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wiki/concepts/Power-Analysis.md

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+---
+title: "Power Analysis"
+type: concept
+tags: [statistics, experimentation]
+sources: [project-management-experiment-tracker]
+last_updated: 2026-04-20
+---
+
+## Definition
+Power Analysis estimates the sample size needed to detect a meaningful effect with a desired probability of success.
+
+## Core Principles
+- Specify minimum detectable effect
+- Choose desired power level before launch
+- Use realistic baseline rates and variance estimates
+- Recompute when the experiment design changes
+
+## Related Concepts
+- [[Hypothesis Testing]]
+- [[Statistical Significance]]
+- [[A/B Testing]]
+
+## Related Entities
+- [[Experiment Tracker]]
+