trtools: Miscellaneous Tools for Teaching Statistics

#' Toxicity of sodium bromide on the reproduction of Daphnia magna. 
#'
#' The data are from study that exposed populations of Daphnia magna to different concentrations of sodium bromide (NaBr) over 23 days. The number of offspring produced per adult was observed.
#'
#' @format A data frame of 50 observations on two variables:
#' \describe{
#'    \item{young:}{number of offspring per adult over 23 days}
#'    \item{concentration:}{concentration of sodium bromide (micrograms per liter)}
#' }
#'
#' @source Maul, A., El-Shaarawi, A. H., and Férard, J. F. (1991). Application of negative binomial regression models to the analysis of quantal bioassay data. \emph{Environmetrics}, \emph{2}, 253--261. The data are also featured in Maul, A. (1992). Application of generalized linear models to the analysis of toxicity test data. \emph{Environmental Monitoring and Assessment}, \emph{23}, 153--163.
#' 
"nabr"