cv.glmmLasso: Cross-validation for multi-level lasso

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#' The soccer data contains different covariables for the teams that played in 
#' the first Germna soccer division, the Bundesliga, in the seasons 2007/2008 
#' until 2009/2010.
#'
#' A dataset containing the prices and other attributes of almost 54,000
#' diamonds.
#'
#' @format A data frame with 54 observations on the following 16 variables:
#' \describe{
#'   \item{pos}{the final league rank of a soccer team at the end of the season}
#'   \item{team}{}
#'   \item{points}{number of the points a team has earned during the season}
#'   \item{transfer.spendings}{the amount (in Euro) that a team has spent for new players at the start of the season}
#'   \item{transfer.receits}{the amount (in Euro) that a team has earned for the selling of players at the start of the season}
#'   \item{yellow.card}{number of the yellow cards a team has received during the season}
#'   \item{yellow.red.card}{number of the yellow-red cards a team has received during the season}
#'   \item{red.card}{number of the red cards a team has received during the season}
#'   \item{unfair.score}{average unfairness score per match}
#'   \item{ave.unfair.score}{unfairness score which is derived by the number of yellow cards (1 unfairness point), yellow-red cards (2 unfairness points) and red cards (3 unfairness points) a team has received during the season}
#'   \item{ball.possession}{average percentage of ball possession per match}
#'   \item{tackles}{average percentage of head-to-head duels won per match}
#'   \item{capacity}{capacity of the team's soccer stadium}
#'   \item{total.attend}{total attendance of a soccer team for the whole season}
#'   \item{ave.attend}{average attendance of a soccer team per match}
#'   \item{sold.out}{number of stadium sold outs during a season}
#'   ...
#' }
#' @source \url{https://www.rdocumentation.org/packages/glmmLasso/versions/1.5.1/topics/soccer}
"soccer"

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