Design experiments and quasi-experiments before analysis. Use when choosing study design, treatment/control structure, outcomes, assumptions, validation plans after scientific experiment failure, or which of DiD, ITS, synthetic control, or regression discontinuity fits the research question. For fitting models or estimating effects on existing data, use performing-causal-analysis instead.
Install
npx skills add foryourhealth111-pixel/Vibe-Skills --skill designing-experimentsnpx skills add foryourhealth111-pixel/Vibe-Skills --skill designing-experiments -a claude-code -gnpx skills add foryourhealth111-pixel/Vibe-Skills --skill designing-experiments -a codex -ggemini skills install https://github.com/foryourhealth111-pixel/Vibe-Skills.git --path bundled/skills/designing-experimentsgh skill install foryourhealth111-pixel/Vibe-Skills designing-experimentsgit clone --depth 1 https://github.com/foryourhealth111-pixel/Vibe-Skills /tmp/foryourhealth111-pixel__Vibe-Skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/foryourhealth111-pixel__Vibe-Skills/bundled/skills/designing-experiments ~/.claude/skills/designing-experiments # Claude Code
cp -R /tmp/foryourhealth111-pixel__Vibe-Skills/bundled/skills/designing-experiments ~/.agents/skills/designing-experiments # Codex, Cursor, Gemini CLI, Copilot, OpenCode