U.S. Census Bureau. (2018). Economy Wide Statistics Division, County Business Patterns (2013-2016). Accessed July 18th, 2018.
Definition:
Retail Food Environment Index (RFEI) is the ratio of convenience stores (excluding gas stations convenience stores), limited-service restaurants (aka fast food restaurants), and full-service restaurants TO supermarkets and specialty food stores
Numerator: U.S. Department of Health and Human Services. Health Resources and Services Administration (HRSA). Area Health Resources File (AHRF), 2017-2018 Release. https://datawarehouse.hrsa.gov/data/datadownload.aspx