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Name:

Log-size of 79 Sitka spruce trees

Description:

The spruce data frame has 1027 rows and 6 columns. The data consists of measurements on 79 sitka spruce trees over two growing seasons. The trees were grown in four controlled environment chambers, of which the first two, containing 27 trees each, were treated with introduced ozone at 70 ppb whilst the remaining two, containing 12 and 13 trees, were controls.

Variables:

This data frame contains the following columns:

chamber: a numeric vector of chamber numbers
ozone: a factor with levels enriched and normal
id: a numeric vector of tree id
time: a numeric vector of the time when the measurements were taken, measured in days since Jan. 1, 1988
wave: a numeric vector of the measurement number
logsize: a numeric vector of the log-size

Link To Google Sheets:

Rows:

1027

Columns:

Files:

Log-size of 79 Sitka spruce trees_857_71.csv

License Type:

Public Domain (CC0)

References/Notes/Attributions:

Source

Diggle, P.J., Liang, K.Y., and Zeger, S.L. (1994) Analysis of Longitudinal Data, Clarendon Press.

R Dataset Upload:

Use the following R code to directly access this dataset in R.

d <- read.csv("https://www.key2stats.com/Log-size_of_79_Sitka_spruce_trees_857_71.csv")