#' Sesame Street data based on Stevens (1999)
#'
#' Synthetic data based Stevens (1999, p. 596). This study
#' evaluates the effects of the first year of the Sesame Street television series
#' in a sample of 3-5 years old children in the USA (N = 240).
#'
#' \tabular{lll}{
#' \strong{age} \tab \code{numeric} \tab Age in months\cr
#' \strong{prebody} \tab \code{numeric} \tab Pretest on knowledge of
#' body parts\cr
#' \strong{prelet} \tab \code{numeric} \tab Pretest on knowledge of letters\cr
#' \strong{preform} \tab \code{numeric} \tab Pretest on knowledge of forms\cr
#' \strong{prenumb} \tab \code{numeric} \tab Pretest on knowledge of
#' numbers\cr
#' \strong{prerelat} \tab \code{numeric} \tab Pretest on knowledge of
#' relational terms\cr
#' \strong{preclas} \tab \code{numeric} \tab Pretest on classification
#' skills\cr
#' \strong{postbody} \tab \code{numeric} \tab Posttest on knowledge of
#' body parts\cr
#' \strong{postlet} \tab \code{numeric} \tab Posttest on knowledge of letters\cr
#' \strong{postform} \tab \code{numeric} \tab Posttest on knowledge of forms\cr
#' \strong{postnumb} \tab \code{numeric} \tab Posttest on knowledge of
#' numbers\cr
#' \strong{postrelat} \tab \code{numeric} \tab Posttest on knowledge of
#' relational terms\cr
#' \strong{postclas} \tab \code{numeric} \tab Posttest on classification
#' skills\cr
#' \strong{peabody} \tab \code{numeric} \tab Mental age score obtained from
#' the Peabody Picture Vocabulary test
#' }
#' @docType data
#' @keywords datasets
#' @name stevens_1999
#' @usage data(stevens_1999)
#' @references Stevens, J. (1999). Applied multivariate statistics for the
#' social sciences. (3rd ed.). New Jersey, Lawrance Erlbaum Associates, Inc.
#' @format A data frame with 240 rows and 14 variables.
NULL
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