Growth of Sitka Spruce Trees

Impact of ozone on the growth of sitka spruce trees.

sitka89

Format

A dataframe

size:

size of the tree measured in \(log(height*diamter^2)\)

time:

days after the 1st january, 1988

tree:

id number of a tree

treat:

ozone: grown under ozone environment, control: ozone free

Examples

data(sitka89)