Sitka {MASS} | R Documentation |
The Sitka
data frame has 395 rows and 4 columns. It gives repeated
measurements on the log-size of 79 Sitka spruce trees, 54 of which
were grown in ozone-enriched chambers and 25 were controls. The size
was measured five times in 1988, at roughly monthly intervals.
size |
measured size (height times diameter squared) of tree, on log scale. |
Time |
time of measurement in days since 1 January 1988 |
tree |
number of tree |
treat |
either "ozone" for an ozone-enriched chamber or "control"
|
This data frame contains the following columns:
P. J. Diggle, K.-Y. Liang and S. L. Zeger (1994) Analysis of Longitudinal Data. Clarendon Press, Oxford