Huolala Tech

Dec 29, 2023 · Fundamentals

How Variance Reduction Boosts A/B Test Sensitivity Without More Samples

This article explains why variance reduction is essential for A/B experiments, describes at‑assignment and post‑assignment techniques such as stratified sampling, post‑stratification and CUPED, compares their effectiveness, and presents real‑world case studies demonstrating how they improve experiment sensitivity without increasing sample size.