#' @title Ages of Atlantic Croaker assigned from otoliths by two readers.
#'
#' @description Otolith age of Atlantic croaker (\emph{Micropogonias undulatus}) from two readers.
#'
#' @name Croaker1
#'
#' @docType data
#'
#' @format A data frame of 317 observations on the following 2 variables:
#' \describe{
#' \item{reader1}{Age assigned by the first reader}
#' \item{reader2}{Age assigned by the second reader}
#' }
#' @section Topic(s):
#' \itemize{
#' \item Age Comparison
#' \item Age Precision
#' \item Age Bias
#' \item Ageing Error
#' }
#'
#' @concept Age Precision
#' @concept Age Bias
#' @concept Age Comparison
#'
#' @source From Figure 2 in Chapter 1 (Atlantic Croaker) of the VMRC Final Report on Finfish Ageing, 1999 by the Center for Quantitative Fisheries Ecology at Old Dominion University. \href{https://raw.githubusercontent.com/fishR-Core-Team/FSAdata/main/data-raw/Croaker1.csv}{CSV file}
#'
#' @keywords datasets
#'
#' @examples
#' data(Croaker1)
#' str(Croaker1)
#' head(Croaker1)
#' plot(reader2~reader1,data=Croaker1)
#' xtabs(~reader1+reader2,data=Croaker1)
#'
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