These data were collected during the 1994 planting season in Southwest Washington State.
data(herbdata)A data frame with 961 observations on the following 8 variables.
treatment for control or application
replication
tree number in the replication
date the observation was made
indicator for alive/dead status
height of the tree in cm
basal diameter of the stem, in mm
diameter at breast height, in mm
The plots were installed during the 1994 planting season in southwestern Washington by Don Wallace and Bruce Alber. Three replications of 20 seedlings were planted in two blocks. The two blocks were a control block and a block treated with 220 ml per hectare of Oust herbicide. The plots were then measured over the next ten years. At each observation, the basal diameter, total height, and condition of the stem were recorded. When the stems reached breast height (1.37 m in the United States), the breast height diameter was also recorded. An indicator variable was used to record if the stem was dead or alive. If the stem was dead, the observations were recorded as NA.
Robinson, A.P., and J.D. Hamann. 2010. Forest Analytics with R: an Introduction. Springer.
# NOT RUN {
data(herbdata)
# }
Run the code above in your browser using DataLab