#' Graham's (2006) first unidimensional data
#'
#' Graham's (2006) artificial dataset consisting of five items.This is the
#' second dataset in his Table 2. The last item is about five times as important
#' as the other items. This dataset provides a good indication of how sensitive
#' each reliability coefficient is to the violation of the tau equivalence
#' assumption. The CFA reliability coefficient presented by the author is .97.
#' @docType data
#' @usage data(Graham1)
#' @source Graham, J. M. (2006). Congeneric and (essentially) tau-equivalent
#' estimates of score reliability what they are and how to use them. Educational
#' and Psychological Measurement, 66(6), 930-944.
#' Education and Macmillan.
#' @author Eunseong Cho, \email{bene@kw.ac.kr}
#'
"Graham1"
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