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ab-test-analyzer SKILL.md skillA

ab-test-analyzer from irinabuht12-oss/marketing-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add irinabuht12-oss/marketing-skills/ab-test-analyzer@git:20261027.b3bdcd6

Pins git:20261027.b3bdcd6 in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: irinabuht12-oss/marketing-skills
Path: skills/ab-test-analyzer/SKILL.md
Versions recorded: 2
Latest version: git:20261027.b3bdcd6, committed Oct 27, 2026
First version recorded: Sep 8, 2026
Size: 5,688 bytes
Repository stars: 6,704
License: none declared

Statistical significance calculator for A/B test results with sample size requirements, segment breakdowns, and hypothesis generation. Use when feeding test results, checking statistical significance, calculating sample sizes, analyzing experiment outcomes, or generating next test ideas based on results. Platform: Google and Meta.

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

Evaluate A/B test results with statistical rigor and generate actionable next steps.

## Process

1. **Collect test data** - Variations, sample sizes, conversions, time period
2. **Check validity** - Runtime, sample size, peeking issues
3. **Calculate significance** - Z-score, p-value, confidence interval
4. **Segment analysis** - Device, source, new vs returning
5. **Interpret results** - Statistical vs practical significance
6. **Generate hypotheses** - "Why it worked" and next test ideas

## Sample Size Calculator

```
n = 2 × (Zα/2 + Zβ)² × p(1-p) / δ²

Where:
- n = sample size per variation
- Zα/2 = 1.96 (95% confidence) or 2.58 (99%)
- Zβ = 0.84 (80% power) or 1.28 (90%)
- p = baseline conversion rate
- δ = minimum detectable effect (absolute)
```

**Quick Reference (95% confidence, 80% power)**:
| Baseline CR | 10% Relative MDE | 20% Relative MDE |
|-------------|------------------|------------------|
| 2% | 78,000/var | 19,500/var |
| 5% | 30,000/var | 7,500/var |
| 10% | 14,300/var | 3,600/var |

## Significance Calculation

```
Z-score = (pB - pA) / √(SE²_A + SE²_B)
SE = √(p × (1-p) / n)

If |Z| > 1.96 → Significant at 95%
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add irinabuht12-oss/marketing-skills/ab-test-analyzer@sha256:1cabee0759c2e241

The line at the top of this page pins the label git:20261027.b3bdcd6, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_5wcvizoal76t7uso.svg)](https://markdownregistry.com/a/art_5wcvizoal76t7uso)

4 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 2 versions of this file, between Sep 8, 2026 and Oct 27, 2026, about one every 48 days.

version	committed	commit	size	audit
git:20261027.b3bdcd6 latest	2026-10-27	b3bdcd6	5,688 B	A	view · diff
git:20260908.cc021ba	2026-09-08	cc021ba	5,641 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (5688 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

GitHub

irinabuht12-oss/marketing-skills · 6,704 stars · license none declared · pushed 2026-10-27 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_5wcvizoal76t7uso
GET https://markdownregistry.com/api/v1/resolve?ref=irinabuht12-oss/marketing-skills/ab-test-analyzer
GET https://markdownregistry.com/api/v1/blob/1cabee0759c2e24143803f5e4a5dc9128b1364088fd0087a8a405c10490181e1

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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