s)</span>
<span id="cb3-30"><a href="#cb3-30"></a><span class="kw">str</span>(breast)</span>
<span id="cb3-31"><a href="#cb3-31"></a><span class="co">#&gt; &#39;data.frame&#39;:    683 obs. of  10 variables:</span></span>
<span id="cb3-32"><a href="#cb3-32"></a><span class="co">#&gt;  $ Cl.thickness   : Ord.factor w/ 10 levels &quot;1&quot;&lt;&quot;2&quot;&lt;&quot;3&quot;&lt;&quot;4&quot;&lt;..: 5 5 3 6 4 8 1 2 2 4 ...</span></span>
<span id="cb3-33"><a href="#cb3-33"></a><span class="co">#&gt;  $ Cell.si