#' @references
#'
#' **Assessment Design:**
#'
#' - Raven, J. C. (1941). Standardization of progressive matrices, 1938.
#' *British Journal of Medical Psychology*, *19*(1), 137–150.
#' \doi{10.1111/j.2044-8341.1941.tb00316.x}
#'
#' **Data originated from:**
#'
#' - Myszkowski, N., & Storme, M. (2018). A snapshot of g? Binary and
#' polytomous item-response theory investigations of the last series of the
#' standard progressive matrices (spm-ls). *Intelligence*, *68*, 109–116.
#' \doi{10.1016/j.intell.2018.03.010}
#' - Robitzsch, A. (2020). Regularized latent class analysis for polytomous
#' item responses: An application to spm-ls data. *Preprint*.
#' \doi{10.20944/preprints202007.0269.v1}
#'
#' **Data used in:**
#'
#' - TBA
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