#' Sample Data
#'
#' A dataset containing sample data related to genetic markers and associated traits.
#'
#' @format A data frame with columns:
#' \describe{
#'   \item{SNP}{SNP identifier, character.}
#'   \item{Chr}{Chromosome location, character.}
#'   \item{Pos}{Position on the chromosome, numeric.}
#'   \item{traits}{Associated traits, character.}
#' }
#' @source {Generated for demonstration purposes}
#' @examples
#' data(sample_data_wheat)    #lazy loading
"sample_data_wheat"
