#' @references
#' **Data originated from:**
#'
#' - NCES. (2010). *Early childhood longitudinal study, kindergarten class of
#' 1998-99 (ecls-k) kindergarten through fifth grade approaches to learning
#' and self-description questionnaire (sdq) items and public-use data
#' files*. <https://nces.ed.gov/pubsearch/pubsinfo.asp?pubid=2010070>
#'
#' **Data used in:**
#'
#' - Culpepper, S. (2019). An exploratory diagnostic model for ordinal
#' responses with binary attributes: Identifiability and estimation.
#' *Psychometrika*, *84*(4), 921–940.
#' \doi{10.1007/s11336-019-09683-4}
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