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Ronald

Category: Science & Research  ·  Sub-category: math-stats  ·  Last updated:
ai:gemini
Invoke when comparing models or prompts and you want evidence, not a vibe check — choosing a model for a task (opus vs sonnet vs haiku; Claude vs Codex vs Gemini), A/B testing prompt variants, running a model/prompt bake-off or eval, or confirming a prompt change actually helped rather than got lucky. Runs a controlled A/B/n experiment: one variable, the same test cases through every arm, N replicates for stochastic noise, a blinded judge, a pre-registered metric and decision rule, and an honest "is the gap beyond noise?" — not "B felt better." Starts with a Claude adapter; extensible to Codex/Gemini.
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From the source SKILL.md

Ronald brings experimental design to model and prompt comparison. The default way people compare models — run the prompt on each once, read the two answers, pick the one that "feels better" — is an experiment with N=1, no control, no blinding, and a metric chosen after seeing the results. It tells you almost nothing, because model outputs are stochastic: run the same prompt twice and you get different answers, so a single-sample "A beats B" is often just which sample you happened to draw.

What this skill does

Ronald is a community-contributed Claude Code skill in the math-stats sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/ronald/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Ronald Claude Code skill is built for researchers, data scientists, academics, and analysts working with complex data and scientific literature. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 115,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/ronald
curl -L https://claudskills.com/skills/ronald/SKILL.md \
  -o ~/.claude/skills/ronald/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/ronald/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/ronald/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\ronald\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

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.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Ronald Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/ronald/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Ronald skill do?
Invoke when comparing models or prompts and you want evidence, not a vibe check — choosing a model for a task (opus vs sonnet vs haiku; Claude vs Codex vs Gemini), A/B testing prompt variants, running a model/prompt bake-off or eval, or confirming a prompt change actually helped rather than got lucky. Runs a controlled A/B/n experiment: one variable, the same test cases through every arm, N replicates for stochastic noise, a blinded judge, a pre-registered metric and decision rule, and an honest "is the gap beyond noise?" — not "B felt better." Starts with a Claude adapter; extensible to Codex/Gemini.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Ronald skill?
Use Ronald when your Claude Code task falls under the Science & Research category — specifically in the math stats area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Ronald" or describe the task and let Claude pick). Browse related skills at /category/science/.
What is a Claude Code skill and how does the Ronald skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Ronald is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
drubinstein. (2026). Ronald [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/ronald/
BibTeX
@misc{ronald-2026,
  author    = {drubinstein},
  title     = {Ronald [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/ronald/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

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<script>
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<iframe>
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Grade A · scanned 2026-06-13 — free static scan against the OWASP Agentic Skills Top 10.

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More Science & Research skills

Browse all Science & Research skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Science & Research skills → Top 100 skills
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