On this Picostat.com statistics page, you will find information about the sitka89 data set which pertains to Growth of Sitka Spruce Trees. The sitka89 data set is found in the geepack R package. You can load the sitka89 data set in R by issuing the following command at the console data("sitka89"). This will load the data into a variable called sitka89. If R says the sitka89 data set is not found, you can try installing the package by issuing this command install.packages("geepack") and then attempt to reload the data. If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the sitka89 R data set. The size of this file is about 12,943 bytes.

Growth of Sitka Spruce Trees

Description

Impact of ozone on the growth of sitka spruce trees.

Usage

data(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)

--

Dataset imported from https://www.r-project.org.