#' rasch: Pairwise Conditional Rasch Measurement Analysis and Diagnostics
#'
#' Pairwise conditional maximum likelihood estimation of dichotomous and
#' polytomous Rasch models (partial credit and rating scale) after Andrich
#' and Luo (2003) and Zwinderman (1995), with Warm weighted likelihood
#' person estimates and a comprehensive diagnostic suite: item and
#' person fit residuals, the item-trait interaction chi-square and class
#' interval ANOVA, the person separation index, Cronbach's alpha, targeting,
#' test information, the score-to-measure table, threshold and category
#' diagnostics, residual-component dimensionality testing, local dependence
#' by residual correlation, and differential item functioning by two-way
#' residual analysis of variance over multiple person factors. Includes a
#' modern Shiny interface (\code{\link{run_app}}) and a one-call exporter
#' (\code{\link{save_outputs}}).
#'
#' @keywords internal
#' @import stats
#' @import graphics
#' @import grDevices
#' @importFrom utils write.csv combn
"_PACKAGE"
