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#' Plots of posterior or prior predictive distributions
#'
#' @name PPD-overview
#' @aliases PPD
#' @family PPDs
#'
#' @description The **bayesplot** PPD module provides various plotting functions
#' for creating graphical displays of simulated data from the posterior or
#' prior predictive distribution. These plots are essentially the same as the
#' corresponding [PPC] plots but without showing any observed data. Because
#' these are not "checks" compared to data we use PPD (for prior/posterior
#' predictive distribution) instead of PPC (for prior/posterior predictive
#' check).
#'
#' @section PPD plotting functions: The functions for plotting prior and
#' posterior predictive distributions without observed data each have the
#' prefix `ppd_` and all have a required argument `ypred` (a matrix of
#' predictions). The plots are organized into several categories, each with
#' its own documentation:
#' * [PPD-distributions]: Histograms, kernel density estimates, boxplots, and
#' other plots of multiple simulated datasets (rows) in `ypred`. These are the
#' same as the plots in [PPC-distributions] but without including any
#' comparison to `y`.
#'
#' * [PPD-intervals]: Interval estimates for each predicted observations
#' (columns) in `ypred`. The x-axis variable can be optionally specified by
#' the user (e.g. to plot against against a predictor variable or over
#' time).These are the same as the plots in [PPC-intervals] but without
#' including any comparison to `y`.
#'
#' * [PPD-test-statistics]: The distribution of a statistic, or a pair of
#' statistics, over the simulated datasets (rows) in `ypred`. These are the
#' same as the plots in [PPC-test-statistics] but without including any
#' comparison to `y`.
#'
#' @template reference-vis-paper
#'
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