e>VONA</code> 
</p>
</dd>
<dt>yield</dt><dd>
<p>a numeric vector
</p>
</dd>
<dt>latitude</dt><dd>
<p>a numeric vector
</p>
</dd>
<dt>longitude</dt><dd>
<p>a numeric vector
</p>
</dd>
</dl>



<h3>Source</h3>

<p>Pinheiro, J. C. and Bates, D. M. (2000), <em>Mixed-Effects Models in S
and S-PLUS</em>, Springer, New York.
</p>

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