trtools: Miscellaneous Tools for Teaching Statistics

#' House sparrow survival data. 
#'
#' Measurements of samples of house sparrows (Passer domesticus) brought to the Anatomical Laboratory at Brown University after a severe storm. They were published by Bumpus (1898) who used the data to illustrate natural selection. 
#'
#' @format A data frame of 136 observations and 13 variables:
#' \describe{
#'    \item{line:}{line number from Bumpus' table}
#'    \item{sex:}{male (m) or female (f)}
#'    \item{age:}{adult (a) or young (y) for males only}
#'    \item{survival:}{logical indicating survival of the storm}
#'    \item{length:}{length (mm) from "beak to the tip of the tail"}
#'    \item{alar:}{alar extent (mm) from "tip to tip of the extended wings"}
#'    \item{weight:}{weight in grams}
#'    \item{head:}{length of beak and head (mm) "from tip of the beak to the occiput"}
#'    \item{humerus:}{length (in) of the humerus}
#'    \item{femur:}{length (in) of the femur}
#'    \item{tibiotarsus:}{length (in) of the tibiotarsus}
#'    \item{skull:}{width (in) of skull "from the postorbital bone of one side to the postorbital bone of the other"}
#'    \item{keel:}{length (in) of keel of the sternum}
#' }
#'
#' @note The data and variable descriptions were retrieved from https://www.fieldmuseum.org/science/blog/hermon-bumpus-and-house-sparrows.
#'
#' @source Bumpus, H. C. (1898). Eleventh lecture. The elimination of the unfit as illustrated by the introduced sparrow, Passer domesticus. (A fourth contribution to the study of variation.) Biological Lectures: Woods Hole Marine Biological Laboratory, 209-225. 
#' 
"bumpus"