Data Definitions & Appendices
Longitudinal-Household Employment Data:
The Longitudinal Employer-Household Dynamics (LEHD) program is part of the Center for Economic Studies at the U.S. Census Bureau. The LEHD program produces new, cost effective, public-use information combining federal, state and Census Bureau data on employers and employees under the Local Employment Dynamics (LED) Partnership. State and local authorities increasingly need detailed local information about their economies to make informed decisions. The LED Partnership works to fill critical data gaps and provide indicators needed by state and local authorities.
Bus Rapid Transit:
BRT systems are often confused with other bus services, but are indeed distinct entities. We define BRT systems in this research as unique bus systems which are branded and distinguished from all other forms of transit; have stops, stations, terminals, and corridors that clearly define the BRT operating area; use a variety of rights-of-ways; uses pre-board fare collection; provides information and communication technologies to improve rider experience both at the platform and on the bus; And, substantial service during the day, no less than 16 hours per day with peak 94 frequencies of no more than 10 minutes.
We use the Department of Housing and Urban Development Location Affordability Index (LAI) database which estimates the share of household budgets consumed by transportation. Fortunately, HUD’s Location Affordability Index (LAI) includes a block group-level data of all metropolitan counties in the U.S. Among the several household types for which estimates are made, we use figures for the “regional typical” household.
We used the North American Industry Classification System (NAICS) in our research to differentiate sectors from industries. NAICS is used by business and government in the U.S., Canada, and Mexico to classify business establishments according to type of economic activity (process of production). NAICS uses a six-digit code to get the most detailed information about a given industry level. In our research, we look at the two-digit and three-digit levels. The first two digits indicate economic sector (e.g., Accommodation and Food Services.) and the 3-digit indicates industry subsector (e.g., Food Services and Drinking Places).