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#' Complete Two-Factor Experiment
#'
#' @details
#' A gene expression experiment was run to assess the effect of a compound
#' under two different diets: high fat and low fat. The main comparisons of
#' interest are the difference between the treated and untreated groups within
#' a diet. The interaction effect was a secondary hypothesis. For illustration,
#' we only include the expression value of one of the genes. The study design
#' was a full two-way factorial with `n = 24` samples.
#'
#' @name two_factor_crossed
#' @docType data
#' @return \item{two_factor_crossed}{A data frame}
#' @keywords datasets
#' @examples
#' two_factor_crossed
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#' Incomplete Two-Factor Experiment with Repeated Measurments
#'
#' @details
#' In a gene expression experiment, stem cells were differentiated using a set
#' of factors (such as media types, cell spreads etc.). These factors were
#' collapsed into a single cell environment configurations variable. The cell
#' lines were assays over three days. Two of the configurations were only run
#' on the first day and the other two were assays at baseline.
#'
#' To get the materials, three donors provided materials. These donors
#' provided (almost) equal replication across the two experimental factors (day
#' and configuration).
#'
#' One of the goals of this experiment was to assess pre-specified
#' differences in the configuration at each time point. For example, the
#' differences between configurations `A` and `B` at day one is of interest.
#' Also, the differences between configurations `C` and `D` at each time points
#' were important.
#'
#' Since there are missing cells in the design, it is not a complete two-way
#' factorial. One way to analyze this experiment is to further collapse the
#' time and configuration data into a single variable and then specify each
#' comparison using this factor.
#'
#' @name two_factor_incompl
#' @docType data
#' @return \item{two_factor_incompl}{A data frame}
#' @keywords datasets
#' @examples
#' two_factor_incompl
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