R/data-trlhawaii.r

In biometrics: A Package for Biometrics and Modelling

#' Tree-level information of forest plots across the Hawaiian archipelago.
#' @description
#' Diameter at breast height (or occurrence) of individual trees, shrubs
#' and tree
#'  ferns across 530 plots across the Hawaiian archipelago and includes native
#'   status and cultivated status of the 185 species.
#' @usage
#' data(trlhawaii)
#' @format Contains 18 variables, as follows:
#' \describe{
#'   \item{island}{Island name.}
#'   \item{plot.id}{Unique numeric identifier for each plot.}
#' \item{study}{Brief name of study.}
#' \item{plot.area}{Plot area in m\eqn{^{2}}{^2}.}
#' \item{longitude}{Longitude of plot in decimal degrees; WGS84 coordinate
#'  system.}
#' \item{latitude}{Latitude of plot in decimal degrees; WGS84 coordinate
#'  system.}
#' \item{year}{Year in which plot data was collected.}
#' \item{census}{Numeric identifier for each census.}
#' \item{tree.id}{Unique numeric identifier for each individual.}
#' \item{scientific.name}{Genus and species of each individual following
#' TPL v. 1.1.}
#' \item{family}{Family of each individual following TPL v. 1.1.}
#' \item{angiosperm}{Binary variable (`1` = yes, `0` = no) indicating whether
#'  an individual is classified as an angiosperm following APG III.}
#' \item{monocot}{Binary variable (`1` = yes, `0` = no) indicating whether an
#'  individual is classified as a monocot following APG III.}
#' \item{native.status}{Categorical variable (`native`, `alien`, `uncertain`)
#'  indicating alien status of each individual following Wagner _et al_. (2005).}
#' \item{cultivated.status}{Binary variable (`1` = yes, `0` = no,
#'  `NA` = not applicable) indicating if species is cultivated following PIER.}
#' \item{abundance}{Number of individuals (all = 1).}
#' \item{abundance.ha}{Abundance of each individual on a per hectare basis.}
#' \item{dbh}{Diameter at 1.3 m (in cm) for each individual; `NA` indicates that
#' size was not measured, but was classified by size class.}
#'  }
#' @source
#' The data were obtained from the DRYAD
#'  repository at \doi{10.5061/dryad.1kk02qr}.
#' @references
#' - Craven D, Knight T, Barton K, Bialic-Murphy L, Cordell S,
#' Giardina C, Gillespie T, Ostertag R, Sack L,Chase J. 2018.
#' OpenNahele: the open Hawaiian forest plot database.
#'  Biodiversity Data Journal 6: e28406.
#' @examples
#' data(trlhawaii)
#' table(trlhawaii$island,trlhawaii$study)
#' unique(trlhawaii$plot.id)
#' table(trlhawaii$plot.id)
#' tapply(trlhawaii$plot.area,trlhawaii$study,summary)
'trlhawaii'