#' Data from a multiphase forest inventory at the zurichberg (zurich), switzerland
#'
#' A dataset from 1991 containing 1203 sample plots observations from a forest inventory using cluster-sampling.
#' The large phase comprises 298 clusters. Terrestrial information of the stem number as well as the basal area
#' is available for a systematic subsample of 73 clusters. Auxiliary information at all 2103 sample plots were
#' derived by stand maps. Originally the inventory was carried out as a twophase inventory and
#' has been artificially extended to a threephase inventory for demonstration purposes.
#'
#'
#'\itemize{
#' \item{\code{cluster} cluster identification. Maximum number of sample plots per cluster is 5.}
#' \item{\code{phase_id_2p} phase-membership of each observation for the twophase inventory.
#' The first phase is indicated by \code{1}, the second (i.e. terrestrial) phase by \code{2}.}
#' \item{\code{phase_id_3p} the phase-membership of each observation for the threephase inventory,
#' i.e. the first phase (\code{0}), the second phase (\code{1})
#' and third (terrestrial) phase (\code{2}). \emph{Note:} The threephase sample scheme
#' was artificially created for demonstration purposes of the
#' \code{\link{threephase}}-functions.}
#' \item{\code{stade} development stage at sample plot location based on the stand map.
#' Categorical variable of class \code{factor} with 4 \code{levels}.}
#' \item{\code{melange} degree of mixture at sample plot location based on the stand map.
#' Categorical variable of class \code{factor} with 2 \code{levels}.}
#' \item{\code{couver} crown-coverage at sample plot location based on the stand map.
#' Categorical variable of class \code{factor} with 2 \code{levels}.}
#' \item{\code{stem} stem number derived at field survey.}
#' \item{\code{basal} basal area derived at field survey.}
#' \item{\code{ismallg23} indicator for small area 2 and 3 for each observation.}
#' \item{\code{ismallold} indicator for small area 1 for each observation.}
#'}
#'
#'
#'
#' @format data frame with 1203 rows and 12 columns
#' @source Data provided by D.Mandallaz
#'
#'@references Mandallaz, Daniel (1991). \emph{A unified approach to sampling theory for forest inventory
#' based on infinite population and superpopulation models.} http://dx.doi.org/10.3929/ethz-a-000585900
#'
#' Mandallaz, Daniel (1993). \emph{Geostatistical methods for double sampling schemes. application to combined forest inventories.}
#' Chair of Forest Inventory and Planning, Swiss Federal Institute of Technology (ETH). http://dx.doi.org/10.3929/ethz-a-000943897
#'
"zberg"
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