What does the Rhiannon skill do?

Measure marketing honestly: build the MMM, calibrate it against experiments, and reallocate budget on marginal return. Load it once into Claude Projects and you get a configured Marketing Mix Modeling & Incrementality Analyst without re-explaining context at the start of every session. Check every number against a known-good source and an honest holdout before anyone builds a decision on it, and state the uncertainty instead of shipping a single confident point estimate.

How do I install this skill file?

Download the .skill package (it contains SKILL.md), paste the contents into Claude Projects Instructions or your AI's system prompt, add your own context and start your first session. Works with Claude, ChatGPT, or any AI chat that accepts system prompts.

Which AI tools does this skill work with?

Works with Claude (recommended), ChatGPT, Gemini, Perplexity and Copilot, and any AI chat that accepts system prompts. Claude Projects gives the best results.

What is included in this download?

One .skill package delivered instantly after purchase: the full SKILL.md role configuration plus a worked-example file with a real scenario so you see the quality before you rely on it. No subscription, yours permanently.

How is this different from using Claude without the Rhiannon skill?

Without a skill file your AI starts every session as a general assistant. With Rhiannon loaded it applies Marketing Mix Modeling & Incrementality Analyst methodology from the first message, with consistent quality every time. Check every number against a known-good source and an honest holdout before anyone builds a decision on it, and state the uncertainty instead of shipping a single confident point estimate.

Marketing Mix Modeling & Incrementality AI Skill for Claude & ChatGPT

Name: Rhiannon — Marketing Mix Modeling & Incrementality Analyst AI Skill
Brand: KissMySkills
Price: 14.99 USD
Availability: InStock

Rhiannon — Marketing Mix Modeling & Incrementality Analyst AI Skill

$14.99

Rhiannon — Marketing Mix Modeling & Incrementality Analyst AI Skill

$14.99 this skill vs $155+/hr, hiring one

⚡ Instant download ◆ Claude & ChatGPT ∞ Keep forever

Instant download · 30-day money-back guarantee. Pay once, keep forever — no subscription. Refund policy

Measure marketing honestly: build the MMM, calibrate it against experiments, and reallocate budget on marginal return.

Adstock, saturation curves and baseline decomposition
Geo experiments, holdouts and conversion-lift incrementality
Calibrating MMM against experiments, not against attribution
Budget allocation on marginal ROI with stated uncertainty

Marketing leaders whose platform-reported ROAS does not survive contact with an actual holdout test.A marketing measurement consultant bills $155+/hr, this is one file, yours forever.

// what's inside

Drop Rhiannon into Claude and get a measurement analyst who triangulates the model against a real experiment before letting anyone reallocate a budget.

Rhiannon measures what marketing actually caused: marketing mix modeling with adstock and carryover, saturation and diminishing-returns curves, seasonality and baseline decomposition, cross-channel multicollinearity and Bayesian MMM with defensible priors; geo experiments and matched-market tests; incrementality testing through holdouts, PSA tests, ghost ads and conversion lift; attribution and why last-click and multi-touch break under privacy loss; triangulating MMM with experiments and attribution instead of trusting any one of them; budget allocation by marginal return rather than blended ROAS; MMM validation through holdout accuracy, calibration against experiments and coefficient plausibility; and communicating uncertainty to a CMO who wants one number.

What you get

→Adstock, saturation curves and baseline decomposition
→Geo experiments, holdouts and conversion-lift incrementality
→Calibrating MMM against experiments, not against attribution
→Budget allocation on marginal ROI with stated uncertainty

📄 rhiannon-marketing-mix-modeling-analyst.skill Under 2 min install Works with Claude, ChatGPT & any AI chat

How to install

Download the .skill package → open Claude → paste SKILL.md into your Project Instructions or system prompt → describe your requirement → Rhiannon builds the answer. Includes a full worked example so you see exactly what you get.

rhiannon-marketing-mix-modeling-analyst.skill

# Rhiannon - Marketing Mix Modeling & Incrementality Analyst

You are Rhiannon, a marketing measurement analyst. A model that has never been calibrated against an experiment is an opinion with math on it.

## How you work
1. Decompose baseline from incremental before crediting any channel
2. Fit adstock and saturation per channel, not one global assumption
3. Calibrate the model against a properly powered geo or holdout test
4. Reallocate on marginal return; state uncertainty as a range

Never present a point estimate as certainty, and never let platform-reported ROAS stand in for incrementality.

Excerpt from the actual file you'll download.

// try it

prompt

$Meta says 6x ROAS. Finance does not believe it. Tell me what our channels are really worth.

Rhiannon returns an MMM with adstock and saturation fitted per channel, the platform-reported figure restated against the modelled contribution, a geo experiment design powered properly to validate it, a triangulation table across MMM, experiments and attribution, a marginal-return budget reallocation, and the uncertainty stated as a range rather than a single number.

// how to install Under 2 minutes

Four steps. Any AI chat.

01
Download the file
After checkout, the download link lands in your inbox. Save the file anywhere on your device.
02
Open your AI chat
Claude, ChatGPT, Gemini, Grok, or Copilot — whichever one you already use.
03
Paste the file contents
Drop it into the system prompt, Project instructions, or custom instructions field.
04
Start working
Your AI is now configured as a specialist. Ask it anything inside its domain.