#' @title Ages of Lake Whitefish from four lakes assigned from scales and fin-rays.
#'
#' @description Ages of Lake Whitefish (\emph{Coregonus clupeaformis}) from four lakes as determined by scales and fin-rays.
#'
#' @name WhitefishMB
#'
#' @docType data
#'
#' @format A data frame with 859 observations on the following 3 variables:
#' \describe{
#' \item{fin}{Ages assigned from fin-ray sections}
#' \item{scale}{Ages assigned from scales}
#' \item{lake}{Lake from which the fish was captured (\code{L122}, \code{L226}, \code{Huron}, or \code{Dezadeash})}
#' }
#'
#' @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 (approximately) Figure 1 of Mills, K.H., and R.J. Beamish. 1980. Comparison of fin-ray and scale age determinations for lake whitefish (\emph{Coregonus clupeaformis}) and their implications for estimates of growth and annual survival. Canadian Journal of Fisheries and Aquatic Sciences 37:534-544. \href{https://raw.githubusercontent.com/fishR-Core-Team/FSAdata/main/data-raw/WhitefishMB.csv}{CSV file}
#'
#' @keywords datasets
#'
#' @examples
#' data(WhitefishMB)
#' str(WhitefishMB)
#' head(WhitefishMB)
#' op <- par(mfrow=c(2,2),pch=19)
#' plot(scale~fin,data=WhitefishMB,subset=lake=="L122",main="Lake L122")
#' plot(scale~fin,data=WhitefishMB,subset=lake=="L226",main="Lake L226")
#' plot(scale~fin,data=WhitefishMB,subset=lake=="Huron",main="Huron")
#' plot(scale~fin,data=WhitefishMB,subset=lake=="Dezadeash",main="Dezadeash")
#' par(op)
#'
NULL
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