#' US Gini Coefficient Data
#'
#' Contains the Gini coefficient for the United States from 1947 to 2013.
#'
#' @format A data frame with 67 rows and 3 variables:
#' \describe{
#' \item{ .row }{ integer: row number }
#' \item{ year }{ integer: year }
#' \item{ gini }{ numeric: US Gini coefficient }
#' }
#'
#'
#' @details
#' See \emph{QSS} Table 3.4.
#'
#'
#' @references
#' Imai, Kosuke. 2017. \emph{Quantitative Social Science: An Introduction}.
#' Princeton University Press. \href{http://press.princeton.edu/titles/11025.html}{URL}.
#'
"USGini"
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