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#' Data related to happiness from the General Social Survey, 1972-2006.
#'
#' This data extract is taken from Hadley Wickham's \code{productplots} package.
#' The original description follows, with minor edits.
#'
#' The data is a small sample of variables related to
#' happiness from the General Social Survey (GSS). The GSS
#' is a yearly cross-sectional survey of Americans, run from
#' 1972. We combine data for 25 years to yield 51,020
#' observations, and of the over 5,000 variables, we select
#' nine related to happiness:
#'
#' @details \itemize{
#' \item age. age in years: 18--89.
#' \item degree. highest education: lt high school, high school, junior college, bachelor, graduate.
#' \item finrela. relative financial status: far above, above average, average, below average, far below.
#' \item happy. happiness: very happy, pretty happy, not too happy.
#' \item health. health: excellent, good, fair, poor.
#' \item marital. marital status: married, never married, divorced, widowed, separated.
#' \item sex. sex: female, male.
#' \item wtsall. probability weight. 0.43--6.43.
#' }
#'
#' @docType data
#' @keywords datasets
#' @name happy
#' @usage data(happy)
#' @format A data frame with 51020 rows and 10 variables
#' @references
#' Smith, Tom W., Peter V. Marsden, Michael Hout, Jibum Kim. \emph{General Social Surveys, 1972-2006}.
#' \[machine-readable data file\]. Principal Investigator, Tom W. Smith; Co-Principal Investigators,
#' Peter V. Marsden and Michael Hout, NORC ed.
#' Chicago: National Opinion Research Center, producer, 2005;
#' Storrs, CT: The Roper Center for Public Opinion Research, University of Connecticut, distributor.
#' 1 data file (57,061 logical records) and 1 codebook (3,422 pp).
NULL
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