Skip to content
cccskills
FreePublished on GitHub

experiment-designer

Plan and evaluate product A/B tests with clear hypotheses, success metrics, sample size estimates, and stopping rules. Rank proposed experiments and interpret results using effect sizes and uncertainty to support practical product decisions.

OriginalShow the original description

Use when planning product experiments, writing testable hypotheses, estimating sample size, prioritizing tests, or interpreting A/B outcomes with practical statistical rigor.

See how to install

Good for

  • Turn a product improvement idea into a testable hypothesis
  • Estimate the sample size needed for an A/B test
  • Rank experiments by impact, confidence, and ease
  • Interpret test results alongside business impact

Files included (4)

  • SKILL.md3.1 KB
  • references/experiment-playbook.md1.9 KB
  • references/statistics-reference.md1.5 KB
  • scripts/sample_size_calculator.py3.0 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Experiment Designer

Design, prioritize, and evaluate product experiments with clear hypotheses and defensible decisions.

When To Use

Use this skill for:

  • A/B and multivariate experiment planning
  • Hypothesis writing and success criteria definition
  • Sample size and minimum detectable effect planning
  • Experiment prioritization with ICE scoring
  • Reading statistical output for product decisions

Core Workflow

  1. Write hypothesis in If/Then/Because format
  • If we change [intervention]
  • Then [metric] will change by [expected direction/magnitude]
  • Because [behavioral mechanism]
  1. Define metrics before running test
  • Primary metric: single decision metric
  • Guardrail metrics: quality/risk protection
  • Secondary metrics: diagnostics only
  1. Estimate sample size
  • Baseline conversion or baseline mean
  • Minimum detectable effect (MDE)
  • Significance level (alpha) and power

Use:

python3 scripts/sample_size_calculator.py --baseline-rate 0.12 --mde 0.02 --mde-type absolute
  1. Prioritize experiments with ICE
  • Impact: potential upside
  • Confidence: evidence quality
  • Ease: cost/speed/complexity

ICE Score = (Impact * Confidence * Ease) / 10

  1. Launch with stopping rules
  • Decide fixed sample size or fixed duration in advance
  • Avoid repeated peeking without proper method
  • Monitor guardrails continuously
  1. Interpret results
  • Statistical significance is not business significance
  • Compare point estimate + confidence interval to decision threshold
  • Investigate novelty effects and segment heterogeneity

Hypothesis Quality Checklist

  • Contains explicit intervention and audience
  • Specifies measurable metric change
  • States plausible causal reason
  • Includes expected minimum effect
  • Defines failure condition

Common Experiment Pitfalls

  • Underpowered tests leading to false negatives
  • Running too many simultaneous changes without isolation
  • Changing targeting or implementation mid-test
  • Stopping early on random spikes
  • Ignoring sample ratio mismatch and instrumentation drift
  • Declaring success from p-value without effect-size context

Statistical Interpretation Guardrails

  • p-value < alpha indicates evidence against null, not guaranteed truth.
  • Confidence interval crossing zero/no-effect means uncertain directional claim.
  • Wide intervals imply low precision even when significant.
  • Use practical significance thresholds tied to business impact.

See:

  • references/experiment-playbook.md
  • references/statistics-reference.md

Tooling

scripts/sample_size_calculator.py

Computes required sample size (per variant and total) from:

  • baseline rate
  • MDE (absolute or relative)
  • significance level (alpha)
  • statistical power

Example:

python3 scripts/sample_size_calculator.py \
  --baseline-rate 0.10 \
  --mde 0.015 \
  --mde-type absolute \
  --alpha 0.05 \
  --power 0.8

Reviews

No reviews yet. Tell others what you thought.

Comments

No login needed. Share how it worked for you, ask a question, or note where it did not run.

No comments yet. Be the first to write one.

Comments are published right away. Do not include personal information such as email addresses or phone numbers. Up to 2 URLs.

0 / 1,000 characters

This form is protected by reCAPTCHA, and the Google Privacy Policy and Terms of Service apply.

More skills from this repository

a11y-audit

FreeSummary

Audit web applications for accessibility issues against WCAG 2.2 Level A and AA, the web accessibility standards. Get framework-specific code fixes, contrast checks, verification steps, and reports, with options for automated checks in development pipelines.

  • Audit a web application before release
  • Fix contrast and keyboard navigation issues
  • Prepare accessibility reports for stakeholders
alirezarezvani/claude-skills28.5KUpdated Oct 21, 2026

ab-test-setup

FreeSummary

Plan A/B tests that compare page variations, from headlines to pricing layouts. Define a hypothesis, choose success metrics, calculate sample size and duration, and prepare launch checks and results reports to support decisions.

  • Comparing landing page headlines
  • Testing signup button changes
  • Planning pricing page experiments
alirezarezvani/claude-skills28.5KUpdated Oct 21, 2026

ad-creative

FreeSummary

Create paid ad headlines and body copy tailored to each platform's character limits. Use existing performance data to develop variations, explore new messaging angles, and check copy for length, quality, and potential rejection risks.

  • Creating Google RSA headlines
  • Writing Meta and LinkedIn ad copy
  • Developing variations of successful ads
alirezarezvani/claude-skills28.5KUpdated Oct 21, 2026

Review code changes from three critical perspectives: production failures, maintainability, and security. Get a consolidated report that ranks findings by severity and provides merge guidance, helping examine assumptions that an ordinary self-review may overlook.

  • Reviewing a pull request before merging
  • Getting a second opinion on AI-written code
  • Checking authentication or data access code
alirezarezvani/claude-skills28.5KUpdated Oct 21, 2026

aeo

FreeSummary

Audit and improve content intended for citation in AI answers. Review evidence, author information, and structure, generate revised content and structured metadata, and keep a local record of observed citations across AI services.

  • Audit existing articles for evidence and credibility gaps
  • Revise article structure and references for AI answers
  • Record citations observed across AI services
alirezarezvani/claude-skills28.5KUpdated Oct 21, 2026

Create signed records for consequential agent actions such as deployments, deletions, and payments. Decide which actions need evidence, record the agent, action, target, and policy, then verify the resulting certificate offline to detect later changes.

  • Creating signed records for production deployments
  • Preserving evidence of deletions and payments
  • Recording access grants for later review
alirezarezvani/claude-skills28.5KUpdated Oct 21, 2026

See all skills by alirezarezvani

Report a problem with this skill