# McFatties

> Interactive data explorer of U.S. county-level adult obesity prevalence (CDC PLACES) vs. McDonald's location density per 100,000 residents. Correlation, not causation. Published by AXIA Enterprises.

## Main Pages
- [Home](https://mcfatties.com/): Single-page explorer with choropleth map, linked scatterplot, rankings tables, insights, and methodology.
- [AI Info](https://mcfatties.com/llm-info.html): Machine-readable site description and instructions for AI assistants.

## Page Sections
- [Map](https://mcfatties.com/#map): County choropleth of obesity prevalence, McDonald's per 100k, or deviation from the national obesity average, with state and population filters.
- [Correlation](https://mcfatties.com/#correlation): Scatterplot of McDonald's per 100k vs. obesity with Pearson correlation and OLS trendline.
- [Rankings](https://mcfatties.com/#rankings): Top counties by McDonald's density, by obesity, and mismatch tables in both directions.
- [Methodology](https://mcfatties.com/#methodology): Data sources, spatial-join processing, normalization, and limitations.

## Data Sources
- [CDC PLACES](https://www.cdc.gov/places/index.html): County adult obesity prevalence (OBESITY measure) and population.
- [gavinr/usa-mcdonalds-locations](https://github.com/gavinr/usa-mcdonalds-locations): McDonald's location points.
- [topojson/us-atlas](https://github.com/topojson/us-atlas): U.S. county boundaries.