R/tobacco.R

In StepReg: Stepwise Regression Analysis

#' tobacco
#'
#' data on chemical components of 25 tobacco leaf
#'
#' \itemize{
#'   \item cigarette Rate of cigarette burn in inches per 1000 seconds.
#'   \item sugar Percent sugar in the leaf.
#'   \item nicotine Percent nicotine.
#'   \item nitrogen Percentage of nitrogen.
#'   \item chlorine Percentage of chlorine.
#'   \item potassium Percentage of potassium.
#'   \item phosphorus Percentage of phosphorus
#'   \item calcium Factor. Percentage of calcium.
#'   \item magnesium Percentage of magnesium.
#' }
#'
#' @name tobacco
#' 
#' @keywords datasets
#' 
#' @docType data
#' 
#' @usage data(tobacco)
#' 
#' @format A data frame containing 25 observations on 9 variables.
#' 
#' @references 
#' 
#' Anderson, R. L. and Bancroft, T. A. (1952), Statistical Theory in Research, McGraw-Hill Book Company, Inc., New York, NY.
#' 
"tobacco"