#' @title Gabelhouse five-cell length categories for various species.
#'
#' @description Cutoffs for the Gabelhouse five-cell length categories for a variety of species.
#'
#' @name PSDlit
#'
#' @docType data
#'
#' @format A data frame of 58 observations on the following 11 variables:
#' \describe{
#' \item{species}{Species name.}
#' \item{group}{Sub-group name (e.g., \code{"landlocked"} or \code{"lotic"}).}
#' \item{substock.in}{Zero inches.}
#' \item{stock.in}{Stock length in inches.}
#' \item{quality.in}{Quality length in inches.}
#' \item{preferred.in}{Preferred length in inches.}
#' \item{memorable.in}{Memorable length in inches.}
#' \item{trophy.in}{Trophy length in inches.}
#' \item{substock.cm}{Zero cm.}
#' \item{stock.cm}{Stock length in cm.}
#' \item{quality.cm}{Quality length in cm.}
#' \item{preferred.cm}{Preferred length in cm.}
#' \item{memorable.cm}{Memorable length in cm.}
#' \item{trophy.cm}{Trophy length in cm.}
#' \item{source}{Literature source for the length entries.}
#' }
#'
#' @section Topic(s):
#' \itemize{
#' \item Size structure
#' \item Proportional size structure
#' \item Relative stock density
#' \item Proportional stock density
#' }
#'
#' @concept Size Structure
#' @concept PSD
#'
#' @section IFAR Chapter: 6-Size Structure.
#'
#' @seealso See \code{\link{psdVal}}, \code{\link{psdCalc}}, \code{\link{psdPlot}}, \code{\link{psdAdd}}, and \code{\link{tictactoe}} for related functionality.
#'
#' @references Ogle, D.H. 2016. \href{https://fishr-core-team.github.io/fishR/pages/books.html#introductory-fisheries-analyses-with-r}{Introductory Fisheries Analyses with R}. Chapman & Hall/CRC, Boca Raton, FL.
#'
#' @source Original summary table from Dr. Michael Hansen, University of Wisconsin-Stevens Point. Additional species have been added by the package author from the literature.
#'
#' @keywords datasets
#'
#' @examples
#' str(PSDlit)
#' head(PSDlit)
#'
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