---
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]]