Effect Size is a production-ready Claude Code skill (quality score 70/100) in the math-stats sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/effect-size/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when: (1) Reporting research results to show practical significance, (2) Meta-analysis to combine study results, (3) Grant writing to justify expected effects, (4) Interpreting published studies beyond p-values, (5) Sample size planning for power analysis.
The Effect Size skill is built for researchers, data scientists, academics, and analysts working with complex data and scientific literature. It is part of the open ClaudSkills registry, a community-curated catalog of 15,000+ capabilities you can install for Claude Code — the Claude CLI agent.
mkdir -p ~/.claude/skills/effect-size curl -L https://claudskills.com/skills/effect-size/SKILL.md \ -o ~/.claude/skills/effect-size/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/effect-size/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/effect-size/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\effect-size\SKILL.md on Windows. See the full install guide for step-by-step instructions.
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
Browse all Science & Research skills in the ClaudSkills registry, or explore these top-rated picks from the same category:
Part of Acreator Store — Adam Lankamer's AI tools: GifPerfect · AspectPerfect · SlomoPerfect · Ucaption · UTagger · AutoXPoster · TestYourSkills