 95% significance) indicates a statistically significant result.