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#' Asthma in St. Louis by Census Tract, 2017
#'
#' @description A simple features data set containing the geometry and asthma estimates
#' from the Centers for Disease Control for St. Louis.
#'
#' @docType data
#'
#' @usage data(ar_stl_asthma)
#'
#' @format A data frame with 106 rows and 24 variables:
#' \describe{
#' \item{GEOID}{full GEOID string}
#' \item{STATEFP}{state FIPS code}
#' \item{COUNTYFP}{county FIPS code}
#' \item{TRACTCE}{tract FIPS code}
#' \item{NAMELSAD}{tract name}
#' \item{ALAND}{area of tract land, square meters}
#' \item{AWATER}{area of tract water, square meters}
#' \item{ASTHMA}{percent of residents with current asthma diagnosis, estimated}
#' \item{geometry}{simple features geometry}
#' }
#'
#' @source Centers for Disease Control's 500 Cities Data
#'
#' @examples
#' str(ar_stl_asthma)
#' head(ar_stl_asthma)
#' summary(ar_stl_asthma$ASTHMA)
#'
"ar_stl_asthma"
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