R/extgr.R

In nverno/seedsub: Contains seedling/substrate data from Mt Moosilauke

##' Contour segments seedling extension growth data.
##'
##' This dataset contains extension growth data for seedlings, measured in 1988, 1989,
##' 1998, and 1999.  There was also some additional data collected in 2000 about the 
##' health status of some of the tagged seedlings.  Seedling information from this dataset
##' is linked to `segplants` by the ID variable.
##'
##' @format An object of class \code{data.table} (inherits from
##'   \code{data.frame}) with 32998 rows and 12 columns.
##' \itemize{
##'
##'     \item ID: Unique plant identifier, links to other seedling data in segplants.
##'     \item EX: Extension growth measurements (cm).  The number of measurements recorded
##' during a given census varied, refer to detailed notes.
##'     \item YEAR: Year of measurement.
##'     \item YRREX: Indicator variable: 1 means data after this year can be trusted.  This
##' was determined by taking into account browsed/broken tops of plants and new leaders in
##' subsequent years.
##'     \item PEX: Indicator variable: 1 if the measurement is "partial growth", 
##' meaning the measurement was taken partway through that year.  Recorded in 1989, 1998, and
##' 1999.
##'     \item NL: Indicator variable: 1 if a new leader emerged that year (this was only 
##' measured in 1999).
##'     \item TERM: Notes on the condition of the terminal leader (recorded in 1999, and 2000).
##'     \item AGE: Estimated total age of plants (only measured in 1988).
##'     \item MINAGE:  Estimated minimum age of plants (recorded in 1988, 1989, 1998, and 1999).
##'     \item D1RM: Distance remaining from the last positively identified extension growth to
##' the root collar of ABBA/PIRU seedlings (recorded in 1998 and 1999, see detailed notes).
##'     \item D2RM: Distance remaining after accounting for the minimal age of ABBA/PIRU
##' seedlings (recorded in 1998 and 1999, see detailed notes).
##'     \item ENOTE: Indicator variable for various conditions of terminal leader:
##'     \itemize{
##'        \item 1: New leader
##'        \item 2: Browse off, no ext. growth
##'        \item 3: Not browsed, just no growth.
##'        \item 4: Dead top
##'        \item 5: No dominant leader
##'     }
##' }
"extgr"