R/photocounts.R

In trobinj/trtools: Miscellaneous Tools for Teaching Statistics

#' Aerial photograph and field counts of dead trees.
#'
#' Counts of dead trees using aerial photographs and field counts in a 80ha parcel of land divided into 80 units. Field counts are more costly but also more accurate than those based on aerial photographs. 
#'
#' @format A data frame with 80 observations and two variables:
#' \describe{
#'    \item{photo}{count of dead trees from aerial photograph}
#'    \item{field}{count of dead trees from the field}
#' }
#'
#' @source Barrett, J. P. & Nutt, M. E. (1979). \emph{Survey sampling in the environmental sciences: A computer approach}. Wentworth, NH: COMPress, Inc.
#'
#' Gregoire, T. G. & Valentine, H. T. (2007). \emph{Sampling strategies for natural resources and the environment}. Boca Raton, FL: Chapman & Hall/CRC.
"photocounts"