herbdata {FAwR}

Herbicide trial seedling data

Description

These data were collected during the 1994 planting season in Southwest Washington State.

Usage

data(herbdata)

Format

A data frame with 961 observations on the following 8 variables.

treat

treatment for control or application

rep

replication

tree

tree number in the replication

date

date the observation was made

isalive

indicator for alive/dead status

height

height of the tree in cm

dia

basal diameter of the stem, in mm

dbh

diameter at breast height, in mm

Details

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.

Source

The data are provided courtesy of Don Wallace and Bruce Alber of the Wilbur-Ellis Company.

References

Robinson, A.P., and J.D. Hamann. 2010. Forest Analytics with R: an Introduction. Springer.

Examples

data(herbdata)