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# CITATION.cff file created with {cffr} R package
# See also: https://docs.ropensci.org/cffr/
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cff-version: 1.2.0
message: 'To cite package "catchmentACS" in publications use:'
type: software
license: MIT
title: 'catchmentACS: Isochrone-Based Area-Weighted ACS Aggregation'
version: 0.6.0
abstract: 'Computes American Community Survey (ACS) estimates for the area within
  a given drive time of each of a set of points, such as the locations of pre-kindergarten
  classrooms. Such an area is called an isochrone. The drive-time areas come from
  a routing service, either the ''Open Source Routing Machine'' (''OSRM'', <https://project-osrm.org/>)
  or ''openrouteservice'' (<https://openrouteservice.org/>), and the ACS 5-year estimates
  of census tracts come from the Census Bureau (<https://www.census.gov/data/developers.html>)
  through the ''tidycensus'' package, one state at a time. The tracts that overlap
  an area are combined by area weighting, which uses two weights: the share of each
  tract''s area that lies inside, for counts and rates, and each tract''s share of
  the overlapping area, for the medians and per-person values of three ACS tables
  (median household income, median home value, and per capita income). A median or
  per-person value from any other table is added up like a count. Counts, medians,
  per-person values, and five rates are returned with a margin of error at a chosen
  confidence level, 90 percent by default, and with a record of the settings, inputs,
  and package versions behind the run. The five rates are the poverty rate, the shares
  of households receiving Supplemental Nutrition Assistance Program (SNAP) benefits
  and Supplemental Security Income, the unemployment rate, and the labor force participation
  rate. The margins of error of counts and rates use the approximation formulas in
  chapter 8 of U.S. Census Bureau (2020) "Understanding and Using American Community
  Survey Data: What All Data Users Need to Know" <https://www.census.gov/programs-surveys/acs/library/handbooks/general.html>.
  For a count the formula for a sum is applied to the weighted tract estimates, with
  the weights treated as fixed. For a rate the default is the formula for a ratio.
  Its margin of error is at least as wide as that of the formula for a proportion,
  which the handbook gives for ratios whose numerator is part of the denominator,
  as it is in all five rates. The margins of error of medians and per-person values
  are an approximation made by the package.'
authors:
- family-names: Lee
  given-names: JoonHo
  email: jlee296@ua.edu
  orcid: https://orcid.org/0009-0006-4019-8703
preferred-citation:
  type: manual
  title: 'catchmentACS: Isochrone-Based Area-Weighted ACS Aggregation'
  authors:
  - family-names: Lee
    given-names: JoonHo
    email: jlee296@ua.edu
    orcid: https://orcid.org/0009-0006-4019-8703
  year: '2026'
  notes: R package version 0.6.0
  url: https://github.com/joonho112/catchmentACS
repository: https://joonho112.r-universe.dev
repository-code: https://github.com/joonho112/catchmentACS
commit: 42dcf3848066cee2691dbc863a4d6de021c10f0a
url: https://joonho112.github.io/catchmentACS/
date-released: '2026-09-24'
contact:
- family-names: Lee
  given-names: JoonHo
  email: jlee296@ua.edu
  orcid: https://orcid.org/0009-0006-4019-8703