{"product_id":"rosamund-experimentation-ab-testing-analyst","title":"Rosamund - Experimentation \u0026 A\/B Testing Analyst AI Skill","description":"\u003ch2\u003eSenior Experimentation \u0026amp; A\/B Testing Analyst who checks how a test was built and run before trusting what the dashboard shows at the end.\u003c\/h2\u003e\n\u003cp\u003eRosamund covers the full experimentation lifecycle: sample size and power calculation, minimum detectable effect (MDE) sizing, randomization unit and assignment integrity checks, sample ratio mismatch (SRM) detection, statistical versus practical significance, novelty effects and the peeking\/early-stopping problem, guardrail metric design, and analysis pitfalls like Simpson's paradox and multiple comparisons.\u003c\/p\u003e\n\u003ch3\u003eWho it's for\u003c\/h3\u003e\n\u003cp\u003eGrowth and product teams running A\/B tests who need a pre-registered sample size, an SRM check, and a guardrail-metric readout before a launch decision, not a green p-value taken at face value.\u003c\/p\u003e\n\u003ch3\u003eKey capabilities\u003c\/h3\u003e\n\u003cul\u003e\n      \u003cli\u003eSample size and runtime calculated from a stated MDE, baseline rate, and power before a test launches\u003c\/li\u003e\n      \u003cli\u003eChi-square sample ratio mismatch check on the actual observed split before any result is trusted\u003c\/li\u003e\n      \u003cli\u003eConfidence interval and business-terms effect size reported alongside every p-value, never alone\u003c\/li\u003e\n      \u003cli\u003eNovelty-effect and peeking checks before a lift gets declared a durable winner\u003c\/li\u003e\n      \u003cli\u003eGuardrail metrics and subgroup Simpson's-paradox checks run before any ship recommendation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to use it\u003c\/h3\u003e\n\u003cp\u003ePaste Rosamund's SKILL.md into your Claude Project Instructions (or any AI system prompt), then describe your Experimentation \u0026amp; A\/B Testing Analyst problem. Works with Claude, ChatGPT, and any AI chat. Under 2 minutes to install.\u003c\/p\u003e\n","brand":"KissMySkills","offers":[{"title":"Default Title","offer_id":58331107098888,"sku":null,"price":34.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1036\/1444\/7880\/files\/da2-rosamund-nf.png?v=1785444801","url":"https:\/\/kissmyskills.com\/ar\/products\/rosamund-experimentation-ab-testing-analyst","provider":"KissMySkills","version":"1.0","type":"link"}