These are a subset of the von Guttenberg data, a set of measurements on Norway spruce (Picea abies [L.] Karst) in several different locations and site categories.
A data frame with 1200 observations on the following 3 variables.
A factor identifying the tree by location, site, and tree number.
The age at which the tree was measured.
The bole volume of the tree, in cubic dm.
These data were kindly provided by Professor Boris Zeide, University of Arkanasa, Monticello, AK, USA, and are further documented in Zeide (1993).
A.R. von Guttenberg. 1915. Growth and yield of spruce in Hochgebirge. Franz Deuticke, Wien. (In German)
B. Zeide, 1993. Analysis of growth equations. Forest Science 39 594–616.
Loading required package: MASS Loading required package: lattice
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.