#' @param horizon Horizon where to compute the error (<= horizon used in \code{computeForecast})
#'
#' @return A list (abs,MAPE) of lists (day,indices)
#'
#' @export
#' @param horizon Horizon where to compute the error (<= horizon used in \code{computeForecast})
#'
#' @return A list (abs,MAPE) of lists (day,indices)
#'
#' @export