| grGrandfir {datana} | R Documentation |
Height and diameter growth of Grand fir (Abies grandis) trees.
Description
Height and diameter growth data of Grand fir (Abies grandis) trees in Idaho, USA. The data contain measurements of 66 dominant trees from national forests in Idaho, USA. These data are fully documented in Stage (1963).
Usage
data(grGrandfir)
Format
The data frame contains the following columns:
- forest
national forest
- forest.id
national forest code
- habtype
habitat type
- hab.id
habitat type code
- tree.id
Tree code
- decade
Decade, as an integer.
- age
Total age, in yrs.
- dbh
Diameter at breast height, in cm.
- htot
Total height, in m.
Source
Data were collected by Dr Albert Stage (R.I.P.), from the US Forest Service in Moscow, Idaho, USA. Data were compiled by Prof. Andrew Robinson, for his Statistical lectures at the University of Idaho (USA), meanwhile Dr Christian Salas-Eljatib was a student there.
References
- Stage, A. R., 1963. A mathematical approach to polymorphic site index curves for Grand fir. Forest Science 9 (2), 167-180. doi:10.1093/forestscience/9.2.167
Examples
data(grGrandfir)
head(grGrandfir)
library(lattice)
xyplot(dbh ~ age | tree.id, type="b", data=grGrandfir)