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Sample Size calculator

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A/B Test Sample Size Calculator

Optimizely's sample size calculator is different from other statistical significance calculators. It is based on the formula used in Optimizely's Stats Engine. Stats Engine calculates statistical significance using sequential testing and false discovery rate controls. When combined, these two techniques mean you no longer need to wait for a pre-set sample size to ensure the validity of your results.

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A/B Test Sample Size Calculator