Data</em>, Example 7.5
Cary, NC: SAS Institute.
</p>


<h3>Examples</h3>

<pre><code class='language-R'>data(Vote1980)
fourfold(xtabs(Freq ~ race + votefor + conservatism, 
  data=Vote1980), 
  mfrow=c(2,4))

</code></pre>

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