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#' Russett A
#'
#' Russett dataset with variable \code{demo} as numeric variable
#'
#' @docType data
#' @name russa
#' @usage russa
#' @format A data frame with 47 rows and 9 columns
#' @keywords datasets
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#' Russett B
#'
#' Russett dataset with variable \code{demo} as factor
#'
#' @docType data
#' @name russb
#' @usage russb
#' @format A data frame with 47 rows and 9 columns
#' @keywords datasets
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