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#' U.S. Major League Batting Average Data: 2002-2012
#'
#' Data frame consisting of the following variables:
#'
#' Data is aggregated into half seasons: so season indicates whether
#' the observation is in the first or second half of the season of a
#' given year. Only players who have more than 10 at bats in any half
#' season are included, and only players who have more than three
#' half seasons are represented. The transformed batting average is
#' \eqn{arcsin(sqrt((H + 1/4)/(AB + 1/2)))}. Only regular seasons data are included.
#' R programs to extract the data from the original sources are available on request.
#' \itemize{
#' \item Name
#' \item IdNum
#' \item Year
#' \item Halfseason
#' \item Pitcher
#' \item HA transformed batting average;
#' \item AB at bats
#' \item H hits
#' \item BB walks
#' \item YOB Year of Birth;
#' \item age age of the player
#' \item agesq age squared
#' }
#' @source ESPN Website: \url{https://www.espn.com/mlb/stats}
#' @references Gu, Jiaying and Roger Koenker (2015) Empirical Bayesball Remixed:
#' Empirical Bayes Methods for Longitudinal Data, J. Applied Econometrics, forthcoming.
#' @keywords data
#' @name bball
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