#' student_status_norms_2011_dense_extended 2011 norm data densified and extended
#'
#' Builds on student_status_norms_2011. Two data processing steps have been performed:
#' 1) densification by percentile. For many grade levels, one step on the RIT scale
#' equates to more than one percentile point. For instnace, moving from RIT 212 to 213
#' might be a jump from the 51st to 54th percentile. This dataframe 'densifies' the
#' scale so that entries exist for the 52nd and 53rd percentile (mapping back to RIT 212).
#' 2) extending norms into HS. The normative study doesn't cover all grades and subjects -
#' in 2011, comparatively few HS students took MAP. Rather than return nothing at all
#' for, say, 12th grade Reading, this data frame extends the norms from the previous grade
#' where data exists. This is an imperfect approximation, to be sure, but is at least
#' directionally accurate.
#'
#' @format
#' \describe{
#' \item{measurementscale}{measurementscale}
#' \item{fallwinterspring}{fallwinterspring}
#' \item{grade}{grade}
#' \item{RIT}{RIT}
#' \item{percentile}{percentile}
#' }
#' @source http://support.nwea.org/support/article/rit-scale-norms-study-data-files
"student_status_norms_2011_dense_extended"
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