 each
rootstock.
</p>


<h3>Source</h3>

<p>Andrews, D. and Herzberg, A. (1985). <em>Data: A Collection of
Problems from Many Fields for the Student and Research Worker</em>
Springer-Verlag, pp. 357&ndash;360.
</p>


<h3>References</h3>

<p>Rencher, A. C. (1995). <em>Methods of Multivariate Analysis</em>.
New York: Wiley, Table 6.2
</p>


<h3>Examples</h3>

<pre><code class='language-R'>
library(car)
data(RootStock)
str(RootStock)

root.mod &lt;- lm(cbind(girth4, ext4, girth15, weight15) ~ rootstock, data=R