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<html><head><title>R: Growth Curves for Sitka Spruce Trees in 1988</title>
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<table width="100%" summary="page for Sitka {MASS}"><tr><td>Sitka {MASS}</td><td align="right">R Documentation</td></tr></table>
<h2>Growth Curves for Sitka Spruce Trees in 1988</h2>


<h3>Description</h3>

<p>
The <code>Sitka</code> 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.
</p>


<h3>Usage</h3>

<pre>
Sitka
</pre>


<h3>Format</h3>

<p>
This data frame contains the following columns:
<dl>
<dt><code>size</code></dt><dd>measured size (height times diameter squared) of tree, on log scale
</dd>
<dt><code>Time</code></dt><dd>time of measurement in  days since 1 January 1988
</dd>
<dt><code>tree</code></dt><dd>number of tree
</dd>
<dt><code>treat</code></dt><dd>either <code>"ozone"</code> for an ozone-enriched chamber or <code>"control"</code>
</dd></dl>

<h3>Source</h3>

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


<h3>References</h3>

<p>
Venables, W. N. and Ripley, B. D. (2002)
<EM>Modern Applied Statistics with S.</EM> Fourth edition.  Springer.
</p>


<h3>See Also</h3>

<p>
<code><a href="Sitka89.html">Sitka89</a></code>
</p>



<hr><div align="center">[Package <em>MASS</em> version 7.2-44 <a href="00Index.html">Index]</a></div>

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