Sitka89 {MASS}R Documentation

Growth Curves for Sitka Spruce Trees in 1989

Description

The Sitka89 data frame has 632 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 eight times in 1989, at roughly monthly intervals.

Arguments

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"

Format

This data frame contains the following columns:

Source

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

See Also

Sitka


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