#' Marginal proportions from the PISA 2012 background questionnaire
#'
#' @format A list of 19 named numeric vectors.
#'
#' @section Details:
#'
#' A list containing the marginal cumulative proportions for each response category from the PISA 2012 background questionnaire.
#' Elements 1 - 18 are the marginal proportions for the selected items from the background questionnaire.
#' Element 19 is the marginal proportion for the selected mathematics plausible value.
#'
#' \tabular{llll}{
#' \strong{Row/Col} \tab \strong{Name} \tab \strong{Label} \tab \strong{Length} \cr
#' 1 \tab ST93Q01 \tab Perseverance \tab 5 \cr
#' 2 \tab ST93Q03 \tab Perseverance \tab 5 \cr
#' 3 \tab ST93Q04 \tab Perseverance \tab 5 \cr
#' 4 \tab ST93Q06 \tab Perseverance \tab 5 \cr
#' 5 \tab ST93Q07 \tab Perseverance \tab 5 \cr
#' 6 \tab ST94Q05 \tab Openness for Problem Solving \tab 5 \cr
#' 7 \tab ST94Q06 \tab Openness for Problem Solving \tab 5 \cr
#' 8 \tab ST94Q09 \tab Openness for Problem Solving \tab 5 \cr
#' 9 \tab ST94Q10 \tab Openness for Problem Solving \tab 5 \cr
#' 10 \tab ST94Q14 \tab Openness for Problem Solving \tab 5 \cr
#' 11 \tab ST88Q01 \tab Attitude toward School \tab 4 \cr
#' 12 \tab ST88Q02 \tab Attitude toward School \tab 4 \cr
#' 13 \tab ST88Q03 \tab Attitude toward School \tab 4 \cr
#' 14 \tab ST88Q04 \tab Attitude toward School \tab 4 \cr
#' 15 \tab ST89Q02 \tab Attitude toward School \tab 4 \cr
#' 16 \tab ST89Q03 \tab Attitude toward School \tab 4 \cr
#' 17 \tab ST89Q04 \tab Attitude toward School \tab 4 \cr
#' 18 \tab ST89Q05 \tab Attitude toward School \tab 4 \cr
#' 19 \tab 1PV1MATH \tab Mathematics Plausible Value 1 \tab 1 \cr
#' }
#'
#' @section Warning:
#'
#' These data are for illustration purposes only. Handling of missing data may not be suitable for valid inferences.
#'
#' @source
#' Raw data can be found at \url{https://www.oecd.org/pisa/pisaproducts/pisa2012database-downloadabledata.htm}
#' Codebook can be found at \url{https://www.oecd.org/pisa/pisaproducts/PISA12_stu_codebook.pdf}
#'
"pisa2012_q_marginal"
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