R/data-idahohd.r

In datana: Datasets and Functions to Accompany Analisis De Datos Con R

#' Tree height-diameter data from Idaho (USA)  
#' @description
#' These data are forest inventory measures from the Upper Flat Creek stand 
#' of the University of Idaho Experimental Forest, dated 1991.   
#' @usage
#' data(idahohd)
#' @format Contains five variables, as follows:
#' \describe{
#'   \item{plot}{Plot number.}
#'   \item{tree}{Tree within plot.}
#' \item{species}{A factor with levels DF = Douglas-fir, GF = Grand fir, 
#' SF = Subalpine fir, WL = Western larch,
#'                 WC = Western red cedar, WP = White pine.}
#' \item{dbh}{Diameter 137 cm perpendicular to the bole, cm.}
#' \item{height}{Height of the tree, in m.}
#'  }
#' @source 
#' The data were assembled from the 'ufc' dataframe from the \eqn{alr4} library.  
#' @references
#' Weisberg S. 2014. Applied Linear Regression. 4th edition. New York: Wiley.
#' @examples
#' data(idahohd)    
#' head(idahohd) 
#' plot(height~dbh, data=idahohd)
'idahohd'