#' Gay Marriage Study Data
#'
#' Data from an experiment that analyzed whether contact with a gay canvasser affected
#' opinions on gay marriage.
#'
#' @format A data frame with 69592 rows and 4 variables:
#' \describe{
#' \item{ study }{ integer: source of the data (1 = study 1, 2 = study 2) }
#' \item{ treatment }{ character: five possible treatment assignment options }
#' \item{ wave }{ integer: survey wave (a total of seven waves)}
#' \item{ ssm }{ integer: five-point scale on same-sex marriage, higher scores indicate support }
#' }
#'
#'
#' @details
#' See \emph{QSS} Table 2.7.
#'
#'
#' @references
#' \itemize{
#' \item{ Imai, Kosuke. 2017. \emph{Quantitative Social Science: An Introduction}.
#' Princeton University Press. \href{http://press.princeton.edu/titles/11025.html}{URL}. }
#' \item {Michael J. LaCour and Donald P. Green (2015) “When contact changes minds:
#' An experiment on transmission of support for gay equality.” \emph{Science}, vol. 346,
#' no. 6215, pp. 1366–1369. doi: 10.1126/science.1256151 }
#'}
"gay"
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