#' Clustered dataset for centering example
#'
#' Dataset of 60 observations from 3 clusters.
#'
#' @format A wide data frame of 60 observations. Used for discussing within and between group effects.
#' \describe{
#' \item{x}{The predictor.}
#' \item{y}{The outcome of interest.}
#'
#' }
"cdata.ex"
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