R/data.R

In AnthonyRaborn/cvIRT: Cross Validation and Bootstrap Methods for IRT Model Selection

#' TIMSS 2015 4th Grade Math Polytomous Item Parameters.
#'
#' A dataset containing multiple sets of polytomous item parameters based on the 2015 TIMSS Math test.
#'
#' @format A data frame with 160 rows and 7 columns:
#' \describe{
#'   \item{Item}{the item}
#'   \item{Model}{the polytomous model it fits}
#'   \item{Step1}{the first step difficulty parameter}
#'   \item{Difficulty}{the difficulty parameter}
#'   \item{Step2}{the second step difficulty parameter}
#'   \item{Discrimination}{the item discrimination}
#'   \item{Reversed}{whether the item step parameters are allowed to be reversed (Step2 < Step1)}
#'   }
#' @source \url{https://timss.bc.edu/timss2015/international-database/}
#'
"TIMSSParameters"