datums: Miscellaneous Data Sets

#' Galton's cow weight-judging competition data
#' 
#' Distribution of 787 guesses in a cow weight-judging competition.
#' These data was used by Galton to in a series of letters to
#' \emph{Nature} to illustrate the wisdom of crowds.
#' 
#' The actual weight of the cow was 1,198 pounds.
#' 
#' @format A data frame with 19 rows and 3 columns.
#' 
#' \tabular{lll}{
#' name \tab type \tab description \cr
#' \code{quantile} \tab \code{"numeric"} \tab Quantile of the distribution of guesses. \cr
#' \code{estimate} \tab \code{"numeric"} \tab Value of the guess (lbs.) \cr
#' \code{normal} \tab \code{"numeric"} \tab Quantile values of a normal distribution with a median of 1,207 lbs. and a probable error (half the interquartile range) of 37 lbs (standard deviation of 25 lbs).
#'  \cr
#' }
#' 
#' @source Galton, Francis. 1907. "Vox Populi." \emph{Nature}. \href{http://dx.doi.org/10.1038/075414a0}{doi:10.1038/075414a0}
#' 
#' @references Galton, Francis. 1907. "One Value, One Vote." \emph{Nature}. \href{http://dx.doi.org/10.1038/075414a0}{doi:10.1038/075414a0}
#' 
#' @references Galton, Francis. 1907. "Ballot Box." \emph{Nature} \href{http://dx.doi.org/10.1038/075509e0}{doi:10.1038/075509e0}
#' 
#' @references Hooke, R. H. 1907. "Mean or Median." \emph{Nature}.  \href{http://dx.doi.org/10.1038/075487a0}{doi:10.1038/075487a0}
#' 
#' @references Yule, G. Udny. 1907. "Mean or Median." \emph{Nature}.  \href{http://dx.doi.org/10.1038/075534b0}{doi:10.1038/075534b0}
#' 
#' @references Kenneth W. Wallis. 2014. "Revisiting Francis Galton's Forecasting Competition" \url{https://arxiv.org/pdf/1410.3989.pdf}
#' 
#' @references Levy, D. M. and Peart, S. (2002). Galton's two papers on voting as robust estimation. \emph{Public Choice} 113 357–365.
"VoxPopuli"