ab-test-analyzer SKILL.md skillA
ab-test-analyzer from skillmedev/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add skillmedev/skills/ab-test-analyzer@git:20261005.bea4ea5Pins git:20261005.bea4ea5 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- skillmedev/skills
- Path
skills/ab-test-analyzer/SKILL.md- Versions recorded
- 3
- Latest version
- git:20261005.bea4ea5, committed Oct 5, 2026
- First version recorded
- Jul 5, 2026
- Size
- 9,394 bytes
- Repository stars
- 19
- License
- MIT
Analyzes an A/B experiment to a defensible verdict - sample-size and minimum-detectable-effect math, two-proportion significance testing with confidence intervals, and checks for the traps that fake a win (peeking, sample ratio mismatch, multiple comparisons). Use when someone asks "is this test significant", "did variant B win", "how long should I run this experiment", "what sample size do I need", or shows experiment results and asks whether to ship. Do NOT use for logging and organizing ML…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# A/B Test Analyzer Read experiments like a skeptic: most "wins" are noise until proven otherwise. The costly mistake this skill prevents is shipping on a peeked, underpowered, or mis-split test - a false positive that ships is worse than no test, because the team now defends a change that does nothing. Every verdict here comes with the interval, the checks that passed, and the checks that did not. ## Operating procedure Order is mandatory: validity checks (Step 3) come before the significance math (Step 4), because a significant result on an invalid test is still invalid. ### Step 1: Gather inputs Collect before computing anything; label unknowns as guesses. 1. The single primary metric and its type (conversion rate, revenue per user, retention). 2. The hypothesis and the minimum effect that would matter to the business - the smallest lift worth the cost of shipping and maintaining the change. If the requester has no number, help set one; without it "significant" is uninterpretable. 3. Per-arm sample sizes and metric values (successes and trials for proportions). …
Read the whole file at its exact version.
How to install
mdr add skillmedev/skills/ab-test-analyzer@sha256:0578561f8f5b1a10The line at the top of this page pins the label git:20261005.bea4ea5, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_sswk47ipujtcundg)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jul 5, 2026 and Oct 5, 2026, about one every 46 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261005.bea4ea5 latest | 2026-10-05 | bea4ea5 | 9,394 B | A | view · diff |
| git:20260705.a28c4ce | 2026-07-05 | a28c4ce | 9,356 B | A | view · diff |
| git:20260705.acb5571 | 2026-07-05 | acb5571 | 9,386 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (9394 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
skillmedev/skills · 19 stars · license MIT · pushed 2026-10-13 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_sswk47ipujtcundg GET https://markdownregistry.com/api/v1/resolve?ref=skillmedev/skills/ab-test-analyzer GET https://markdownregistry.com/api/v1/blob/0578561f8f5b1a1084acbdda19f5cdab49af21bbd597ebd38caccb52900a3a3f
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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