# Power Sample Size Calculator

> Statistical power analysis and sample size determination

- Skill: `a5c-ai/power-sample-size-calculator` (Agent Skill)
- Install (CLI): `npx skillmds@latest add a5c-ai/power-sample-size-calculator`
- Raw SKILL.md: https://api.skillmd.com/api/skills/a5c-ai/power-sample-size-calculator/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: a5c-ai (https://skillmd.com/u/a5c-ai)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/a5c-ai/power-sample-size-calculator

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# Power and Sample Size Calculator

## Purpose

Provides statistical power analysis and sample size determination capabilities for experimental design.

## Capabilities

- Power analysis for common tests (t-test, ANOVA, chi-square)
- Effect size calculation
- Sample size estimation
- Simulation-based power analysis
- Multi-level model power analysis
- Sequential analysis design

## Usage Guidelines

1. **Effect Size**: Specify meaningful effect sizes
2. **Power Target**: Set appropriate power levels (typically 0.80)
3. **Type I Error**: Control alpha appropriately
4. **Simulation**: Use simulation for complex designs

## Tools/Libraries

- G*Power
- pwr (R)
- statsmodels