| diamgr {datana} | R Documentation |
Diameter growth of Norway spruce (Picea abies) trees.
Description
von Guttenberg (1915) diameter growth data of Norway spruce trees in the Alps. The data contain measurements of 107 average-size trees from seven locations that encompassed five different sites from healthy, fully stocked stands growing in the Alps. These data are more fully documented in Zeide (1993).
Usage
data(diamgr)
Format
The data frame contains the following columns:
- site
site
- location
location
- tree
Tree number
- age
Total age, in yrs.
- htot
Total height, in m.
- dbh
Diameter at breast height, in cm.
- volume
Total volume, in m
^{3}.- bha
Breast-height age, in yrs.
- tree.id
Tree code, merging site, location and tree number.
Source
Data were provided by Prof. Andrew Robinson, for his Statistical lectures at the University of Idaho (USA), meanwhile Dr Christian Salas-Eljatib was a student there.
References
- von Guttenberg, A. R., 1915. Growth and yield of spruce in Hochgebirge. Franz Deuticke, Vienna (in German). - Zeide, B., 1993. Analysis of growth equations. Forest Science 39 (3), 549-616. doi:10.1093/forestscience/39.3.594
Examples
data(diamgr)
head(diamgr)
library(lattice)
xyplot(dbh ~ age | tree.id, type="b", data=diamgr)