sbscp_df: State border strip county assignments.
In davidsovich/usgeogr: An R package for U.S. geographic data.

Description Usage Format Source

A dataset that assigns each border county to a unique state border pair strip (e.g., AL-FL). For counties that reside along multiple state-border strips (e.g., AZ-NV, NV-UT), the county is assigned to the state-border strip to which its center of population is closest. If a county is closest to a state-border strip that it is not adjacent with, the next closest adjacent state-border strip is chosen. State-border pair strips are identified by state_border_id.

sbscp_df

A data frame with 1,184 rows and 3 variables:

fips_code: County FIPS code, in original string format. Unique identifier.
county_state: State postal code corresponding to FIPS code.
state_border_id: Border identifier for closest state border strip.
dist_to_border: Distance (in miles) of population center to the closest adjacent state border strip.
num_counties_in_strip: Number of unique adjacent counties belong to state border pair strip. Fixed effect specifications will eliminate those with a single county.
num_states_in_strip: Number of unique states corresponding to unique adjacent counties that belong to the state border pair strip. Fixed effect specifications focused on cross- border variation will eliminate those with a single state in the state border pair.